Avoid to access .bi_vcnt directly, because the bio can be
splitted from block layer, and .bi_vcnt should never have
been used here.
Signed-off-by: Ming Lei <tom.leiming@xxxxxxxxx>
---
drivers/md/dm-rq.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index b2a9e2d161e4..d9cc8324e597 100644
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -797,8 +797,13 @@ static void dm_old_request_fn(struct request_queue *q)
if (req_op(rq) != REQ_OP_FLUSH)
pos = blk_rq_pos(rq);
+ /*
+ * bio can be splitted from block layer, so use
+ * !bio_multiple_segments instead of 'bio->bi_vcnt == 1'
+ */
if ((dm_old_request_peeked_before_merge_deadline(md) &&
- md_in_flight(md) && rq->bio && rq->bio->bi_vcnt == 1 &&
+ md_in_flight(md) && rq->bio &&
+ !bio_multiple_segments(rq->bio) &&
md->last_rq_pos == pos && md->last_rq_rw == rq_data_dir(rq)) ||
(ti->type->busy && ti->type->busy(ti))) {
blk_delay_queue(q, 10);
--
2.7.4
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