diff --git a/block/blk-mq.c b/block/blk-mq.c
index 28c2d931e75e..a24175441380 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -3246,7 +3246,7 @@ void blk_mq_submit_bio(struct bio *bio)
 	if (!rq)
 		blk_queue_exit(q);
 	else
-		blk_mq_free_request(rq);
+		rq_list_add_head(&plug->cached_rqs, rq);
 }
 
 #ifdef CONFIG_BLK_MQ_STACKING