diff --git a/block/blk-mq.c b/block/blk-mq.c
index da1ab5641227..bfe0f1f9cfa0 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -258,8 +258,10 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp,
 		ctx = alloc_data.ctx;
 	}
 	blk_mq_put_ctx(ctx);
-	if (!rq)
+	if (!rq) {
+		blk_mq_queue_exit(q);
 		return ERR_PTR(-EWOULDBLOCK);
+	}
 	return rq;
 }
 EXPORT_SYMBOL(blk_mq_alloc_request);