* [PATCH 2/3] block: Check bio can merge before call attempt_plug_merge.
@ 2013-10-30 2:41 majianpeng
0 siblings, 0 replies; only message in thread
From: majianpeng @ 2013-10-30 2:41 UTC (permalink / raw)
To: axboe, NeilBrown; +Cc: LKML, linux-raid
Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
---
block/blk-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 0a00e4e..fb970fd 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1492,7 +1492,7 @@ void blk_queue_bio(struct request_queue *q, struct bio *bio)
* Check if we can merge with the plugged list before grabbing
* any locks.
*/
- if (attempt_plug_merge(q, bio, &request_count))
+ if (likely(bio_mergeable(bio)) && attempt_plug_merge(q, bio, &request_count))
return;
spin_lock_irq(q->queue_lock);
--
1.8.4
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