From e18378a60e27ad7b3e11ecc4e2c92159585dee68 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Tue, 20 Oct 2015 23:13:54 +0800 Subject: [PATCH] blk-mq: check bio_mergeable() early before merging It isn't necessary to try to merge the bio which is marked as NOMERGE. Reviewed-by: Jeff Moyer Signed-off-by: Ming Lei Signed-off-by: Jens Axboe --- block/blk-mq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 9683a561efcd..d38371160019 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1140,7 +1140,7 @@ static inline bool blk_mq_merge_queue_io(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, struct request *rq, struct bio *bio) { - if (!hctx_allow_merges(hctx)) { + if (!hctx_allow_merges(hctx) || !bio_mergeable(bio)) { blk_mq_bio_to_request(rq, bio); spin_lock(&ctx->lock); insert_rq: -- 2.30.2