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blk-mq: fix initializing request's start time

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blk_rq_init() is called in req's complete handler to initialize
the request, so the members of start_time and start_time_ns might
become inaccurate when it is allocated in future.

The patch initializes the two members in blk_mq_rq_ctx_init() to
fix the problem.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2014-01-03 10:00:08 -07:00 committed by Jens Axboe
parent 3edcc0ce85
commit 0fec08b4ec
1 changed files with 2 additions and 0 deletions
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2
block/blk-mq.c
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@ -190,6 +190,8 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
rq->mq_ctx = ctx;
rq->cmd_flags = rw_flags;
rq->start_time = jiffies;
set_start_time_ns(rq);
ctx->rq_dispatched[rw_is_sync(rw_flags)]++;
}