From: Jens Axboe Date: Mon, 9 Jun 2014 15:36:53 +0000 (-0600) Subject: blk-mq: always initialize request->start_time X-Git-Tag: v3.16-rc1~47^2~4 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=3ee3237239583a6555db4f297d00eebdbb6d76ad;p=linux-2.6-block.git blk-mq: always initialize request->start_time The blk-mq core only initializes this if io stats are enabled, since blk-mq only reads the field in that case. But drivers could potentially use it internally, so ensure that we always set it to the current time when the request is allocated. Reported-by: Ming Lei Signed-off-by: Jens Axboe --- diff --git a/block/blk-mq.c b/block/blk-mq.c index fafea52281ac..a5ea37d7e820 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -185,6 +185,7 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx, RB_CLEAR_NODE(&rq->rb_node); rq->rq_disk = NULL; rq->part = NULL; + rq->start_time = jiffies; #ifdef CONFIG_BLK_CGROUP rq->rl = NULL; set_start_time_ns(rq); @@ -1104,10 +1105,8 @@ static void blk_mq_bio_to_request(struct request *rq, struct bio *bio) { init_request_from_bio(rq, bio); - if (blk_do_io_stat(rq)) { - rq->start_time = jiffies; + if (blk_do_io_stat(rq)) blk_account_io_start(rq, 1); - } } static inline bool blk_mq_merge_queue_io(struct blk_mq_hw_ctx *hctx,