block: properly protect the 'queue' kobj in blk_unregister_queue

The original commit e9a823fb34a8b (block: fix warning when I/O elevator
is changed as request_queue is being removed) is pretty conflated.
"conflated" because the resource being protected by q->sysfs_lock isn't
the queue_flags (it is the 'queue' kobj).

q->sysfs_lock serializes __elevator_change() (via elv_iosched_store)
from racing with blk_unregister_queue():
1) By holding q->sysfs_lock first, __elevator_change() can complete
before a racing blk_unregister_queue().
2) Conversely, __elevator_change() is testing for QUEUE_FLAG_REGISTERED
in case elv_iosched_store() loses the race with blk_unregister_queue(),
it needs a way to know the 'queue' kobj isn't there.

Expand the scope of blk_unregister_queue()'s q->sysfs_lock use so it is
held until after the 'queue' kobj is removed.

To do so blk_mq_unregister_dev() must not also take q->sysfs_lock.  So
rename __blk_mq_unregister_dev() to blk_mq_unregister_dev().

Also, blk_unregister_queue() should use q->queue_lock to protect against
any concurrent writes to q->queue_flags -- even though chances are the
queue is being cleaned up so no concurrent writes are likely.

Fixes: e9a823fb34a8b ("block: fix warning when I/O elevator is changed as request_queue is being removed")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 10 insertions, 3 deletions

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 870484eaed1f..9272452ff456 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -929,12 +929,17 @@ void blk_unregister_queue(struct gendisk *disk)
         if (WARN_ON(!q))
                 return;
 
+        /*
+         * Protect against the 'queue' kobj being accessed
+         * while/after it is removed.
+         */
         mutex_lock(&q->sysfs_lock);
-        queue_flag_clear_unlocked(QUEUE_FLAG_REGISTERED, q);
-        mutex_unlock(&q->sysfs_lock);
 
-        wbt_exit(q);
+        spin_lock_irq(q->queue_lock);
+        queue_flag_clear(QUEUE_FLAG_REGISTERED, q);
+        spin_unlock_irq(q->queue_lock);
 
+        wbt_exit(q);
 
         if (q->mq_ops)
                 blk_mq_unregister_dev(disk_to_dev(disk), q);
@@ -946,4 +951,6 @@ void blk_unregister_queue(struct gendisk *disk)
         kobject_del(&q->kobj);
         blk_trace_remove_sysfs(disk_to_dev(disk));
         kobject_put(&disk_to_dev(disk)->kobj);
+
+        mutex_unlock(&q->sysfs_lock);
 }