muen/linux.git
7 weeks agoLinux 5.9-rc8 master v5.9-rc8
Linus Torvalds [Sun, 4 Oct 2020 23:04:34 +0000 (16:04 -0700)]
Linux 5.9-rc8

7 weeks agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Sat, 3 Oct 2020 19:19:23 +0000 (12:19 -0700)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:
 "Two bugfixes"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: VMX: update PFEC_MASK/PFEC_MATCH together with PF intercept
  KVM: arm64: Restore missing ISB on nVHE __tlb_switch_to_guest

7 weeks agoMerge tag 'for-linus-5.9b-rc8-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 3 Oct 2020 18:57:39 +0000 (11:57 -0700)]
Merge tag 'for-linus-5.9b-rc8-tag' of git://git./linux/kernel/git/xen/tip

Pull xen fix from Juergen Gross:
 "Fix a regression introduced in 5.9-rc3 which caused a system running
  as fully virtualized guest under Xen to crash when using legacy
  devices like a floppy"

* tag 'for-linus-5.9b-rc8-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/events: don't use chip_data for legacy IRQs

7 weeks agoMerge tag 'usb-5.9-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Sat, 3 Oct 2020 18:47:35 +0000 (11:47 -0700)]
Merge tag 'usb-5.9-rc8' of git://git./linux/kernel/git/gregkh/usb

Pull USB/PHY fixes from Greg KH:
 "Here are some small USB and PHY driver fixes for 5.9-rc8

  The PHY driver fix resolves an issue found by Dan Carpenter for a
  memory leak.

  The USB fixes fall into two groups:

   - usb gadget fix from Bryan that is a fix for a previous security fix
     that showed up in in-the-wild testing

   - usb core driver matching bugfixes. This fixes a bug that has
     plagued the both the usbip driver and syzbot testing tools this -rc
     release cycle. All is now working properly so usbip connections
     will work, and syzbot can get back to fuzzing USB drivers properly.

  All have been in linux-next for a while with no reported issues"

* tag 'usb-5.9-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  usbcore/driver: Accommodate usbip
  usbcore/driver: Fix incorrect downcast
  usbcore/driver: Fix specific driver selection
  Revert "usbip: Implement a match function to fix usbip"
  USB: gadget: f_ncm: Fix NDP16 datagram validation
  phy: ti: am654: Fix a leak in serdes_am654_probe()

7 weeks agoMerge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
Linus Torvalds [Sat, 3 Oct 2020 18:40:22 +0000 (11:40 -0700)]
Merge branch 'i2c/for-current' of git://git./linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
 "Some more driver fixes for i2c"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: npcm7xx: Clear LAST bit after a failed transaction.
  i2c: cpm: Fix i2c_ram structure
  i2c: i801: Exclude device from suspend direct complete optimization

7 weeks agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Linus Torvalds [Sat, 3 Oct 2020 18:37:23 +0000 (11:37 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/dtor/input

Pull input fixes from Dmitry Torokhov:
 "A couple more driver quirks, now enabling newer trackpoints from
  Synaptics for real"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: i8042 - add nopnp quirk for Acer Aspire 5 A515
  Input: trackpoint - enable Synaptics trackpoints

7 weeks agoscripts/spelling.txt: fix malformed entry
Eric Biggers [Sat, 3 Oct 2020 05:21:48 +0000 (22:21 -0700)]
scripts/spelling.txt: fix malformed entry

One of the entries has three fields "mistake||correction||correction"
rather than the expected two fields "mistake||correction".  Fix it.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: https://lkml.kernel.org/r/20200930234359.255295-1-ebiggers@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 weeks agomm/page_alloc: handle a missing case for memalloc_nocma_{save/restore} APIs
Joonsoo Kim [Sat, 3 Oct 2020 05:21:45 +0000 (22:21 -0700)]
mm/page_alloc: handle a missing case for memalloc_nocma_{save/restore} APIs

memalloc_nocma_{save/restore} APIs can be used to skip page allocation
on CMA area, but, there is a missing case and the page on CMA area could
be allocated even if APIs are used.  This patch handles this case to fix
the potential issue.

For now, these APIs are used to prevent long-term pinning on the CMA
page.  When the long-term pinning is requested on the CMA page, it is
migrated to the non-CMA page before pinning.  This non-CMA page is
allocated by using memalloc_nocma_{save/restore} APIs.  If APIs doesn't
work as intended, the CMA page is allocated and it is pinned for a long
time.  This long-term pin for the CMA page causes cma_alloc() failure
and it could result in wrong behaviour on the device driver who uses the
cma_alloc().

Missing case is an allocation from the pcplist.  MIGRATE_MOVABLE pcplist
could have the pages on CMA area so we need to skip it if ALLOC_CMA
isn't specified.

Fixes: 8510e69c8efe (mm/page_alloc: fix memalloc_nocma_{save/restore} APIs)
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Link: https://lkml.kernel.org/r/1601429472-12599-1-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 weeks agomm, slub: restore initial kmem_cache flags
Eric Farman [Sat, 3 Oct 2020 05:21:41 +0000 (22:21 -0700)]
mm, slub: restore initial kmem_cache flags

The routine that applies debug flags to the kmem_cache slabs
inadvertantly prevents non-debug flags from being applied to those
same objects.  That is, if slub_debug=<flag>,<slab> is specified,
non-debugged slabs will end up having flags of zero, and the slabs
may be unusable.

Fix this by including the input flags for non-matching slabs with the
contents of slub_debug, so that the caches are created as expected
alongside any debugging options that may be requested.  With this, we
can remove the check for a NULL slub_debug_string, since it's covered
by the loop itself.

Fixes: e17f1dfba37b ("mm, slub: extend slub_debug syntax for multiple blocks")
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Kees Cook <keescook@chromium.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Link: https://lkml.kernel.org/r/20200930161931.28575-1-farman@linux.ibm.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 weeks agoMerge tag 'kvmarm-fixes-5.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmar...
Paolo Bonzini [Sat, 3 Oct 2020 09:07:59 +0000 (05:07 -0400)]
Merge tag 'kvmarm-fixes-5.9-3' of git://git./linux/kernel/git/kvmarm/kvmarm into kvm-master

KVM/arm64 fixes for 5.9, take #3

- Fix synchronization of VTTBR update on TLB invalidation for nVHE systems

7 weeks agoKVM: VMX: update PFEC_MASK/PFEC_MATCH together with PF intercept
Paolo Bonzini [Tue, 29 Sep 2020 12:31:32 +0000 (08:31 -0400)]
KVM: VMX: update PFEC_MASK/PFEC_MATCH together with PF intercept

The PFEC_MASK and PFEC_MATCH fields in the VMCS reverse the meaning of
the #PF intercept bit in the exception bitmap when they do not match.
This means that, if PFEC_MASK and/or PFEC_MATCH are set, the
hypervisor can get a vmexit for #PF exceptions even when the
corresponding bit is clear in the exception bitmap.

This is unexpected and is promptly detected by a WARN_ON_ONCE.
To fix it, reset PFEC_MASK and PFEC_MATCH when the #PF intercept
is disabled (as is common with enable_ept && !allow_smaller_maxphyaddr).

Reported-by: Qian Cai <cai@redhat.com>>
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
7 weeks agoMerge tag 'pinctrl-v5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
Linus Torvalds [Fri, 2 Oct 2020 21:51:34 +0000 (14:51 -0700)]
Merge tag 'pinctrl-v5.9-2' of git://git./linux/kernel/git/linusw/linux-pinctrl

Pull pin control fixes from Linus Walleij:
 "Some pin control fixes here. All of them are driver fixes, the Intel
  Cherryview being the most interesting one.

   - Fix a mux problem for I2C in the MVEBU driver.

   - Fix a really hairy inversion problem in the Intel Cherryview
     driver.

   - Fix the register for the sdc2_clk in the Qualcomm SM8250 driver.

   - Check the virtual GPIO boot failur in the Mediatek driver"

* tag 'pinctrl-v5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
  pinctrl: mediatek: check mtk_is_virt_gpio input parameter
  pinctrl: qcom: sm8250: correct sdc2_clk
  pinctrl: cherryview: Preserve CHV_PADCTRL1_INVRXTX_TXDATA flag on GPIOs
  pinctrl: mvebu: Fix i2c sda definition for 98DX3236

7 weeks agoMerge tag 'pci-v5.9-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Linus Torvalds [Fri, 2 Oct 2020 21:48:25 +0000 (14:48 -0700)]
Merge tag 'pci-v5.9-fixes-2' of git://git./linux/kernel/git/helgaas/pci

Pull PCI fixes from Bjorn Helgaas:

 - Fix rockchip regression in rockchip_pcie_valid_device() (Lorenzo
   Pieralisi)

 - Add Pali Rohár as aardvark PCI maintainer (Pali Rohár)

* tag 'pci-v5.9-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  MAINTAINERS: Add Pali Rohár as aardvark PCI maintainer
  PCI: rockchip: Fix bus checks in rockchip_pcie_valid_device()

7 weeks agoMerge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Linus Torvalds [Fri, 2 Oct 2020 21:42:13 +0000 (14:42 -0700)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "Two patches in driver frameworks. The iscsi one corrects a bug induced
  by a BPF change to network locking and the other is a regression we
  introduced"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: iscsi: iscsi_tcp: Avoid holding spinlock while calling getpeername()
  scsi: target: Fix lun lookup for TARGET_SCF_LOOKUP_LUN_FROM_TAG case

7 weeks agoMerge tag 'io_uring-5.9-2020-10-02' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 2 Oct 2020 21:38:10 +0000 (14:38 -0700)]
Merge tag 'io_uring-5.9-2020-10-02' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:

 - fix for async buffered reads if read-ahead is fully disabled (Hao)

 - double poll match fix

 - ->show_fdinfo() potential ABBA deadlock complaint fix

* tag 'io_uring-5.9-2020-10-02' of git://git.kernel.dk/linux-block:
  io_uring: fix async buffered reads when readahead is disabled
  io_uring: fix potential ABBA deadlock in ->show_fdinfo()
  io_uring: always delete double poll wait entry on match

7 weeks agoMerge tag 'block-5.9-2020-10-02' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 2 Oct 2020 21:34:52 +0000 (14:34 -0700)]
Merge tag 'block-5.9-2020-10-02' of git://git.kernel.dk/linux-block

Pull block fix from Jens Axboe:
 "Single fix for a ->commit_rqs failure case"

* tag 'block-5.9-2020-10-02' of git://git.kernel.dk/linux-block:
  blk-mq: call commit_rqs while list empty but error happen

7 weeks agoMerge branch 'work.epoll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Linus Torvalds [Fri, 2 Oct 2020 17:37:08 +0000 (10:37 -0700)]
Merge branch 'work.epoll' of git://git./linux/kernel/git/viro/vfs

Pull epoll fixes from Al Viro:
 "Several race fixes in epoll"

* 'work.epoll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  ep_create_wakeup_source(): dentry name can change under you...
  epoll: EPOLL_CTL_ADD: close the race in decision to take fast path
  epoll: replace ->visited/visited_list with generation count
  epoll: do not insert into poll queues until all sanity checks are done

7 weeks agoMerge tag 'riscv-for-linus-5.9-rc8' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 2 Oct 2020 17:13:05 +0000 (10:13 -0700)]
Merge tag 'riscv-for-linus-5.9-rc8' of git://git./linux/kernel/git/riscv/linux

Pull RISC-V fixes from Palmer Dabbelt:
 "Two fixes for this week:

   - The addition of a symbol export for clint_time_val, which has been
     inlined into some timex functions and can be used by drivers.

   - A fix to avoid calling get_cycles() before the timers have been
     probed.

  These both only effect !MMU systems"

* tag 'riscv-for-linus-5.9-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  RISC-V: Check clint_time_val before use
  clocksource: clint: Export clint_time_val for modules

7 weeks agoMerge tag 'for-5.9-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
Linus Torvalds [Fri, 2 Oct 2020 17:09:40 +0000 (10:09 -0700)]
Merge tag 'for-5.9-rc7-tag' of git://git./linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:
 "Two more fixes.

  One is for a lockdep warning/lockup (also caught by syzbot), that one
  has been seen in practice. Regarding the other syzbot reports
  mentioned last time, they don't seem to be urgent and reliably
  reproducible so they'll be fixed later.

  The second fix is for a potential corruption when device replace
  finishes and the in-memory state of trim is not copied to the new
  device"

* tag 'for-5.9-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: fix filesystem corruption after a device replace
  btrfs: move btrfs_rm_dev_replace_free_srcdev outside of all locks
  btrfs: move btrfs_scratch_superblocks into btrfs_dev_replace_finishing

7 weeks agoMerge tag 'pm-5.9-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Linus Torvalds [Fri, 2 Oct 2020 17:05:56 +0000 (10:05 -0700)]
Merge tag 'pm-5.9-rc8' of git://git./linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix one more issue related to the recent RCU-lockdep changes, a
  typo in documentation and add a missing return statement to
  intel_pstate.

