rbd: unfreeze queue after marking disk as dead

Unfreeze queue after returning from blk_mark_disk_dead(), this way at
least allows us to verify queue freeze correctly with lockdep.

Suggested-by: Christoph Hellwig <[email protected]>
Cc: Ilya Dryomov <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: Ming Lei

drivers/block/rbd.c

@@ -7284,6 +7284,7 @@ static ssize_t do_rbd_remove(const char *buf, size_t count)
 		 */
 		blk_mq_freeze_queue(rbd_dev->disk->queue);
 		blk_mark_disk_dead(rbd_dev->disk);
+		blk_mq_unfreeze_queue(rbd_dev->disk->queue);
 	}
 
 	del_gendisk(rbd_dev->disk);