1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 194580fba7fd..14d3b37944df 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -284,6 +284,8 @@ static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
          * go away inside make_request
          */
         sectors = bio_sectors(bio);
+        /* bio could be mergeable after passing to underlayer */
+        bio->bi_rw &= ~REQ_NOMERGE;
         mddev->pers->make_request(mddev, bio);
 
         cpu = part_stat_lock();