  Specifics:

   - Fix up RCU usage for cpuidle on the ARM imx6q platform (Ulf
     Hansson)

   - Fix typo in the PM documentation (Yoann Congal)

   - Add return statement that is missing after recent changes in the
     intel_pstate driver (Zhang Rui)"

* tag 'pm-5.9-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ARM: imx6q: Fixup RCU usage for cpuidle
  Documentation: PM: Fix a reStructuredText syntax error
  cpufreq: intel_pstate: Fix missing return statement

7 weeks agoMerge tag 'staging-5.9-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Fri, 2 Oct 2020 17:01:00 +0000 (10:01 -0700)]
Merge tag 'staging-5.9-rc8' of git://git./linux/kernel/git/gregkh/staging

Pull IIO fixes from Greg KH:
 "Here are two small IIO driver fixes for 5.9-rc8 that resolve some
  reported issues:

   - driver name fixed in one driver

   - device name typo fixed

  Both have been in linux-next for a while with no reported problems"

* tag 'staging-5.9-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  iio: adc: qcom-spmi-adc5: fix driver name
  iio: adc: ad7124: Fix typo in device name

7 weeks agoMerge tag 'gpio-v5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux...
Linus Torvalds [Fri, 2 Oct 2020 16:51:42 +0000 (09:51 -0700)]
Merge tag 'gpio-v5.9-2' of git://git./linux/kernel/git/linusw/linux-gpio

Pull GPIO fixes from Linus Walleij:
 "Some late GPIO fixes for the v5.9 series:

   - Fix compiler warnings on the OMAP when PM is disabled

   - Clear the interrupt when setting edge sensitivity on the Spreadtrum
     driver.

   - Fix up spurious interrupts on the TC35894.

   - Support threaded interrupts on the Siox controller.

   - Fix resource leaks on the mockup driver.

   - Fix line event handling in syscall compatible mode for the
     character device.

   - Fix an unitialized variable in the PCA953A driver.

   - Fix access to all GPIO IRQs on the Aspeed AST2600.

   - Fix line direction on the AMD FCH driver.

   - Use the bitmap API instead of compiler intrinsics for bit
     manipulation in the PCA953x driver"

* tag 'gpio-v5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: pca953x: Correctly initialize registers 6 and 7 for PCA957x
  gpio: pca953x: Use bitmap API over implicit GCC extension
  gpio: amd-fch: correct logic of GPIO_LINE_DIRECTION
  gpio: aspeed: fix ast2600 bank properties
  gpio/aspeed-sgpio: don't enable all interrupts by default
  gpio/aspeed-sgpio: enable access to all 80 input & output sgpios
  gpio: pca953x: Fix uninitialized pending variable
  gpiolib: Fix line event handling in syscall compatible mode
  gpio: mockup: fix resource leak in error path
  gpio: siox: explicitly support only threaded irqs
  gpio: tc35894: fix up tc35894 interrupt configuration
  gpio: sprd: Clear interrupt when setting the type as edge
  gpio: omap: Fix warnings if PM is disabled

7 weeks agoMerge tag 'mmc-v5.9-rc4-3' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
Linus Torvalds [Fri, 2 Oct 2020 16:40:09 +0000 (09:40 -0700)]
Merge tag 'mmc-v5.9-rc4-3' of git://git./linux/kernel/git/ulfh/mmc

Pull MMC fixes from Ulf Hansson:

 - Fix deadlock when removing MEMSTICK host

 - Workaround broken CMDQ on Intel GLK based IRBIS models

* tag 'mmc-v5.9-rc4-3' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
  mmc: sdhci: Workaround broken command queuing on Intel GLK based IRBIS models
  memstick: Skip allocating card when removing host

7 weeks agorandom32: Restore __latent_entropy attribute on net_rand_state
Thibaut Sautereau [Fri, 2 Oct 2020 15:16:11 +0000 (17:16 +0200)]
random32: Restore __latent_entropy attribute on net_rand_state

Commit f227e3ec3b5c ("random32: update the net random state on interrupt
and activity") broke compilation and was temporarily fixed by Linus in
83bdc7275e62 ("random32: remove net_rand_state from the latent entropy
gcc plugin") by entirely moving net_rand_state out of the things handled
by the latent_entropy GCC plugin.

From what I understand when reading the plugin code, using the
__latent_entropy attribute on a declaration was the wrong part and
simply keeping the __latent_entropy attribute on the variable definition
was the correct fix.

Fixes: 83bdc7275e62 ("random32: remove net_rand_state from the latent entropy gcc plugin")
Acked-by: Willy Tarreau <w@1wt.eu>
Cc: Emese Revfy <re.emese@gmail.com>
Signed-off-by: Thibaut Sautereau <thibaut.sautereau@ssi.gouv.fr>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 weeks agoMerge branch 'pm-cpufreq'
Rafael J. Wysocki [Fri, 2 Oct 2020 16:30:30 +0000 (18:30 +0200)]
Merge branch 'pm-cpufreq'

* pm-cpufreq:
  cpufreq: intel_pstate: Fix missing return statement

7 weeks agomm: memcg/slab: fix slab statistics in !SMP configuration
Roman Gushchin [Thu, 1 Oct 2020 20:07:49 +0000 (13:07 -0700)]
mm: memcg/slab: fix slab statistics in !SMP configuration

Since commit ea426c2a7de8 ("mm: memcg: prepare for byte-sized vmstat
items") the write side of slab counters accepts a value in bytes and
converts it to pages.  It happens in __mod_node_page_state().

However a non-SMP version of __mod_node_page_state() doesn't perform
this conversion.  It leads to incorrect (unrealistically high) slab
counters values.  Fix this by adding a similar conversion to the non-SMP
version of __mod_node_page_state().

Signed-off-by: Roman Gushchin <guro@fb.com>
Reported-and-tested-by: Bastian Bittorf <bb@npl.de>
Fixes: ea426c2a7de8 ("mm: memcg: prepare for byte-sized vmstat items")
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 weeks agopipe: remove pipe_wait() and fix wakeup race with splice
Linus Torvalds [Fri, 2 Oct 2020 02:14:36 +0000 (19:14 -0700)]
pipe: remove pipe_wait() and fix wakeup race with splice

The pipe splice code still used the old model of waiting for pipe IO by
using a non-specific "pipe_wait()" that waited for any pipe event to
happen, which depended on all pipe IO being entirely serialized by the
pipe lock.  So by checking the state you were waiting for, and then
adding yourself to the wait queue before dropping the lock, you were
guaranteed to see all the wakeups.

Strictly speaking, the actual wakeups were not done under the lock, but
the pipe_wait() model still worked, because since the waiter held the
lock when checking whether it should sleep, it would always see the
current state, and the wakeup was always done after updating the state.

However, commit 0ddad21d3e99 ("pipe: use exclusive waits when reading or
writing") split the single wait-queue into two, and in the process also
made the "wait for event" code wait for _two_ wait queues, and that then
showed a race with the wakers that were not serialized by the pipe lock.

It's only splice that used that "pipe_wait()" model, so the problem
wasn't obvious, but Josef Bacik reports:

 "I hit a hang with fstest btrfs/187, which does a btrfs send into
  /dev/null. This works by creating a pipe, the write side is given to
  the kernel to write into, and the read side is handed to a thread that
  splices into a file, in this case /dev/null.

  The box that was hung had the write side stuck here [pipe_write] and
  the read side stuck here [splice_from_pipe_next -> pipe_wait].

  [ more details about pipe_wait() scenario ]

  The problem is we're doing the prepare_to_wait, which sets our state
  each time, however we can be woken up either with reads or writes. In
  the case above we race with the WRITER waking us up, and re-set our
  state to INTERRUPTIBLE, and thus never break out of schedule"

Josef had a patch that avoided the issue in pipe_wait() by just making
it set the state only once, but the deeper problem is that pipe_wait()
depends on a level of synchonization by the pipe mutex that it really
shouldn't.  And the whole "wait for any pipe state change" model really
isn't very good to begin with.

So rather than trying to work around things in pipe_wait(), remove that
legacy model of "wait for arbitrary pipe event" entirely, and actually
create functions that wait for the pipe actually being readable or
writable, and can do so without depending on the pipe lock serializing
everything.

Fixes: 0ddad21d3e99 ("pipe: use exclusive waits when reading or writing")
Link: https://lore.kernel.org/linux-fsdevel/bfa88b5ad6f069b2b679316b9e495a970130416c.1601567868.git.josef@toxicpanda.com/
Reported-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-and-tested-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 weeks agoMerge tag 'iommu-fixes-v5.9-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Thu, 1 Oct 2020 19:59:36 +0000 (12:59 -0700)]
Merge tag 'iommu-fixes-v5.9-rc7' of git://git./linux/kernel/git/joro/iommu

Pull iommu fixes from Joerg Roedel:

 - Fix a device reference counting bug in the Exynos IOMMU driver.

 - Lockdep fix for the Intel VT-d driver.

 - Fix a bug in the AMD IOMMU driver which caused corruption of the IVRS
   ACPI table and caused IOMMU driver initialization failures in kdump
   kernels.

* tag 'iommu-fixes-v5.9-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/vt-d: Fix lockdep splat in iommu_flush_dev_iotlb()
  iommu/amd: Fix the overwritten field in IVMD header
  iommu/exynos: add missing put_device() call in exynos_iommu_of_xlate()

7 weeks agoMerge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Linus Torvalds [Thu, 1 Oct 2020 18:49:01 +0000 (11:49 -0700)]
Merge tag 'arm64-fixes' of git://git./linux/kernel/git/arm64/linux

Pull arm64 fix from Catalin Marinas:
 "A previous commit to prevent AML memory opregions from accessing the
  kernel memory turned out to be too restrictive. Relax the permission
  check to permit the ACPI core to map kernel memory used for table
  overrides"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: permit ACPI core to map kernel memory used for table overrides

7 weeks agoMerge tag 'drm-fixes-2020-10-01-1' of git://anongit.freedesktop.org/drm/drm
Linus Torvalds [Thu, 1 Oct 2020 16:45:37 +0000 (09:45 -0700)]
Merge tag 'drm-fixes-2020-10-01-1' of git://anongit.freedesktop.org/drm/drm

Pull drm fixes from Dave Airlie:
 "AMD and vmwgfx fixes.

  Just dequeuing these a bit early as the AMD ones are bit larger than
  I'd prefer, but Alex missed last week so it's a double set of fixes.
  The larger ones are just register header fixes for the new chips that
  were just introduced in rc1 along with some new PCI IDs for new hw.
  Otherwise it is usual fixes.

  The vmwgfx fix was due to some testing I was doing and found we
  weren't booting properly, vmware had the fix internally so hurried it

  vmwgfx:
   - fix a regression due to TTM refactor

  amdgpu:
   - Fix potential double free in userptr handling
   - Sienna Cichlid and Navy Flounder udpates
   - Add Sienna Cichlid PCI IDs
   - Drop experimental flag for navi12
   - Raven fixes
   - Renoir fixes
   - HDCP fix
   - DCN3 fix for clang and older versions of gcc
   - Fix a runtime pm refcount issue"

* tag 'drm-fixes-2020-10-01-1' of git://anongit.freedesktop.org/drm/drm:
  drm/amdgpu: disable gfxoff temporarily for navy_flounder
  drm/amd/pm: setup APU dpm clock table in SMU HW initialization
  drm/vmwgfx: Fix error handling in get_node
  drm/amd/display: remove duplicate call to rn_vbios_smu_get_smu_version()
  drm/amdgpu/swsmu/smu12: fix force clock handling for mclk
  drm/amdgpu: restore proper ref count in amdgpu_display_crtc_set_config
  drm/amdgpu/display: fix CFLAGS setup for DCN30
  drm/amd/display: fix return value check for hdcp_work
  drm/amdgpu: remove gpu_info fw support for sienna_cichlid etc.
  drm/amd/pm: Removed fixed clock in auto mode DPM
  drm/amdgpu: remove experimental flag from navi12
  drm/amdgpu: add device ID for sienna_cichlid (v2)
  drm/amdgpu: use the AV1 defines for VCN 3.0
  drm/amdgpu: add VCN 3.0 AV1 registers
  drm/amdgpu: add the GC 10.3 VRS registers
  drm/amdgpu: prevent double kfree ttm->sg

7 weeks agoMerge tag 'trace-v5.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
Linus Torvalds [Thu, 1 Oct 2020 16:41:02 +0000 (09:41 -0700)]
Merge tag 'trace-v5.9-rc6' of git://git./linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:
 "Two tracing fixes:

   - Fix temp buffer accounting that caused a WARNING for
     ftrace_dump_on_opps()

   - Move the recursion check in one of the function callback helpers to
     the beginning of the function, as if the rcu_is_watching() gets
     traced, it will cause a recursive loop that will crash the kernel"

* tag 'trace-v5.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  ftrace: Move RCU is watching check after recursion check
  tracing: Fix trace_find_next_entry() accounting of temp buffer size

7 weeks agoiommu/vt-d: Fix lockdep splat in iommu_flush_dev_iotlb()
Lu Baolu [Sun, 27 Sep 2020 06:24:28 +0000 (14:24 +0800)]
iommu/vt-d: Fix lockdep splat in iommu_flush_dev_iotlb()

Lock(&iommu->lock) without disabling irq causes lockdep warnings.

