diff --git a/block/blk-merge.c b/block/blk-merge.c
index 7497d86fff38..c3399bf29e9c 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -279,6 +279,14 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
 	return NULL;
 split:
 	*segs = nsegs;
+
+	/*
+	 * Bio splitting may cause subtle trouble such as hang when doing sync
+	 * iopoll in direct IO routine. Given performance gain of iopoll for
+	 * big IO can be trival, disable iopoll when split needed.
+	 */
+	bio->bi_opf &= ~REQ_HIPRI;
+
 	return bio_split(bio, sectors, GFP_NOIO, bs);
 }
 
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 2881a457de83..95ecc4c69969 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2159,6 +2159,7 @@ blk_qc_t blk_mq_submit_bio(struct bio *bio)
 	unsigned int nr_segs;
 	blk_qc_t cookie;
 	blk_status_t ret;
+	bool hipri;
 
 	blk_queue_bounce(q, &bio);
 	__blk_queue_split(&bio, &nr_segs);
@@ -2175,6 +2176,8 @@ blk_qc_t blk_mq_submit_bio(struct bio *bio)
 
 	rq_qos_throttle(q, bio);
 
+	hipri = bio->bi_opf & REQ_HIPRI;
+
 	data.cmd_flags = bio->bi_opf;
 	rq = __blk_mq_alloc_request(&data);
 	if (unlikely(!rq)) {
@@ -2267,6 +2270,8 @@ blk_qc_t blk_mq_submit_bio(struct bio *bio)
 		blk_mq_sched_insert_request(rq, false, true, true);
 	}
 
+	if (!hipri)
+		return BLK_QC_T_NONE;
 	return cookie;
 queue_exit:
 	blk_queue_exit(q);