diff --git a/block/blk-core.c b/block/blk-core.c
index 3a9944ddee3a4b379d134358fd52cbcb4fda932a..a3213e527008fdf0382d7b256d2b210424b24604 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1814,7 +1814,6 @@ bool bio_attempt_back_merge(struct request_queue *q, struct request *req,
 	req->biotail->bi_next = bio;
 	req->biotail = bio;
 	req->__data_len += bio->bi_iter.bi_size;
-	req->ioprio = ioprio_best(req->ioprio, bio_prio(bio));
 
 	blk_account_io_start(req, false);
 	return true;
@@ -1838,7 +1837,6 @@ bool bio_attempt_front_merge(struct request_queue *q, struct request *req,
 
 	req->__sector = bio->bi_iter.bi_sector;
 	req->__data_len += bio->bi_iter.bi_size;
-	req->ioprio = ioprio_best(req->ioprio, bio_prio(bio));
 
 	blk_account_io_start(req, false);
 	return true;
@@ -1858,7 +1856,6 @@ bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
 	req->biotail->bi_next = bio;
 	req->biotail = bio;
 	req->__data_len += bio->bi_iter.bi_size;
-	req->ioprio = ioprio_best(req->ioprio, bio_prio(bio));
 	req->nr_phys_segments = segments + 1;
 
 	blk_account_io_start(req, false);
diff --git a/block/blk-merge.c b/block/blk-merge.c
index d24a6c9398ed80767fe379ad88b7d9c096134b6e..7904e45fc5c62f5496b5c7408f379f6aefd6722c 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -727,6 +727,9 @@ static struct request *attempt_merge(struct request_queue *q,
 	if (req->write_hint != next->write_hint)
 		return NULL;
 
+	if (req->ioprio != next->ioprio)
+		return NULL;
+
 	/*
 	 * If we are allowed to merge, then append bio list
 	 * from next to rq and release next. merge_requests_fn
@@ -782,7 +785,6 @@ static struct request *attempt_merge(struct request_queue *q,
 	 */
 	blk_account_io_merge(next);
 
-	req->ioprio = ioprio_best(req->ioprio, next->ioprio);
 	if (blk_rq_cpu_valid(next))
 		req->cpu = next->cpu;
 
@@ -865,6 +867,9 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
 	if (rq->write_hint != bio->bi_write_hint)
 		return false;
 
+	if (rq->ioprio != bio_prio(bio))
+		return false;
+
 	return true;
 }