[   12.703950] ========================================================
[   12.703962] WARNING: possible irq lock inversion dependency detected
[   12.703975] 5.9.0-rc6+ #659 Not tainted
[   12.703983] --------------------------------------------------------
[   12.703995] systemd-udevd/284 just changed the state of lock:
[   12.704007] ffffffffbd6ff4d8 (device_domain_lock){..-.}-{2:2}, at:
               iommu_flush_dev_iotlb.part.57+0x2e/0x90
[   12.704031] but this lock took another, SOFTIRQ-unsafe lock in the past:
[   12.704043]  (&iommu->lock){+.+.}-{2:2}
[   12.704045]

               and interrupts could create inverse lock ordering between
               them.

[   12.704073]
               other info that might help us debug this:
[   12.704085]  Possible interrupt unsafe locking scenario:

[   12.704097]        CPU0                    CPU1
[   12.704106]        ----                    ----
[   12.704115]   lock(&iommu->lock);
[   12.704123]                                local_irq_disable();
[   12.704134]                                lock(device_domain_lock);
[   12.704146]                                lock(&iommu->lock);
[   12.704158]   <Interrupt>
[   12.704164]     lock(device_domain_lock);
[   12.704174]
                *** DEADLOCK ***

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20200927062428.13713-1-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
7 weeks agoxen/events: don't use chip_data for legacy IRQs
Juergen Gross [Wed, 30 Sep 2020 09:16:14 +0000 (11:16 +0200)]
xen/events: don't use chip_data for legacy IRQs

Since commit c330fb1ddc0a ("XEN uses irqdesc::irq_data_common::handler_data to store a per interrupt XEN data pointer which contains XEN specific information.")
Xen is using the chip_data pointer for storing IRQ specific data. When
running as a HVM domain this can result in problems for legacy IRQs, as
those might use chip_data for their own purposes.

Use a local array for this purpose in case of legacy IRQs, avoiding the
double use.

Cc: stable@vger.kernel.org
Fixes: c330fb1ddc0a ("XEN uses irqdesc::irq_data_common::handler_data to store a per interrupt XEN data pointer which contains XEN specific information.")
Signed-off-by: Juergen Gross <jgross@suse.com>
Tested-by: Stefan Bader <stefan.bader@canonical.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20200930091614.13660-1-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
7 weeks agoiommu/amd: Fix the overwritten field in IVMD header
Adrian Huang [Sat, 26 Sep 2020 10:26:02 +0000 (18:26 +0800)]
iommu/amd: Fix the overwritten field in IVMD header

Commit 387caf0b759a ("iommu/amd: Treat per-device exclusion
ranges as r/w unity-mapped regions") accidentally overwrites
the 'flags' field in IVMD (struct ivmd_header) when the I/O
virtualization memory definition is associated with the
exclusion range entry. This leads to the corrupted IVMD table
(incorrect checksum). The kdump kernel reports the invalid checksum:

ACPI BIOS Warning (bug): Incorrect checksum in table [IVRS] - 0x5C, should be 0x60 (20200717/tbprint-177)
AMD-Vi: [Firmware Bug]: IVRS invalid checksum

Fix the above-mentioned issue by modifying the 'struct unity_map_entry'
member instead of the IVMD header.

Cleanup: The *exclusion_range* functions are not used anymore, so
get rid of them.

Fixes: 387caf0b759a ("iommu/amd: Treat per-device exclusion ranges as r/w unity-mapped regions")
Reported-and-tested-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Adrian Huang <ahuang12@lenovo.com>
Cc: Jerry Snitselaar <jsnitsel@redhat.com>
Link: https://lore.kernel.org/r/20200926102602.19177-1-adrianhuang0701@gmail.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
7 weeks agoKVM: arm64: Restore missing ISB on nVHE __tlb_switch_to_guest
Marc Zyngier [Mon, 13 Jul 2020 14:15:14 +0000 (15:15 +0100)]
KVM: arm64: Restore missing ISB on nVHE __tlb_switch_to_guest

Commit a0e50aa3f4a8 ("KVM: arm64: Factor out stage 2 page table
data from struct kvm") dropped the ISB after __load_guest_stage2(),
only leaving the one that is required when the speculative AT
workaround is in effect.

As Andrew points it: "This alternative is 'backwards' to avoid a
double ISB as there is one in __load_guest_stage2 when the workaround
is active."

Restore the missing ISB, conditionned on the AT workaround not being
active.

Fixes: a0e50aa3f4a8 ("KVM: arm64: Factor out stage 2 page table data from struct kvm")
Reported-by: Andrew Scull <ascull@google.com>
Reported-by: Thomas Tai <thomas.tai@oracle.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
7 weeks agogpio: pca953x: Correctly initialize registers 6 and 7 for PCA957x
Andy Shevchenko [Wed, 30 Sep 2020 14:20:13 +0000 (17:20 +0300)]
gpio: pca953x: Correctly initialize registers 6 and 7 for PCA957x

When driver has been converted to the bitmap API the non-bitmap functions
started behaving differently on 32-bit BE architectures since the bytes in
two consequent unsigned longs are in different order in comparison to byte
array. Hence if the chip had had more than 32 lines the memset() call over
it would have not set up upper lines correctly.
Although it's currently a theoretical case (no supported chips of this type
has 32+ lines), it's better to provide a clean code to avoid people thinking
this is okay and potentially producing not fully working things.

Fixes: 35d13d94893f ("gpio: pca953x: convert to use bitmap API")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Link: https://lore.kernel.org/r/20200930142013.59247-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
7 weeks agogpio: pca953x: Use bitmap API over implicit GCC extension
Andy Shevchenko [Wed, 30 Sep 2020 14:20:12 +0000 (17:20 +0300)]
gpio: pca953x: Use bitmap API over implicit GCC extension

In IRQ handler we have to clear bitmap before use. Currently
the GCC extension has been used for that. For sake of the consistency
switch to bitmap API. As expected bloat-o-meter shows no difference
in the object size.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Link: https://lore.kernel.org/r/20200930142013.59247-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
7 weeks agopinctrl: mediatek: check mtk_is_virt_gpio input parameter
Hanks Chen [Thu, 20 Aug 2020 11:22:25 +0000 (19:22 +0800)]
pinctrl: mediatek: check mtk_is_virt_gpio input parameter

check mtk_is_virt_gpio input parameter,
virtual gpio need to support eint mode.

add error handler for the ko case
to fix this boot fail:
pc : mtk_is_virt_gpio+0x20/0x38 [pinctrl_mtk_common_v2]
lr : mtk_gpio_get_direction+0x44/0xb0 [pinctrl_paris]

Fixes: edd546465002 ("pinctrl: mediatek: avoid virtual gpio trying to set reg")
Signed-off-by: Hanks Chen <hanks.chen@mediatek.com>
Acked-by: Sean Wang <sean.wang@kernel.org>
Singed-off-by: Jie Yang <sin_jieyang@mediatek.com>
Link: https://lore.kernel.org/r/1597922546-29633-1-git-send-email-hanks.chen@mediatek.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
7 weeks agopinctrl: qcom: sm8250: correct sdc2_clk
Dmitry Baryshkov [Mon, 14 Sep 2020 09:18:46 +0000 (12:18 +0300)]
pinctrl: qcom: sm8250: correct sdc2_clk

Correct sdc2_clk pin definition (register offset is wrong, verified by
the msm-4.19 driver).

Fixes: 4e3ec9e407ad ("pinctrl: qcom: Add sm8250 pinctrl driver.")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200914091846.55204-1-dmitry.baryshkov@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
7 weeks agoMerge tag 'amd-drm-fixes-5.9-2020-09-30' of git://people.freedesktop.org/~agd5f/linux...
Dave Airlie [Thu, 1 Oct 2020 05:25:32 +0000 (15:25 +1000)]
Merge tag 'amd-drm-fixes-5.9-2020-09-30' of git://people.freedesktop.org/~agd5f/linux into drm-fixes

amd-drm-fixes-5.9-2020-09-30:

amdgpu:
- Fix potential double free in userptr handling
- Sienna Cichlid and Navy Flounder udpates
- Add Sienna Cichlid PCI IDs
- Drop experimental flag for navi12
- Raven fixes
- Renoir fixes
- HDCP fix
- DCN3 fix for clang and older versions of gcc
- Fix a runtime pm refcount issue

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Alex Deucher <alexdeucher@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200930161326.4243-1-alexander.deucher@amd.com
7 weeks agoMAINTAINERS: Add Pali Rohár as aardvark PCI maintainer
Pali Rohár [Fri, 25 Sep 2020 09:21:15 +0000 (11:21 +0200)]
MAINTAINERS: Add Pali Rohár as aardvark PCI maintainer

Link: https://lore.kernel.org/r/20200925092115.16546-1-pali@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Thomas Petazzzoni <thomas.petazzoni@bootlin.com>
7 weeks agoarm64: permit ACPI core to map kernel memory used for table overrides
Ard Biesheuvel [Tue, 29 Sep 2020 13:25:22 +0000 (15:25 +0200)]
arm64: permit ACPI core to map kernel memory used for table overrides

Jonathan reports that the strict policy for memory mapped by the
ACPI core breaks the use case of passing ACPI table overrides via
initramfs. This is due to the fact that the memory type used for
loading the initramfs in memory is not recognized as a memory type
that is typically used by firmware to pass firmware tables.

Since the purpose of the strict policy is to ensure that no AML or
other ACPI code can manipulate any memory that is used by the kernel
to keep its internal state or the state of user tasks, we can relax
the permission check, and allow mappings of memory that is reserved
and marked as NOMAP via memblock, and therefore not covered by the
linear mapping to begin with.

Fixes: 1583052d111f ("arm64/acpi: disallow AML memory opregions to access kernel memory")
Fixes: 325f5585ec36 ("arm64/acpi: disallow writeable AML opregion mapping for EFI code regions")
Reported-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Link: https://lore.kernel.org/r/20200929132522.18067-1-ardb@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
7 weeks agoMerge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Wed, 30 Sep 2020 21:18:38 +0000 (14:18 -0700)]
Merge tag 'clk-fixes-for-linus' of git://git./linux/kernel/git/clk/linux

Pull clk fixes from Stephen Boyd:
 "Another batch of clk driver fixes:

   - Make sure DRAM and ChipID region doesn't get disabled on Exynos

   - Fix a SATA failure on Tegra

   - Fix the emac_ptp clk divider on stratix10"

* tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
  clk: socfpga: stratix10: fix the divider for the emac_ptp_free_clk
  clk: samsung: exynos4: mark 'chipid' clock as CLK_IGNORE_UNUSED
  clk: tegra: Fix missing prototype for tegra210_clk_register_emc()
  clk: tegra: Always program PLL_E when enabled
  clk: tegra: Capitalization fixes
  clk: samsung: Keep top BPLL mux on Exynos542x enabled

7 weeks agoRISC-V: Check clint_time_val before use
Anup Patel [Sun, 27 Sep 2020 05:39:16 +0000 (11:09 +0530)]
RISC-V: Check clint_time_val before use

The NoMMU kernel is broken for QEMU virt machine from Linux-5.9-rc6
because clint_time_val is used even before CLINT driver is probed
at following places:
1. rand_initialize() calls get_cycles() which in-turn uses
   clint_time_val
2. boot_init_stack_canary() calls get_cycles() which in-turn
   uses clint_time_val

The issue#1 (above) is fixed by providing custom random_get_entropy()
for RISC-V NoMMU kernel. For issue#2 (above), we remove dependency of
boot_init_stack_canary() on get_cycles() and this is aligned with the
boot_init_stack_canary() implementations of ARM, ARM64 and MIPS kernel.

Fixes: d5be89a8d118 ("RISC-V: Resurrect the MMIO timer implementation for M-mode systems")
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Tested-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
7 weeks agobtrfs: fix filesystem corruption after a device replace
Filipe Manana [Wed, 23 Sep 2020 14:30:16 +0000 (15:30 +0100)]
btrfs: fix filesystem corruption after a device replace

We use a device's allocation state tree to track ranges in a device used
for allocated chunks, and we set ranges in this tree when allocating a new
chunk. However after a device replace operation, we were not setting the
allocated ranges in the new device's allocation state tree, so that tree
is empty after a device replace.

This means that a fitrim operation after a device replace will trim the
device ranges that have allocated chunks and extents, as we trim every
range for which there is not a range marked in the device's allocation
state tree. It is also important during chunk allocation, since the
device's allocation state is used to determine if a range is already
allocated when allocating a new chunk.

