From 3ee3237239583a6555db4f297d00eebdbb6d76ad Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 9 Jun 2014 09:36:53 -0600 Subject: [PATCH] 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 --- block/blk-mq.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index fafea52..a5ea37d 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, -- 2.7.4