Merge branch 'nvme-4.18' of git://git.infradead.org/nvme into for-linus
[muen/linux.git] / drivers / nvme / host / core.c
index effb1309682eb2564d77a5550526510cb891b7bd..21710a7460c823bbc4f84134d7ecce70d3f993ba 100644 (file)
@@ -2208,7 +2208,7 @@ static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
                 * Verify that the subsystem actually supports multiple
                 * controllers, else bail out.
                 */
-               if (!ctrl->opts->discovery_nqn &&
+               if (!(ctrl->opts && ctrl->opts->discovery_nqn) &&
                    nvme_active_ctrls(found) && !(id->cmic & (1 << 1))) {
                        dev_err(ctrl->device,
                                "ignoring ctrl due to duplicate subnqn (%s).\n",
@@ -3197,40 +3197,28 @@ static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
        nvme_remove_invalid_namespaces(ctrl, nn);
 }
 
-static bool nvme_scan_changed_ns_log(struct nvme_ctrl *ctrl)
+static void nvme_clear_changed_ns_log(struct nvme_ctrl *ctrl)
 {
        size_t log_size = NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32);
        __le32 *log;
-       int error, i;
-       bool ret = false;
+       int error;
 
        log = kzalloc(log_size, GFP_KERNEL);
        if (!log)
-               return false;
+               return;
 
+       /*
+        * We need to read the log to clear the AEN, but we don't want to rely
+        * on it for the changed namespace information as userspace could have
+        * raced with us in reading the log page, which could cause us to miss
+        * updates.
+        */
        error = nvme_get_log(ctrl, NVME_LOG_CHANGED_NS, log, log_size);
-       if (error) {
+       if (error)
                dev_warn(ctrl->device,
                        "reading changed ns log failed: %d\n", error);
-               goto out_free_log;
-       }
-
-       if (log[0] == cpu_to_le32(0xffffffff))
-               goto out_free_log;
-
-       for (i = 0; i < NVME_MAX_CHANGED_NAMESPACES; i++) {
-               u32 nsid = le32_to_cpu(log[i]);
 
-               if (nsid == 0)
-                       break;
-               dev_info(ctrl->device, "rescanning namespace %d.\n", nsid);
-               nvme_validate_ns(ctrl, nsid);
-       }
-       ret = true;
-
-out_free_log:
        kfree(log);
-       return ret;
 }
 
 static void nvme_scan_work(struct work_struct *work)
@@ -3246,9 +3234,8 @@ static void nvme_scan_work(struct work_struct *work)
        WARN_ON_ONCE(!ctrl->tagset);
 
        if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) {
-               if (nvme_scan_changed_ns_log(ctrl))
-                       goto out_sort_namespaces;
                dev_info(ctrl->device, "rescanning namespaces.\n");
+               nvme_clear_changed_ns_log(ctrl);
        }
 
        if (nvme_identify_ctrl(ctrl, &id))
@@ -3263,7 +3250,6 @@ static void nvme_scan_work(struct work_struct *work)
        nvme_scan_ns_sequential(ctrl, nn);
 out_free_id:
        kfree(id);
-out_sort_namespaces:
        down_write(&ctrl->namespaces_rwsem);
        list_sort(NULL, &ctrl->namespaces, ns_cmp);
        up_write(&ctrl->namespaces_rwsem);
@@ -3641,16 +3627,6 @@ void nvme_start_queues(struct nvme_ctrl *ctrl)
 }
 EXPORT_SYMBOL_GPL(nvme_start_queues);
 
-int nvme_reinit_tagset(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set)
-{
-       if (!ctrl->ops->reinit_request)
-               return 0;
-
-       return blk_mq_tagset_iter(set, set->driver_data,
-                       ctrl->ops->reinit_request);
-}
-EXPORT_SYMBOL_GPL(nvme_reinit_tagset);
-
 int __init nvme_core_init(void)
 {
        int result = -ENOMEM;