This is trivial to reproduce and the following script triggers the bug:

  $ cat reproducer.sh
  #!/bin/bash

  DEV1="/dev/sdg"
  DEV2="/dev/sdh"
  DEV3="/dev/sdi"

  wipefs -a $DEV1 $DEV2 $DEV3 &> /dev/null

  # Create a raid1 test fs on 2 devices.
  mkfs.btrfs -f -m raid1 -d raid1 $DEV1 $DEV2 > /dev/null
  mount $DEV1 /mnt/btrfs

  xfs_io -f -c "pwrite -S 0xab 0 10M" /mnt/btrfs/foo

  echo "Starting to replace $DEV1 with $DEV3"
  btrfs replace start -B $DEV1 $DEV3 /mnt/btrfs
  echo

  echo "Running fstrim"
  fstrim /mnt/btrfs
  echo

  echo "Unmounting filesystem"
  umount /mnt/btrfs

  echo "Mounting filesystem in degraded mode using $DEV3 only"
  wipefs -a $DEV1 $DEV2 &> /dev/null
  mount -o degraded $DEV3 /mnt/btrfs
  if [ $? -ne 0 ]; then
          dmesg | tail
          echo
          echo "Failed to mount in degraded mode"
          exit 1
  fi

  echo
  echo "File foo data (expected all bytes = 0xab):"
  od -A d -t x1 /mnt/btrfs/foo

  umount /mnt/btrfs

When running the reproducer:

  $ ./replace-test.sh
  wrote 10485760/10485760 bytes at offset 0
  10 MiB, 2560 ops; 0.0901 sec (110.877 MiB/sec and 28384.5216 ops/sec)
  Starting to replace /dev/sdg with /dev/sdi

  Running fstrim

  Unmounting filesystem
  Mounting filesystem in degraded mode using /dev/sdi only
  mount: /mnt/btrfs: wrong fs type, bad option, bad superblock on /dev/sdi, missing codepage or helper program, or other error.
  [19581.748641] BTRFS info (device sdg): dev_replace from /dev/sdg (devid 1) to /dev/sdi started
  [19581.803842] BTRFS info (device sdg): dev_replace from /dev/sdg (devid 1) to /dev/sdi finished
  [19582.208293] BTRFS info (device sdi): allowing degraded mounts
  [19582.208298] BTRFS info (device sdi): disk space caching is enabled
  [19582.208301] BTRFS info (device sdi): has skinny extents
  [19582.212853] BTRFS warning (device sdi): devid 2 uuid 1f731f47-e1bb-4f00-bfbb-9e5a0cb4ba9f is missing
  [19582.213904] btree_readpage_end_io_hook: 25839 callbacks suppressed
  [19582.213907] BTRFS error (device sdi): bad tree block start, want 30490624 have 0
  [19582.214780] BTRFS warning (device sdi): failed to read root (objectid=7): -5
  [19582.231576] BTRFS error (device sdi): open_ctree failed

  Failed to mount in degraded mode

So fix by setting all allocated ranges in the replace target device when
the replace operation is finishing, when we are holding the chunk mutex
and we can not race with new chunk allocations.

A test case for fstests follows soon.

Fixes: 1c11b63eff2a67 ("btrfs: replace pending/pinned chunks lists with io tree")
CC: stable@vger.kernel.org # 5.2+
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
7 weeks agobtrfs: move btrfs_rm_dev_replace_free_srcdev outside of all locks
Josef Bacik [Thu, 20 Aug 2020 15:18:27 +0000 (11:18 -0400)]
btrfs: move btrfs_rm_dev_replace_free_srcdev outside of all locks

When closing and freeing the source device we could end up doing our
final blkdev_put() on the bdev, which will grab the bd_mutex.  As such
we want to be holding as few locks as possible, so move this call
outside of the dev_replace->lock_finishing_cancel_unmount lock.  Since
we're modifying the fs_devices we need to make sure we're holding the
uuid_mutex here, so take that as well.

There's a report from syzbot probably hitting one of the cases where
the bd_mutex and device_list_mutex are taken in the wrong order, however
it's not with device replace, like this patch fixes. As there's no
reproducer available so far, we can't verify the fix.

https://lore.kernel.org/lkml/000000000000fc04d105afcf86d7@google.com/
link: https://syzkaller.appspot.com/bug?extid=84a0634dc5d21d488419
  WARNING: possible circular locking dependency detected
  5.9.0-rc5-syzkaller #0 Not tainted
  ------------------------------------------------------
  syz-executor.0/6878 is trying to acquire lock:
  ffff88804c17d780 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x30/0x520 fs/block_dev.c:1804

  but task is already holding lock:
  ffff8880908cfce0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: close_fs_devices.part.0+0x2e/0x800 fs/btrfs/volumes.c:1159

  which lock already depends on the new lock.

  the existing dependency chain (in reverse order) is:

  -> #4 (&fs_devs->device_list_mutex){+.+.}-{3:3}:
 __mutex_lock_common kernel/locking/mutex.c:956 [inline]
 __mutex_lock+0x134/0x10e0 kernel/locking/mutex.c:1103
 btrfs_finish_chunk_alloc+0x281/0xf90 fs/btrfs/volumes.c:5255
 btrfs_create_pending_block_groups+0x2f3/0x700 fs/btrfs/block-group.c:2109
 __btrfs_end_transaction+0xf5/0x690 fs/btrfs/transaction.c:916
 find_free_extent_update_loop fs/btrfs/extent-tree.c:3807 [inline]
 find_free_extent+0x23b7/0x2e60 fs/btrfs/extent-tree.c:4127
 btrfs_reserve_extent+0x166/0x460 fs/btrfs/extent-tree.c:4206
 cow_file_range+0x3de/0x9b0 fs/btrfs/inode.c:1063
 btrfs_run_delalloc_range+0x2cf/0x1410 fs/btrfs/inode.c:1838
 writepage_delalloc+0x150/0x460 fs/btrfs/extent_io.c:3439
 __extent_writepage+0x441/0xd00 fs/btrfs/extent_io.c:3653
 extent_write_cache_pages.constprop.0+0x69d/0x1040 fs/btrfs/extent_io.c:4249
 extent_writepages+0xcd/0x2b0 fs/btrfs/extent_io.c:4370
 do_writepages+0xec/0x290 mm/page-writeback.c:2352
 __writeback_single_inode+0x125/0x1400 fs/fs-writeback.c:1461
 writeback_sb_inodes+0x53d/0xf40 fs/fs-writeback.c:1721
 wb_writeback+0x2ad/0xd40 fs/fs-writeback.c:1894
 wb_do_writeback fs/fs-writeback.c:2039 [inline]
 wb_workfn+0x2dc/0x13e0 fs/fs-writeback.c:2080
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

  -> #3 (sb_internal#2){.+.+}-{0:0}:
 percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
 __sb_start_write+0x234/0x470 fs/super.c:1672
 sb_start_intwrite include/linux/fs.h:1690 [inline]
 start_transaction+0xbe7/0x1170 fs/btrfs/transaction.c:624
 find_free_extent_update_loop fs/btrfs/extent-tree.c:3789 [inline]
 find_free_extent+0x25e1/0x2e60 fs/btrfs/extent-tree.c:4127
 btrfs_reserve_extent+0x166/0x460 fs/btrfs/extent-tree.c:4206
 cow_file_range+0x3de/0x9b0 fs/btrfs/inode.c:1063
 btrfs_run_delalloc_range+0x2cf/0x1410 fs/btrfs/inode.c:1838
 writepage_delalloc+0x150/0x460 fs/btrfs/extent_io.c:3439
 __extent_writepage+0x441/0xd00 fs/btrfs/extent_io.c:3653
 extent_write_cache_pages.constprop.0+0x69d/0x1040 fs/btrfs/extent_io.c:4249
 extent_writepages+0xcd/0x2b0 fs/btrfs/extent_io.c:4370
 do_writepages+0xec/0x290 mm/page-writeback.c:2352
 __writeback_single_inode+0x125/0x1400 fs/fs-writeback.c:1461
 writeback_sb_inodes+0x53d/0xf40 fs/fs-writeback.c:1721
 wb_writeback+0x2ad/0xd40 fs/fs-writeback.c:1894
 wb_do_writeback fs/fs-writeback.c:2039 [inline]
 wb_workfn+0x2dc/0x13e0 fs/fs-writeback.c:2080
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

  -> #2 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}:
 __flush_work+0x60e/0xac0 kernel/workqueue.c:3041
 wb_shutdown+0x180/0x220 mm/backing-dev.c:355
 bdi_unregister+0x174/0x590 mm/backing-dev.c:872
 del_gendisk+0x820/0xa10 block/genhd.c:933
 loop_remove drivers/block/loop.c:2192 [inline]
 loop_control_ioctl drivers/block/loop.c:2291 [inline]
 loop_control_ioctl+0x3b1/0x480 drivers/block/loop.c:2257
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

  -> #1 (loop_ctl_mutex){+.+.}-{3:3}:
 __mutex_lock_common kernel/locking/mutex.c:956 [inline]
 __mutex_lock+0x134/0x10e0 kernel/locking/mutex.c:1103
 lo_open+0x19/0xd0 drivers/block/loop.c:1893
 __blkdev_get+0x759/0x1aa0 fs/block_dev.c:1507
 blkdev_get fs/block_dev.c:1639 [inline]
 blkdev_open+0x227/0x300 fs/block_dev.c:1753
 do_dentry_open+0x4b9/0x11b0 fs/open.c:817
 do_open fs/namei.c:3251 [inline]
 path_openat+0x1b9a/0x2730 fs/namei.c:3368
 do_filp_open+0x17e/0x3c0 fs/namei.c:3395
 do_sys_openat2+0x16d/0x420 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_sys_open fs/open.c:1192 [inline]
 __se_sys_open fs/open.c:1188 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1188
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

  -> #0 (&bdev->bd_mutex){+.+.}-{3:3}:
 check_prev_add kernel/locking/lockdep.c:2496 [inline]
 check_prevs_add kernel/locking/lockdep.c:2601 [inline]
 validate_chain kernel/locking/lockdep.c:3218 [inline]
 __lock_acquire+0x2a96/0x5780 kernel/locking/lockdep.c:4426
 lock_acquire+0x1f3/0xae0 kernel/locking/lockdep.c:5006
 __mutex_lock_common kernel/locking/mutex.c:956 [inline]
 __mutex_lock+0x134/0x10e0 kernel/locking/mutex.c:1103
 blkdev_put+0x30/0x520 fs/block_dev.c:1804
 btrfs_close_bdev fs/btrfs/volumes.c:1117 [inline]
 btrfs_close_bdev fs/btrfs/volumes.c:1107 [inline]
 btrfs_close_one_device fs/btrfs/volumes.c:1133 [inline]
 close_fs_devices.part.0+0x1a4/0x800 fs/btrfs/volumes.c:1161
 close_fs_devices fs/btrfs/volumes.c:1193 [inline]
 btrfs_close_devices+0x95/0x1f0 fs/btrfs/volumes.c:1179
 close_ctree+0x688/0x6cb fs/btrfs/disk-io.c:4149
 generic_shutdown_super+0x144/0x370 fs/super.c:464
 kill_anon_super+0x36/0x60 fs/super.c:1108
 btrfs_kill_super+0x38/0x50 fs/btrfs/super.c:2265
 deactivate_locked_super+0x94/0x160 fs/super.c:335
 deactivate_super+0xad/0xd0 fs/super.c:366
 cleanup_mnt+0x3a3/0x530 fs/namespace.c:1118
 task_work_run+0xdd/0x190 kernel/task_work.c:141
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:163 [inline]
 exit_to_user_mode_prepare+0x1e1/0x200 kernel/entry/common.c:190
 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:265
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

  other info that might help us debug this:

  Chain exists of:
    &bdev->bd_mutex --> sb_internal#2 --> &fs_devs->device_list_mutex

   Possible unsafe locking scenario:

 CPU0                    CPU1
 ----                    ----
    lock(&fs_devs->device_list_mutex);
 lock(sb_internal#2);
 lock(&fs_devs->device_list_mutex);
    lock(&bdev->bd_mutex);

   *** DEADLOCK ***

  3 locks held by syz-executor.0/6878:
   #0: ffff88809070c0e0 (&type->s_umount_key#70){++++}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:365
   #1: ffffffff8a5b37a8 (uuid_mutex){+.+.}-{3:3}, at: btrfs_close_devices+0x23/0x1f0 fs/btrfs/volumes.c:1178
   #2: ffff8880908cfce0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: close_fs_devices.part.0+0x2e/0x800 fs/btrfs/volumes.c:1159

  stack backtrace:
  CPU: 0 PID: 6878 Comm: syz-executor.0 Not tainted 5.9.0-rc5-syzkaller #0
  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
  Call Trace:
   __dump_stack lib/dump_stack.c:77 [inline]
   dump_stack+0x198/0x1fd lib/dump_stack.c:118
   check_noncircular+0x324/0x3e0 kernel/locking/lockdep.c:1827
   check_prev_add kernel/locking/lockdep.c:2496 [inline]
   check_prevs_add kernel/locking/lockdep.c:2601 [inline]
   validate_chain kernel/locking/lockdep.c:3218 [inline]
   __lock_acquire+0x2a96/0x5780 kernel/locking/lockdep.c:4426
   lock_acquire+0x1f3/0xae0 kernel/locking/lockdep.c:5006
   __mutex_lock_common kernel/locking/mutex.c:956 [inline]
   __mutex_lock+0x134/0x10e0 kernel/locking/mutex.c:1103
   blkdev_put+0x30/0x520 fs/block_dev.c:1804
   btrfs_close_bdev fs/btrfs/volumes.c:1117 [inline]
   btrfs_close_bdev fs/btrfs/volumes.c:1107 [inline]
   btrfs_close_one_device fs/btrfs/volumes.c:1133 [inline]
   close_fs_devices.part.0+0x1a4/0x800 fs/btrfs/volumes.c:1161
   close_fs_devices fs/btrfs/volumes.c:1193 [inline]
   btrfs_close_devices+0x95/0x1f0 fs/btrfs/volumes.c:1179
   close_ctree+0x688/0x6cb fs/btrfs/disk-io.c:4149
   generic_shutdown_super+0x144/0x370 fs/super.c:464
   kill_anon_super+0x36/0x60 fs/super.c:1108
   btrfs_kill_super+0x38/0x50 fs/btrfs/super.c:2265
   deactivate_locked_super+0x94/0x160 fs/super.c:335
   deactivate_super+0xad/0xd0 fs/super.c:366
   cleanup_mnt+0x3a3/0x530 fs/namespace.c:1118
   task_work_run+0xdd/0x190 kernel/task_work.c:141
   tracehook_notify_resume include/linux/tracehook.h:188 [inline]
   exit_to_user_mode_loop kernel/entry/common.c:163 [inline]
   exit_to_user_mode_prepare+0x1e1/0x200 kernel/entry/common.c:190
   syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:265
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  RIP: 0033:0x460027
  RSP: 002b:00007fff59216328 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
  RAX: 0000000000000000 RBX: 0000000000076035 RCX: 0000000000460027
  RDX: 0000000000403188 RSI: 0000000000000002 RDI: 00007fff592163d0
  RBP: 0000000000000333 R08: 0000000000000000 R09: 000000000000000b
  R10: 0000000000000005 R11: 0000000000000246 R12: 00007fff59217460
  R13: 0000000002df2a60 R14: 0000000000000000 R15: 00007fff59217460

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
[ add syzbot reference ]
Signed-off-by: David Sterba <dsterba@suse.com>
8 weeks agoARM: imx6q: Fixup RCU usage for cpuidle
Ulf Hansson [Wed, 30 Sep 2020 11:20:23 +0000 (13:20 +0200)]
ARM: imx6q: Fixup RCU usage for cpuidle

The commit eb1f00237aca ("lockdep,trace: Expose tracepoints"), started to
expose us for tracepoints. For imx6q cpuidle, this leads to an RCU splat
according to below.

