1 files changed, 16 insertions, 2 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index bc5e8c5eaac9..09d10bb95fda 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -261,6 +261,8 @@ static void blk_free_queue(struct request_queue *q)
 		blk_mq_release(q);
 
 	ida_free(&blk_queue_ida, q->id);
+	lockdep_unregister_key(&q->io_lock_cls_key);
+	lockdep_unregister_key(&q->q_lock_cls_key);
 	call_rcu(&q->rcu_head, blk_free_queue_rcu);
 }
 
@@ -278,18 +280,20 @@ void blk_put_queue(struct request_queue *q)
 }
 EXPORT_SYMBOL(blk_put_queue);
 
-void blk_queue_start_drain(struct request_queue *q)
+bool blk_queue_start_drain(struct request_queue *q)
 {
 	/*
 	 * When queue DYING flag is set, we need to block new req
 	 * entering queue, so we call blk_freeze_queue_start() to
 	 * prevent I/O from crossing blk_queue_enter().
 	 */
-	blk_freeze_queue_start(q);
+	bool freeze = __blk_freeze_queue_start(q);
 	if (queue_is_mq(q))
 		blk_mq_wake_waiters(q);
 	/* Make blk_queue_enter() reexamine the DYING flag. */
 	wake_up_all(&q->mq_freeze_wq);
+
+	return freeze;
 }
 
 /**
@@ -321,6 +325,8 @@ int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags)
 			return -ENODEV;
 	}
 
+	rwsem_acquire_read(&q->q_lockdep_map, 0, 0, _RET_IP_);
+	rwsem_release(&q->q_lockdep_map, _RET_IP_);
 	return 0;
 }
 
@@ -352,6 +358,8 @@ int __bio_queue_enter(struct request_queue *q, struct bio *bio)
 			goto dead;
 	}
 
+	rwsem_acquire_read(&q->io_lockdep_map, 0, 0, _RET_IP_);
+	rwsem_release(&q->io_lockdep_map, _RET_IP_);
 	return 0;
 dead:
 	bio_io_error(bio);
@@ -441,6 +449,12 @@ struct request_queue *blk_alloc_queue(struct queue_limits *lim, int node_id)
 				PERCPU_REF_INIT_ATOMIC, GFP_KERNEL);
 	if (error)
 		goto fail_stats;
+	lockdep_register_key(&q->io_lock_cls_key);
+	lockdep_register_key(&q->q_lock_cls_key);
+	lockdep_init_map(&q->io_lockdep_map, "&q->q_usage_counter(io)",
+			 &q->io_lock_cls_key, 0);
+	lockdep_init_map(&q->q_lockdep_map, "&q->q_usage_counter(queue)",
+			 &q->q_lock_cls_key, 0);
 
 	q->nr_requests = BLKDEV_DEFAULT_RQ;