diff --git a/block/blk-mq.c b/block/blk-mq.c
index 36abbaefe387..3f1f7d0b3ff3 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2753,6 +2753,7 @@ static void blk_mq_dispatch_plug_list(struct blk_plug *plug, bool from_sched)
 void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule)
 {
 	struct request *rq;
+	unsigned int depth;
 
 	/*
 	 * We may have been called recursively midway through handling
@@ -2763,6 +2764,7 @@ void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule)
 	 */
 	if (plug->rq_count == 0)
 		return;
+	depth = plug->rq_count;
 	plug->rq_count = 0;
 
 	if (!plug->multiple_queues && !plug->has_elevator && !from_schedule) {
@@ -2770,6 +2772,7 @@ void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule)
 
 		rq = rq_list_peek(&plug->mq_list);
 		q = rq->q;
+		trace_block_unplug(q, depth, true);
 
 		/*
 		 * Peek first request and see if we have a ->queue_rqs() hook.