[6.870684] [<c0db7690>] (_raw_spin_lock) from [<c011f6a4>] (imx6q_enter_wait+0x18/0x9c)
[6.878846] [<c011f6a4>] (imx6q_enter_wait) from [<c09abfb0>] (cpuidle_enter_state+0x168/0x5e4)

To fix the problem, let's assign the corresponding idlestate->flags the
CPUIDLE_FLAG_RCU_IDLE bit, which enables us to call rcu_idle_enter|exit()
at the proper point.

Reported-by: Dong Aisheng <aisheng.dong@nxp.com>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
8 weeks agoDocumentation: PM: Fix a reStructuredText syntax error
Yoann Congal [Tue, 29 Sep 2020 20:41:58 +0000 (22:41 +0200)]
Documentation: PM: Fix a reStructuredText syntax error

Fix a reStructuredText syntax error in the cpuidle PM admin-guide
documentation: the ``...'' quotation marks are parsed as partial ''...''
reStructuredText markup and break the output formatting.

This change them to "...".

Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
8 weeks agocpufreq: intel_pstate: Fix missing return statement
Zhang Rui [Mon, 28 Sep 2020 03:33:42 +0000 (11:33 +0800)]
cpufreq: intel_pstate: Fix missing return statement

Fix missing return statement when writing "off" to intel_pstate status
sysfs I/F.

Fixes: 55671ea3257a ("cpufreq: intel_pstate: Free memory only when turning off")
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
8 weeks agodrm/amdgpu: disable gfxoff temporarily for navy_flounder
Jiansong Chen [Wed, 30 Sep 2020 07:30:24 +0000 (15:30 +0800)]
drm/amdgpu: disable gfxoff temporarily for navy_flounder

gfxoff is temporarily disabled for navy_flounder, since
at present the feature caused some tdr when performing
display operations.

Signed-off-by: Jiansong Chen <Jiansong.Chen@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 weeks agodrm/amd/pm: setup APU dpm clock table in SMU HW initialization
Evan Quan [Wed, 30 Sep 2020 04:07:56 +0000 (12:07 +0800)]
drm/amd/pm: setup APU dpm clock table in SMU HW initialization

As the dpm clock table is needed during DC HW initialization.
And that (DC HW initialization) comes before smu_late_init()
where current APU dpm clock table setup is performed. So, NULL
pointer dereference will be triggered. By moving APU dpm clock
table setup to smu_hw_init(), this can be avoided.

Fixes: 02cf91c113ea ("drm/amd/powerplay: postpone operations not required for hw setup to late_init")
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reported-by: Dirk Gouders <dirk@gouders.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 weeks agoMerge tag 'gpio-fixes-for-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Walleij [Wed, 30 Sep 2020 09:38:04 +0000 (11:38 +0200)]
Merge tag 'gpio-fixes-for-v5.9' of git://git./linux/kernel/git/brgl/linux into fixes

gpio fixes for v5.9

- correct logic of GPIO_LINE_DIRECTION in gpio-amd-fch

8 weeks agoclocksource: clint: Export clint_time_val for modules
Palmer Dabbelt [Wed, 30 Sep 2020 06:48:47 +0000 (23:48 -0700)]
clocksource: clint: Export clint_time_val for modules

clint_time_val will soon be used by the RISC-V implementation of
random_get_entropy(), which is a static inline function that may be used by
modules (at least CRYPTO_JITTERENTROPY=m).

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
8 weeks agoMerge branch 'vmwgfx-fixes-5.9' of git://people.freedesktop.org/~sroland/linux into...
Dave Airlie [Wed, 30 Sep 2020 04:21:22 +0000 (14:21 +1000)]
Merge branch 'vmwgfx-fixes-5.9' of git://people.freedesktop.org/~sroland/linux into drm-fixes

One vmwgfx regression fix.

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: "Roland Scheidegger (VMware)" <rscheidegger.oss@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200930041000.2423-1-rscheidegger.oss@gmail.com
8 weeks agodrm/vmwgfx: Fix error handling in get_node
Zack Rusin [Fri, 25 Sep 2020 15:54:10 +0000 (11:54 -0400)]
drm/vmwgfx: Fix error handling in get_node

ttm_mem_type_manager_func.get_node was changed to return -ENOSPC
instead of setting the node pointer to NULL. Unfortunately
vmwgfx still had two places where it was explicitly converting
-ENOSPC to 0 causing regressions. This fixes those spots by
allowing -ENOSPC to be returned. That seems to fix recent
regressions with vmwgfx.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Sigend-off-by: Roland Scheidegger <sroland@vmware.com>
8 weeks agoscsi: iscsi: iscsi_tcp: Avoid holding spinlock while calling getpeername()
Mark Mielke [Mon, 28 Sep 2020 04:33:29 +0000 (00:33 -0400)]
scsi: iscsi: iscsi_tcp: Avoid holding spinlock while calling getpeername()

The kernel may fail to boot or devices may fail to come up when
initializing iscsi_tcp devices starting with Linux 5.8.

Commit a79af8a64d39 ("[SCSI] iscsi_tcp: use iscsi_conn_get_addr_param
libiscsi function") introduced getpeername() within the session spinlock.

Commit 1b66d253610c ("bpf: Add get{peer, sock}name attach types for
sock_addr") introduced BPF_CGROUP_RUN_SA_PROG_LOCK() within getpeername(),
which acquires a mutex and when used from iscsi_tcp devices can now lead to
"BUG: scheduling while atomic:" and subsequent damage.

Ensure that the spinlock is released before calling getpeername() or
getsockname(). sock_hold() and sock_put() are used to ensure that the
socket reference is preserved until after the getpeername() or
getsockname() complete.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1877345
Link: https://lkml.org/lkml/2020/7/28/1085
Link: https://lkml.org/lkml/2020/8/31/459
Link: https://lore.kernel.org/r/20200928043329.606781-1-mark.mielke@gmail.com
Fixes: a79af8a64d39 ("[SCSI] iscsi_tcp: use iscsi_conn_get_addr_param libiscsi function")
Fixes: 1b66d253610c ("bpf: Add get{peer, sock}name attach types for sock_addr")
Cc: stable@vger.kernel.org
Reported-by: Marc Dionne <marc.c.dionne@gmail.com>
Tested-by: Marc Dionne <marc.c.dionne@gmail.com>
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Mark Mielke <mark.mielke@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
8 weeks agoMerge tag 'devicetree-fixes-for-5.9-3' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Wed, 30 Sep 2020 00:56:30 +0000 (17:56 -0700)]
Merge tag 'devicetree-fixes-for-5.9-3' of git://git./linux/kernel/git/robh/linux

Pull devicetree fixes from Rob Herring:

 - Fix handling of HOST_EXTRACFLAGS for dtc

 - Several warning fixes for DT bindings

* tag 'devicetree-fixes-for-5.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  scripts/dtc: only append to HOST_EXTRACFLAGS instead of overwriting
  dt-bindings: Fix 'reg' size issues in zynqmp examples
  ARM: dts: bcm2835: Change firmware compatible from simple-bus to simple-mfd
  dt-bindings: leds: cznic,turris-omnia-leds: fix error in binding
  dt-bindings: crypto: sa2ul: fix a DT binding check warning

8 weeks agoautofs: use __kernel_write() for the autofs pipe writing
Linus Torvalds [Wed, 30 Sep 2020 00:18:34 +0000 (17:18 -0700)]
autofs: use __kernel_write() for the autofs pipe writing

autofs got broken in some configurations by commit 13c164b1a186
("autofs: switch to kernel_write") because there is now an extra LSM
permission check done by security_file_permission() in rw_verify_area().

autofs is one if the few places that really does want the much more
limited __kernel_write(), because the write is an internal kernel one
that shouldn't do any user permission checks (it also doesn't need the
file_start_write/file_end_write logic, since it's just a pipe).

There are a couple of other cases like that - accounting, core dumping,
and splice - but autofs stands out because it can be built as a module.

As a result, we need to export this internal __kernel_write() function
again.

We really don't want any other module to use this, but we don't have a
"EXPORT_SYMBOL_FOR_AUTOFS_ONLY()".  But we can mark it GPL-only to at
least approximate that "internal use only" for licensing.

While in this area, make autofs pass in NULL for the file position
pointer, since it's always a pipe, and we now use a NULL file pointer
for streaming file descriptors (see file_ppos() and commit 438ab720c675:
"vfs: pass ppos=NULL to .read()/.write() of FMODE_STREAM files")

This effectively reverts commits 9db977522449 ("fs: unexport
__kernel_write") and 13c164b1a186 ("autofs: switch to kernel_write").

Fixes: 13c164b1a186 ("autofs: switch to kernel_write")
Reported-by: Ondrej Mosnacek <omosnace@redhat.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Acked-by: Ian Kent <raven@themaw.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 weeks agodrm/amd/display: remove duplicate call to rn_vbios_smu_get_smu_version()
Dirk Gouders [Sun, 27 Sep 2020 09:39:45 +0000 (11:39 +0200)]
drm/amd/display: remove duplicate call to rn_vbios_smu_get_smu_version()

Commit 78fe9f63947a2b ("drm/amd/display: Remove DISPCLK Limit Floor for Certain SMU Versions")
added a call to rn_vbios_smu_get_smu_version() to set clk_mgr->smu_ver.
That field is initialized prior to the if-statement, already.

Fixes: 78fe9f63947a2b (drm/amd/display: Remove DISPCLK Limit Floor for Certain SMU Versions)
Signed-off-by: Dirk Gouders <dirk@gouders.net>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Sung Lee <sung.lee@amd.com>
Cc: Yongqiang Sun <yongqiang.sun@amd.com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 weeks agodrm/amdgpu/swsmu/smu12: fix force clock handling for mclk
Alex Deucher [Mon, 28 Sep 2020 18:16:25 +0000 (14:16 -0400)]
drm/amdgpu/swsmu/smu12: fix force clock handling for mclk

The state array is in the reverse order compared to other asics
(high to low rather than low to high).

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1313
Reviewed-by: Prike Liang <Prike.Liang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 weeks agodrm/amdgpu: restore proper ref count in amdgpu_display_crtc_set_config
Jean Delvare [Mon, 28 Sep 2020 09:10:37 +0000 (11:10 +0200)]
drm/amdgpu: restore proper ref count in amdgpu_display_crtc_set_config

A recent attempt to fix a ref count leak in
amdgpu_display_crtc_set_config() turned out to be doing too much and
"fixed" an intended decrease as if it were a leak. Undo that part to
restore the proper balance. This is the very nature of this function
to increase or decrease the power reference count depending on the
situation.

Consequences of this bug is that the power reference would
eventually get down to 0 while the display was still in use,
resulting in that display switching off unexpectedly.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Fixes: e008fa6fb415 ("drm/amdgpu: fix ref count leak in amdgpu_display_crtc_set_config")
Cc: stable@vger.kernel.org
Cc: Navid Emamdoost <navid.emamdoost@gmail.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 weeks agodrm/amdgpu/display: fix CFLAGS setup for DCN30
Alex Deucher [Tue, 22 Sep 2020 15:34:16 +0000 (11:34 -0400)]
drm/amdgpu/display: fix CFLAGS setup for DCN30

Properly handle clang and older versions of gcc.

Fixes: e77165bf7b02a3 ("drm/amd/display: Add DCN3 blocks to Makefile")
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 weeks agodrm/amd/display: fix return value check for hdcp_work
Flora Cui [Wed, 23 Sep 2020 06:42:59 +0000 (14:42 +0800)]
drm/amd/display: fix return value check for hdcp_work

max_caps might be 0, thus hdcp_work might be ZERO_SIZE_PTR

Signed-off-by: Flora Cui <flora.cui@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 weeks agodrm/amdgpu: remove gpu_info fw support for sienna_cichlid etc.
Jiansong Chen [Wed, 23 Sep 2020 03:58:23 +0000 (11:58 +0800)]
drm/amdgpu: remove gpu_info fw support for sienna_cichlid etc.

Remove gpu_info fw support for sienna_cichlid etc., since the
information can be retrieved from discovery binary.

Signed-off-by: Jiansong Chen <Jiansong.Chen@amd.com>
Reviewed-by: Likun Gao <Likun.Gao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 weeks agodrm/amd/pm: Removed fixed clock in auto mode DPM
Sudheesh Mavila [Tue, 15 Sep 2020 07:18:20 +0000 (12:48 +0530)]
drm/amd/pm: Removed fixed clock in auto mode DPM

SMU10_UMD_PSTATE_PEAK_FCLK value should not be used to set the DPM.

Suggested-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Sudheesh Mavila <sudheesh.mavila@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 weeks agoscripts/dtc: only append to HOST_EXTRACFLAGS instead of overwriting
Uwe Kleine-König [Sat, 19 Sep 2020 14:39:22 +0000 (16:39 +0200)]
scripts/dtc: only append to HOST_EXTRACFLAGS instead of overwriting

When building with

$ HOST_EXTRACFLAGS=-g make

the expectation is that host tools are built with debug informations.
This however doesn't happen if the Makefile assigns a new value to the
HOST_EXTRACFLAGS instead of appending to it. So use += instead of := for
the first assignment.

Fixes: e3fd9b5384f3 ("scripts/dtc: consolidate include path options in Makefile")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Rob Herring <robh@kernel.org>
8 weeks agodt-bindings: Fix 'reg' size issues in zynqmp examples
Rob Herring [Mon, 28 Sep 2020 15:22:56 +0000 (10:22 -0500)]
dt-bindings: Fix 'reg' size issues in zynqmp examples

The default sizes in examples for 'reg' are 1 cell each. Fix the
incorrect sizes in zynqmp examples:

Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.example.dt.yaml: example-0: dma-controller@fd4c0000:reg:0: [0, 4249616384, 0, 4096] is too long
From schema: /usr/local/lib/python3.8/dist-packages/dtschema/schemas/reg.yaml
Documentation/devicetree/bindings/display/xlnx/xlnx,zynqmp-dpsub.example.dt.yaml: example-0: display@fd4a0000:reg:0: [0, 4249485312, 0, 4096] is too long
From schema: /usr/local/lib/python3.8/dist-packages/dtschema/schemas/reg.yaml
Documentation/devicetree/bindings/display/xlnx/xlnx,zynqmp-dpsub.example.dt.yaml: example-0: display@fd4a0000:reg:1: [0, 4249526272, 0, 4096] is too long
From schema: /usr/local/lib/python3.8/dist-packages/dtschema/schemas/reg.yaml
Documentation/devicetree/bindings/display/xlnx/xlnx,zynqmp-dpsub.example.dt.yaml: example-0: display@fd4a0000:reg:2: [0, 4249530368, 0, 4096] is too long
From schema: /usr/local/lib/python3.8/dist-packages/dtschema/schemas/reg.yaml
Documentation/devicetree/bindings/display/xlnx/xlnx,zynqmp-dpsub.example.dt.yaml: example-0: display@fd4a0000:reg:3: [0, 4249534464, 0, 4096] is too long
From schema: /usr/local/lib/python3.8/dist-packages/dtschema/schemas/reg.yaml

Cc: Hyun Kwon <hyun.kwon@xilinx.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: dri-devel@lists.freedesktop.org
Cc: dmaengine@vger.kernel.org
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Rob Herring <robh@kernel.org>
8 weeks agoMerge tag 'dmaengine-fix-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul...
Linus Torvalds [Tue, 29 Sep 2020 17:35:42 +0000 (10:35 -0700)]
Merge tag 'dmaengine-fix-5.9' of git://git./linux/kernel/git/vkoul/dmaengine

Pull dmaengine fix from Vinod Koul:
 "Fix dmatest for misconfigured channel"

* tag 'dmaengine-fix-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine:
  dmaengine: dmatest: Prevent to run on misconfigured channel

8 weeks agoMerge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
Linus Torvalds [Tue, 29 Sep 2020 17:33:06 +0000 (10:33 -0700)]
Merge tag 'for_linus' of git://git./linux/kernel/git/mst/vhost

Pull virtio fixes from Michael Tsirkin:
 "A couple of last minute fixes"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  vhost-vdpa: fix backend feature ioctls
  vhost: Fix documentation

8 weeks agoftrace: Move RCU is watching check after recursion check
Steven Rostedt (VMware) [Tue, 29 Sep 2020 16:40:31 +0000 (12:40 -0400)]
ftrace: Move RCU is watching check after recursion check

The first thing that the ftrace function callback helper functions should do
is to check for recursion. Peter Zijlstra found that when
"rcu_is_watching()" had its notrace removed, it caused perf function tracing
to crash. This is because the call of rcu_is_watching() is tested before
function recursion is checked and and if it is traced, it will cause an
infinite recursion loop.

rcu_is_watching() should still stay notrace, but to prevent this should
never had crashed in the first place. The recursion prevention must be the
first thing done in callback functions.

Link: https://lore.kernel.org/r/20200929112541.GM2628@hirez.programming.kicks-ass.net
Cc: stable@vger.kernel.org
Cc: Paul McKenney <paulmck@kernel.org>
Fixes: c68c0fa293417 ("ftrace: Have ftrace_ops_get_func() handle RCU and PER_CPU flags too")
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reported-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
8 weeks agotracing: Fix trace_find_next_entry() accounting of temp buffer size
Steven Rostedt (VMware) [Tue, 29 Sep 2020 16:27:23 +0000 (12:27 -0400)]
tracing: Fix trace_find_next_entry() accounting of temp buffer size

The temp buffer size variable for trace_find_next_entry() was incorrectly
being updated when the size did not change. The temp buffer size should only
be updated when it is reallocated.

This is mostly an issue when used with ftrace_dump(). That's because
ftrace_dump() can not allocate a new buffer, and instead uses a temporary
buffer with a fix size. But the variable that keeps track of that size is
incorrectly updated with each call, and it could fall into the path that
would try to reallocate the buffer and produce a warning.

 ------------[ cut here ]------------
 WARNING: CPU: 1 PID: 1601 at kernel/trace/trace.c:3548
trace_find_next_entry+0xd0/0xe0
 Modules linked in [..]
 CPU: 1 PID: 1601 Comm: bash Not tainted 5.9.0-rc5-test+ #521
 Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v03.03
07/14/2016
 RIP: 0010:trace_find_next_entry+0xd0/0xe0
 Code: 40 21 00 00 4c 89 e1 31 d2 4c 89 ee 48 89 df e8 c6 9e ff ff 89 ab 54
21 00 00 5b 5d 41 5c 41 5d c3 48 63 d5 eb bf 31 c0 eb f0 <0f> 0b 48 63 d5 eb
b4 66 0f 1f 84 00 00 00 00 00 53 48 8d 8f 60 21
 RSP: 0018:ffff95a4f2e8bd70 EFLAGS: 00010046
 RAX: ffffffff96679fc0 RBX: ffffffff97910de0 RCX: ffffffff96679fc0
 RDX: ffff95a4f2e8bd98 RSI: ffff95a4ee321098 RDI: ffffffff97913000
 RBP: 0000000000000018 R08: 0000000000000000 R09: 0000000000000000
 R10: 0000000000000001 R11: 0000000000000046 R12: ffff95a4f2e8bd98
 R13: 0000000000000000 R14: ffff95a4ee321098 R15: 00000000009aa301
 FS:  00007f8565484740(0000) GS:ffff95a55aa40000(0000)
knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 000055876bd43d90 CR3: 00000000b76e6003 CR4: 00000000001706e0
 Call Trace:
  trace_print_lat_context+0x58/0x2d0
  ? cpumask_next+0x16/0x20
  print_trace_line+0x1a4/0x4f0
  ftrace_dump.cold+0xad/0x12c
  __handle_sysrq.cold+0x51/0x126
  write_sysrq_trigger+0x3f/0x4a
  proc_reg_write+0x53/0x80
  vfs_write+0xca/0x210
  ksys_write+0x70/0xf0
  do_syscall_64+0x33/0x40
  entry_SYSCALL_64_after_hwframe+0x44/0xa9
 RIP: 0033:0x7f8565579487
 Code: 64 89 02 48 c7 c0 ff ff ff ff eb bb 0f 1f 80 00 00 00 00 f3 0f 1e fa
64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff
77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
 RSP: 002b:00007ffd40707948 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f8565579487
 RDX: 0000000000000002 RSI: 000055876bd74de0 RDI: 0000000000000001
 RBP: 000055876bd74de0 R08: 000000000000000a R09: 0000000000000001
 R10: 000055876bdec280 R11: 0000000000000246 R12: 0000000000000002
 R13: 00007f856564a500 R14: 0000000000000002 R15: 00007f856564a700
 irq event stamp: 109958
 ---[ end trace 7aab5b7e51484b00 ]---

Not only fix the updating of the temp buffer, but also do not free the temp
buffer before a new buffer is allocated (there's no reason to not continue
to use the current temp buffer if an allocation fails).

Cc: stable@vger.kernel.org
Fixes: 8e99cf91b99bb ("tracing: Do not allocate buffer in trace_find_next_entry() in atomic")
Reported-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
8 weeks agoMerge tag 'phy-fixes-2-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/phy...
Greg Kroah-Hartman [Tue, 29 Sep 2020 15:21:54 +0000 (17:21 +0200)]
Merge tag 'phy-fixes-2-5.9' of git://git./linux/kernel/git/phy/linux-phy into usb-linus

Vinod writes:

phy: Second round of fixes for 5.9

*) Fix of leak in TI phy driver

* tag 'phy-fixes-2-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy:
  phy: ti: am654: Fix a leak in serdes_am654_probe()

8 weeks agoblk-mq: call commit_rqs while list empty but error happen
yangerkun [Sat, 5 Sep 2020 11:25:56 +0000 (19:25 +0800)]
blk-mq: call commit_rqs while list empty but error happen

Blk-mq should call commit_rqs once 'bd.last != true' and no more
request will come(so virtscsi can kick the virtqueue, e.g.). We already
do that in 'blk_mq_dispatch_rq_list/blk_mq_try_issue_list_directly' while
list not empty and 'queued > 0'. However, we can seen the same scene
once the last request in list call queue_rq and return error like
BLK_STS_IOERR which will not requeue the request, and lead that list
empty but need call commit_rqs too(Or the request for virtscsi will stay
timeout until other request kick virtqueue).

We found this problem by do fsstress test with offline/online virtscsi
device repeat quickly.

Fixes: d666ba98f849 ("blk-mq: add mq_ops->commit_rqs()")
Reported-by: zhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: yangerkun <yangerkun@huawei.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
8 weeks agoio_uring: fix async buffered reads when readahead is disabled
Hao Xu [Tue, 29 Sep 2020 12:00:45 +0000 (20:00 +0800)]
io_uring: fix async buffered reads when readahead is disabled

The async buffered reads feature is not working when readahead is
turned off. There are two things to concern:

- when doing retry in io_read, not only the IOCB_WAITQ flag but also
  the IOCB_NOWAIT flag is still set, which makes it goes to would_block
  phase in generic_file_buffered_read() and then return -EAGAIN. After
  that, the io-wq thread work is queued, and later doing the async
  reads in the old way.

- even if we remove IOCB_NOWAIT when doing retry, the feature is still
  not running properly, since in generic_file_buffered_read() it goes to
  lock_page_killable() after calling mapping->a_ops->readpage() to do
  IO, and thus causing process to sleep.

Fixes: 1a0a7853b901 ("mm: support async buffered reads in generic_file_buffered_read()")
Fixes: 3b2a4439e0ae ("io_uring: get rid of kiocb_wait_page_queue_init()")
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
8 weeks agoMerge tag 'gpio-fixes-for-v5.9-rc7' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Walleij [Tue, 29 Sep 2020 11:40:37 +0000 (13:40 +0200)]
Merge tag 'gpio-fixes-for-v5.9-rc7' of git://git./linux/kernel/git/brgl/linux into fixes

gpio: fixes for v5.9-rc7

- fix uninitialized variable in gpio-pca953x
- enable all 160 lines and fix interrupt configuration in gpio-aspeed-gpio
- fix ast2600 bank properties in gpio-aspeed

8 weeks agoInput: i8042 - add nopnp quirk for Acer Aspire 5 A515
Jiri Kosina [Mon, 28 Sep 2020 23:21:17 +0000 (16:21 -0700)]
Input: i8042 - add nopnp quirk for Acer Aspire 5 A515

Touchpad on this laptop is not detected properly during boot, as PNP
enumerates (wrongly) AUX port as disabled on this machine.

Fix that by adding this board (with admittedly quite funny DMI
identifiers) to nopnp quirk list.

Reported-by: Andrés Barrantes Silman <andresbs2000@protonmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Link: https://lore.kernel.org/r/nycvar.YFH.7.76.2009252337340.3336@cbobk.fhfr.pm
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
8 weeks agoInput: trackpoint - enable Synaptics trackpoints
Vincent Huang [Mon, 28 Sep 2020 23:19:05 +0000 (16:19 -0700)]
Input: trackpoint - enable Synaptics trackpoints

Add Synaptics IDs in trackpoint_start_protocol() to mark them as valid.

Signed-off-by: Vincent Huang <vincent.huang@tw.synaptics.com>
Fixes: 6c77545af100 ("Input: trackpoint - add new trackpoint variant IDs")
Reviewed-by: Harry Cutts <hcutts@chromium.org>
Tested-by: Harry Cutts <hcutts@chromium.org>
Link: https://lore.kernel.org/r/20200924053013.1056953-1-vincent.huang@tw.synaptics.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
8 weeks agoMerge tag 'nfs-for-5.9-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Linus Torvalds [Mon, 28 Sep 2020 18:05:56 +0000 (11:05 -0700)]
Merge tag 'nfs-for-5.9-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 "Highlights include:

   - NFSv4.2: copy_file_range needs to invalidate caches on success

   - NFSv4.2: Fix security label length not being reset

   - pNFS/flexfiles: Ensure we initialise the mirror bsizes correctly
     on read

   - pNFS/flexfiles: Fix signed/unsigned type issues with mirror
     indices"

* tag 'nfs-for-5.9-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  pNFS/flexfiles: Be consistent about mirror index types
  pNFS/flexfiles: Ensure we initialise the mirror bsizes correctly on read
  NFSv4.2: fix client's attribute cache management for copy_file_range
  nfs: Fix security label length not being reset

8 weeks agomm: do not rely on mm == current->mm in __get_user_pages_locked
Jason A. Donenfeld [Mon, 28 Sep 2020 10:35:07 +0000 (12:35 +0200)]
mm: do not rely on mm == current->mm in __get_user_pages_locked

It seems likely this block was pasted from internal_get_user_pages_fast,
which is not passed an mm struct and therefore uses current's.  But
__get_user_pages_locked is passed an explicit mm, and current->mm is not
always valid. This was hit when being called from i915, which uses:

  pin_user_pages_remote->
    __get_user_pages_remote->
      __gup_longterm_locked->
        __get_user_pages_locked

Before, this would lead to an OOPS:

  BUG: kernel NULL pointer dereference, address: 0000000000000064
  #PF: supervisor write access in kernel mode
  #PF: error_code(0x0002) - not-present page
  CPU: 10 PID: 1431 Comm: kworker/u33:1 Tainted: P S   U     O      5.9.0-rc7+ #140
  Hardware name: LENOVO 20QTCTO1WW/20QTCTO1WW, BIOS N2OET47W (1.34 ) 08/06/2020
  Workqueue: i915-userptr-acquire __i915_gem_userptr_get_pages_worker [i915]
  RIP: 0010:__get_user_pages_remote+0xd7/0x310
  Call Trace:
   __i915_gem_userptr_get_pages_worker+0xc8/0x260 [i915]
   process_one_work+0x1ca/0x390
   worker_thread+0x48/0x3c0
   kthread+0x114/0x130
   ret_from_fork+0x1f/0x30
  CR2: 0000000000000064

This commit fixes the problem by using the mm pointer passed to the
function rather than the bogus one in current.

Fixes: 008cfe4418b3 ("mm: Introduce mm_struct.has_pinned")
Tested-by: Chris Wilson <chris@chris-wilson.co.uk>
Reported-by: Harald Arnesen <harald@skogtun.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 weeks agoio_uring: fix potential ABBA deadlock in ->show_fdinfo()
Jens Axboe [Mon, 28 Sep 2020 14:57:48 +0000 (08:57 -0600)]
io_uring: fix potential ABBA deadlock in ->show_fdinfo()

syzbot reports a potential lock deadlock between the normal IO path and
->show_fdinfo():

======================================================
WARNING: possible circular locking dependency detected
5.9.0-rc6-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/19710 is trying to acquire lock:
ffff888098ddc450 (sb_writers#4){.+.+}-{0:0}, at: io_write+0x6b5/0xb30 fs/io_uring.c:3296

but task is already holding lock:
ffff8880a11b8428 (&ctx->uring_lock){+.+.}-{3:3}, at: __do_sys_io_uring_enter+0xe9a/0x1bd0 fs/io_uring.c:8348

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #2 (&ctx->uring_lock){+.+.}-{3:3}:
       __mutex_lock_common kernel/locking/mutex.c:956 [inline]
       __mutex_lock+0x134/0x10e0 kernel/locking/mutex.c:1103
       __io_uring_show_fdinfo fs/io_uring.c:8417 [inline]
       io_uring_show_fdinfo+0x194/0xc70 fs/io_uring.c:8460
       seq_show+0x4a8/0x700 fs/proc/fd.c:65
       seq_read+0x432/0x1070 fs/seq_file.c:208
       do_loop_readv_writev fs/read_write.c:734 [inline]
       do_loop_readv_writev fs/read_write.c:721 [inline]
       do_iter_read+0x48e/0x6e0 fs/read_write.c:955
       vfs_readv+0xe5/0x150 fs/read_write.c:1073
       kernel_readv fs/splice.c:355 [inline]
       default_file_splice_read.constprop.0+0x4e6/0x9e0 fs/splice.c:412
       do_splice_to+0x137/0x170 fs/splice.c:871
       splice_direct_to_actor+0x307/0x980 fs/splice.c:950
       do_splice_direct+0x1b3/0x280 fs/splice.c:1059
       do_sendfile+0x55f/0xd40 fs/read_write.c:1540
       __do_sys_sendfile64 fs/read_write.c:1601 [inline]
       __se_sys_sendfile64 fs/read_write.c:1587 [inline]
       __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1587
       do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

-> #1 (&p->lock){+.+.}-{3:3}:
       __mutex_lock_common kernel/locking/mutex.c:956 [inline]
       __mutex_lock+0x134/0x10e0 kernel/locking/mutex.c:1103
       seq_read+0x61/0x1070 fs/seq_file.c:155
       pde_read fs/proc/inode.c:306 [inline]
       proc_reg_read+0x221/0x300 fs/proc/inode.c:318
       do_loop_readv_writev fs/read_write.c:734 [inline]
       do_loop_readv_writev fs/read_write.c:721 [inline]
       do_iter_read+0x48e/0x6e0 fs/read_write.c:955
       vfs_readv+0xe5/0x150 fs/read_write.c:1073
       kernel_readv fs/splice.c:355 [inline]
       default_file_splice_read.constprop.0+0x4e6/0x9e0 fs/splice.c:412
       do_splice_to+0x137/0x170 fs/splice.c:871
       splice_direct_to_actor+0x307/0x980 fs/splice.c:950
       do_splice_direct+0x1b3/0x280 fs/splice.c:1059
       do_sendfile+0x55f/0xd40 fs/read_write.c:1540
       __do_sys_sendfile64 fs/read_write.c:1601 [inline]
       __se_sys_sendfile64 fs/read_write.c:1587 [inline]
       __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1587
       do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

-> #0 (sb_writers#4){.+.+}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:2496 [inline]
       check_prevs_add kernel/locking/lockdep.c:2601 [inline]
       validate_chain kernel/locking/lockdep.c:3218 [inline]
       __lock_acquire+0x2a96/0x5780 kernel/locking/lockdep.c:4441
       lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5029
       percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
       __sb_start_write+0x228/0x450 fs/super.c:1672
       io_write+0x6b5/0xb30 fs/io_uring.c:3296
       io_issue_sqe+0x18f/0x5c50 fs/io_uring.c:5719
       __io_queue_sqe+0x280/0x1160 fs/io_uring.c:6175
       io_queue_sqe+0x692/0xfa0 fs/io_uring.c:6254
       io_submit_sqe fs/io_uring.c:6324 [inline]
       io_submit_sqes+0x1761/0x2400 fs/io_uring.c:6521
       __do_sys_io_uring_enter+0xeac/0x1bd0 fs/io_uring.c:8349
       do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

other info that might help us debug this:

Chain exists of:
  sb_writers#4 --> &p->lock --> &ctx->uring_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ctx->uring_lock);
                               lock(&p->lock);
                               lock(&ctx->uring_lock);
  lock(sb_writers#4);

 *** DEADLOCK ***

1 lock held by syz-executor.2/19710:
 #0: ffff8880a11b8428 (&ctx->uring_lock){+.+.}-{3:3}, at: __do_sys_io_uring_enter+0xe9a/0x1bd0 fs/io_uring.c:8348

stack backtrace:
CPU: 0 PID: 19710 Comm: syz-executor.2 Not tainted 5.9.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 check_noncircular+0x324/0x3e0 kernel/locking/lockdep.c:1827
 check_prev_add kernel/locking/lockdep.c:2496 [inline]
 check_prevs_add kernel/locking/lockdep.c:2601 [inline]
 validate_chain kernel/locking/lockdep.c:3218 [inline]
 __lock_acquire+0x2a96/0x5780 kernel/locking/lockdep.c:4441
 lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5029
 percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
 __sb_start_write+0x228/0x450 fs/super.c:1672
 io_write+0x6b5/0xb30 fs/io_uring.c:3296
 io_issue_sqe+0x18f/0x5c50 fs/io_uring.c:5719
 __io_queue_sqe+0x280/0x1160 fs/io_uring.c:6175
 io_queue_sqe+0x692/0xfa0 fs/io_uring.c:6254
 io_submit_sqe fs/io_uring.c:6324 [inline]
 io_submit_sqes+0x1761/0x2400 fs/io_uring.c:6521
 __do_sys_io_uring_enter+0xeac/0x1bd0 fs/io_uring.c:8349
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e179
Code: 3d b2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 0b b2 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f1194e74c78 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00000000000082c0 RCX: 000000000045e179
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 000000000118cf98 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffd1aa5756f R14: 00007f1194e759c0 R15: 000000000118cf4c

Fix this by just not diving into details if we fail to trylock the
io_uring mutex. We know the ctx isn't going away during this operation,
but we cannot safely iterate buffers/files/personalities if we don't
hold the io_uring mutex.

Reported-by: syzbot+2f8fa4e860edc3066aba@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
8 weeks agoio_uring: always delete double poll wait entry on match
Jens Axboe [Mon, 28 Sep 2020 14:38:54 +0000 (08:38 -0600)]
io_uring: always delete double poll wait entry on match

syzbot reports a crash with tty polling, which is using the double poll
handling:

general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 0 PID: 6874 Comm: syz-executor749 Not tainted 5.9.0-rc6-next-20200924-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:io_poll_get_single fs/io_uring.c:4778 [inline]
RIP: 0010:io_poll_double_wake+0x51/0x510 fs/io_uring.c:4845
Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 9e 03 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5d 08 48 8d 7b 48 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e 63 03 00 00 0f b6 6b 48 bf 06 00 00
RSP: 0018:ffffc90001c1fb70 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000004
RDX: 0000000000000009 RSI: ffffffff81d9b3ad RDI: 0000000000000048
RBP: dffffc0000000000 R08: ffff8880a3cac798 R09: ffffc90001c1fc60
R10: fffff52000383f73 R11: 0000000000000000 R12: 0000000000000004
R13: ffff8880a3cac798 R14: ffff8880a3cac7a0 R15: 0000000000000004
FS:  0000000001f98880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f18886916c0 CR3: 0000000094c5a000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __wake_up_common+0x147/0x650 kernel/sched/wait.c:93
 __wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:123
 tty_ldisc_hangup+0x1cf/0x680 drivers/tty/tty_ldisc.c:735
 __tty_hangup.part.0+0x403/0x870 drivers/tty/tty_io.c:625
 __tty_hangup drivers/tty/tty_io.c:575 [inline]
 tty_vhangup+0x1d/0x30 drivers/tty/tty_io.c:698
 pty_close+0x3f5/0x550 drivers/tty/pty.c:79
 tty_release+0x455/0xf60 drivers/tty/tty_io.c:1679
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:141
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:165 [inline]
 exit_to_user_mode_prepare+0x1e2/0x1f0 kernel/entry/common.c:192
 syscall_exit_to_user_mode+0x7a/0x2c0 kernel/entry/common.c:267
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x401210

which is due to a failure in removing the double poll wait entry if we
hit a wakeup match. This can cause multiple invocations of the wakeup,
which isn't safe.

Cc: stable@vger.kernel.org # v5.8
Reported-by: syzbot+81b3883093f772addf6d@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
8 weeks agoARM: dts: bcm2835: Change firmware compatible from simple-bus to simple-mfd
Maxime Ripard [Thu, 24 Sep 2020 08:26:42 +0000 (10:26 +0200)]
ARM: dts: bcm2835: Change firmware compatible from simple-bus to simple-mfd

The current binding for the RPi firmware uses the simple-bus compatible as
a fallback to benefit from its automatic probing of child nodes.

However, simple-bus also comes with some constraints, like having the ranges,
our case.

Let's switch to simple-mfd that provides the same probing logic without
those constraints.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20200924082642.18144-1-maxime@cerno.tech
Signed-off-by: Rob Herring <robh@kernel.org>
8 weeks agogpio: amd-fch: correct logic of GPIO_LINE_DIRECTION
Ed Wildgoose [Mon, 28 Sep 2020 09:44:52 +0000 (10:44 +0100)]
gpio: amd-fch: correct logic of GPIO_LINE_DIRECTION

The original commit appears to have the logic reversed in
amd_fch_gpio_get_direction. Also confirmed by observing the value of
"direction" in the sys tree.

Signed-off-by: Ed Wildgoose <lists@wildgooses.com>
Fixes: e09d168f13f0 ("gpio: AMD G-Series PCH gpio driver")
Cc: stable@vger.kernel.org
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
8 weeks agommc: sdhci: Workaround broken command queuing on Intel GLK based IRBIS models
Hans de Goede [Sun, 27 Sep 2020 10:48:21 +0000 (12:48 +0200)]
mmc: sdhci: Workaround broken command queuing on Intel GLK based IRBIS models

Commit bedf9fc01ff1 ("mmc: sdhci: Workaround broken command queuing on
Intel GLK"), disabled command-queuing on Intel GLK based LENOVO models
because of it being broken due to what is believed to be a bug in
the BIOS.

It seems that the BIOS of some IRBIS models, including the IRBIS NB111
model has the same issue, so disable command queuing there too.

Fixes: bedf9fc01ff1 ("mmc: sdhci: Workaround broken command queuing on Intel GLK")
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=209397
Reported-and-tested-by: RussianNeuroMancer <russianneuromancer@ya.ru>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20200927104821.5676-1-hdegoede@redhat.com
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
8 weeks agomemstick: Skip allocating card when removing host
Kai-Heng Feng [Fri, 25 Sep 2020 08:49:51 +0000 (16:49 +0800)]
memstick: Skip allocating card when removing host

After commit 6827ca573c03 ("memstick: rtsx_usb_ms: Support runtime power
management"), removing module rtsx_usb_ms will be stuck.

The deadlock is caused by powering on and powering off at the same time,
the former one is when memstick_check() is flushed, and the later is called
by memstick_remove_host().

Soe let's skip allocating card to prevent this issue.

Fixes: 6827ca573c03 ("memstick: rtsx_usb_ms: Support runtime power management")
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Link: https://lore.kernel.org/r/20200925084952.13220-1-kai.heng.feng@canonical.com
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
8 weeks agoLinux 5.9-rc7 v5.9-rc7
Linus Torvalds [Sun, 27 Sep 2020 21:38:10 +0000 (14:38 -0700)]
Linux 5.9-rc7

8 weeks agoMerge tag 'kbuild-fixes-v5.9-4' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 27 Sep 2020 19:18:57 +0000 (12:18 -0700)]
Merge tag 'kbuild-fixes-v5.9-4' of git://git./linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - ignore compiler stubs for PPC to fix builds

 - fix the usage of --target mentioned in the LLVM document

* tag 'kbuild-fixes-v5.9-4' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  Documentation/llvm: Fix clang target examples
  scripts/kallsyms: skip ppc compiler stub *.long_branch.* / *.plt_branch.*

8 weeks agoMerge tag 'x86-urgent-2020-09-27' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 27 Sep 2020 19:15:21 +0000 (12:15 -0700)]
Merge tag 'x86-urgent-2020-09-27' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Thomas Gleixner:
 "Two fixes for the x86 interrupt code:

   - Unbreak the magic 'search the timer interrupt' logic in IO/APIC
     code which got wreckaged when the core interrupt code made the
     state tracking logic stricter.

     That caused the interrupt line to stay masked after switching from
     IO/APIC to PIC delivery mode, which obviously prevents interrupts
     from being delivered.

   - Make run_on_irqstack_code() typesafe. The function argument is a
     void pointer which is then cast to 'void (*fun)(void *).

     This breaks Control Flow Integrity checking in clang. Use proper
     helper functions for the three variants reuqired"

* tag 'x86-urgent-2020-09-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/ioapic: Unbreak check_timer()
  x86/irq: Make run_on_irqstack_cond() typesafe

8 weeks agoMerge tag 'timers-urgent-2020-09-27' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 27 Sep 2020 19:11:35 +0000 (12:11 -0700)]
Merge tag 'timers-urgent-2020-09-27' of git://git./linux/kernel/git/tip/tip

Pull timer updates from Thomas Gleixner:
 "A set of clocksource/clockevents updates:

   - Reset the TI/DM timer before enabling it instead of doing it the
     other way round.

   - Initialize the reload value for the GX6605s timer correctly so the
     hardware counter starts at 0 again after overrun.

   - Make error return value negative in the h8300 timer init function"

* tag 'timers-urgent-2020-09-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  clocksource/drivers/timer-gx6605s: Fixup counter reload
  clocksource/drivers/timer-ti-dm: Do reset before enable
  clocksource/drivers/h8300_timer8: Fix wrong return value in h8300_8timer_init()

8 weeks agomm/thp: Split huge pmds/puds if they're pinned when fork()
Peter Xu [Fri, 25 Sep 2020 22:26:00 +0000 (18:26 -0400)]
mm/thp: Split huge pmds/puds if they're pinned when fork()

Pinned pages shouldn't be write-protected when fork() happens, because
follow up copy-on-write on these pages could cause the pinned pages to
be replaced by random newly allocated pages.

For huge PMDs, we split the huge pmd if pinning is detected.  So that
future handling will be done by the PTE level (with our latest changes,
each of the small pages will be copied).  We can achieve this by let
copy_huge_pmd() return -EAGAIN for pinned pages, so that we'll
fallthrough in copy_pmd_range() and finally land the next
copy_pte_range() call.

Huge PUDs will be even more special - so far it does not support
anonymous pages.  But it can actually be done the same as the huge PMDs
even if the split huge PUDs means to erase the PUD entries.  It'll
guarantee the follow up fault ins will remap the same pages in either
parent/child later.

This might not be the most efficient way, but it should be easy and
clean enough.  It should be fine, since we're tackling with a very rare
case just to make sure userspaces that pinned some thps will still work
even without MADV_DONTFORK and after they fork()ed.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 weeks agomm: Do early cow for pinned pages during fork() for ptes
Peter Xu [Fri, 25 Sep 2020 22:25:59 +0000 (18:25 -0400)]
mm: Do early cow for pinned pages during fork() for ptes

This allows copy_pte_range() to do early cow if the pages were pinned on
the source mm.

Currently we don't have an accurate way to know whether a page is pinned
or not.  The only thing we have is page_maybe_dma_pinned().  However
that's good enough for now.  Especially, with the newly added
mm->has_pinned flag to make sure we won't affect processes that never
pinned any pages.

It would be easier if we can do GFP_KERNEL allocation within
copy_one_pte().  Unluckily, we can't because we're with the page table
locks held for both the parent and child processes.  So the page
allocation needs to be done outside copy_one_pte().

Some trick is there in copy_present_pte(), majorly the wrprotect trick
to block concurrent fast-gup.  Comments in the function should explain
better in place.

Oleg Nesterov reported a (probably harmless) bug during review that we
didn't reset entry.val properly in copy_pte_range() so that potentially
there's chance to call add_swap_count_continuation() multiple times on
the same swp entry.  However that should be harmless since even if it
happens, the same function (add_swap_count_continuation()) will return
directly noticing that there're enough space for the swp counter.  So
instead of a standalone stable patch, it is touched up in this patch
directly.

Link: https://lore.kernel.org/lkml/20200914143829.GA1424636@nvidia.com/
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 weeks agomm/fork: Pass new vma pointer into copy_page_range()
Peter Xu [Fri, 25 Sep 2020 22:25:58 +0000 (18:25 -0400)]
mm/fork: Pass new vma pointer into copy_page_range()

This prepares for the future work to trigger early cow on pinned pages
during fork().

No functional change intended.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 weeks agomm: Introduce mm_struct.has_pinned
Peter Xu [Fri, 25 Sep 2020 22:25:57 +0000 (18:25 -0400)]
mm: Introduce mm_struct.has_pinned

(Commit message majorly collected from Jason Gunthorpe)

Reduce the chance of false positive from page_maybe_dma_pinned() by
keeping track if the mm_struct has ever been used with pin_user_pages().
This allows cases that might drive up the page ref_count to avoid any
penalty from handling dma_pinned pages.

Future work is planned, to provide a more sophisticated solution, likely
to turn it into a real counter.  For now, make it atomic_t but use it as
a boolean for simplicity.

Suggested-by: Jason Gunthorpe <jgg@ziepe.ca>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 weeks agoi2c: npcm7xx: Clear LAST bit after a failed transaction.
Tali Perry [Sun, 20 Sep 2020 20:48:09 +0000 (23:48 +0300)]
i2c: npcm7xx: Clear LAST bit after a failed transaction.

Due to a HW issue, in some scenarios the LAST bit might remain set.
This will cause an unexpected NACK after reading 16 bytes on the next
read.

Example: if user tries to read from a missing device, get a NACK,
then if the next command is a long read ( > 16 bytes),
the master will stop reading after 16 bytes.
To solve this, if a command fails, check if LAST bit is still
set. If it does, reset the module.

Fixes: 56a1485b102e (i2c: npcm7xx: Add Nuvoton NPCM I2C controller driver)
Signed-off-by: Tali Perry <tali.perry1@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
8 weeks agoi2c: cpm: Fix i2c_ram structure
Nicolas VINCENT [Wed, 23 Sep 2020 14:08:40 +0000 (16:08 +0200)]
i2c: cpm: Fix i2c_ram structure

the i2c_ram structure is missing the sdmatmp field mentionned in
datasheet for MPC8272 at paragraph 36.5. With this field missing, the
hardware would write past the allocated memory done through
cpm_muram_alloc for the i2c_ram structure and land in memory allocated
for the buffers descriptors corrupting the cbd_bufaddr field. Since this
field is only set during setup(), the first i2c transaction would work
and the following would send data read from an arbitrary memory
location.

Fixes: 61045dbe9d8d ("i2c: Add support for I2C bus on Freescale CPM1/CPM2 controllers")
Signed-off-by: Nicolas VINCENT <nicolas.vincent@vossloh.com>
Acked-by: Jochen Friedrich <jochen@scram.de>
Acked-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
8 weeks agoMerge tag 'timers-v5.9-rc4' of https://git.linaro.org/people/daniel.lezcano/linux...
Thomas Gleixner [Sun, 27 Sep 2020 09:24:34 +0000 (11:24 +0200)]
Merge tag 'timers-v5.9-rc4' of https://git.linaro.org/people/daniel.lezcano/linux into timers/urgent

Pull clocksource/clockevent fixes from Daniel Lezcano:

 - Fix wrong signed return value when checking of_iomap in the probe
   function for the h8300 timer (Tianjia Zhang)

 - Fix reset sequence when setting up the timer on the dm_timer (Tony
   Lindgren)

 - Fix counter reload when the interrupt fires on gx6605s (Guo Ren)

8 weeks agoMerge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Linus Torvalds [Sat, 26 Sep 2020 18:18:37 +0000 (11:18 -0700)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "Three fixes: one in drivers (lpfc) and two for zoned block devices.

  The latter also impinges on the block layer but only to introduce a
  new block API for setting the zone model rather than fiddling with the
  queue directly in the zoned block driver"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: sd: sd_zbc: Fix ZBC disk initialization
  scsi: sd: sd_zbc: Fix handling of host-aware ZBC disks
  scsi: lpfc: Fix initial FLOGI failure due to BBSCN not supported

8 weeks agoMerge tag 'io_uring-5.9-2020-09-25' of git://git.kernel.dk/linux-block
Linus Torvalds [Sat, 26 Sep 2020 18:13:51 +0000 (11:13 -0700)]
Merge tag 'io_uring-5.9-2020-09-25' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:
 "Two fixes for regressions in this cycle, and one that goes to 5.8
  stable:

   - fix leak of getname() retrieved filename

   - remove plug->nowait assignment, fixing a regression with btrfs

   - fix for async buffered retry"

* tag 'io_uring-5.9-2020-09-25' of git://git.kernel.dk/linux-block:
  io_uring: ensure async buffered read-retry is setup properly
  io_uring: don't unconditionally set plug->nowait = true
  io_uring: ensure open/openat2 name is cleaned on cancelation

8 weeks agoMerge tag 'block-5.9-2020-09-25' of git://git.kernel.dk/linux-block
Linus Torvalds [Sat, 26 Sep 2020 18:07:36 +0000 (11:07 -0700)]
Merge tag 'block-5.9-2020-09-25' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "NVMe pull request from Christoph, and removal of a dead define.

   - fix error during controller probe that cause double free irqs
     (Keith Busch)

   - FC connection establishment fix (James Smart)

   - properly handle completions for invalid tags (Xianting Tian)

   - pass the correct nsid to the command effects and supported log
     (Chaitanya Kulkarni)"

* tag 'block-5.9-2020-09-25' of git://git.kernel.dk/linux-block:
  block: remove unused BLK_QC_T_EAGAIN flag
  nvme-core: don't use NVME_NSID_ALL for command effects and supported log
  nvme-fc: fail new connections to a deleted host or remote port
  nvme-pci: fix NULL req in completion handler
  nvme: return errors for hwmon init

8 weeks agoMerge tag 's390-5.9-7' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Linus Torvalds [Sat, 26 Sep 2020 18:01:18 +0000 (11:01 -0700)]
Merge tag 's390-5.9-7' of git://git./linux/kernel/git/s390/linux

Pull s390 fix from Vasily Gorbik:
 "Fix truncated ZCRYPT_PERDEV_REQCNT ioctl result. Copy entire reqcnt
  list"

* tag 's390-5.9-7' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/zcrypt: Fix ZCRYPT_PERDEV_REQCNT ioctl