linux-kernel - [PATCH 3.13 048/187] blk-mq: fix initializing request's start time

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Message-Id: <1410818997-9432-49-git-send-email-kamal@canonical.com>
Date:	Mon, 15 Sep 2014 15:07:38 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Ming Lei <tom.leiming@...il.com>, Jens Axboe <axboe@...nel.dk>,
	Chris J Arges <chris.j.arges@...onical.com>,
	Tim Gardner <tim.gardner@...onical.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 048/187] blk-mq: fix initializing request's start time

3.13.11.7 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ming Lei <tom.leiming@...il.com>

commit 0fec08b4ecfc36fd8a64432343b2964fb86d2675 upstream.

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@...il.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Cc: Chris J Arges <chris.j.arges@...onical.com>
Cc: Tim Gardner <tim.gardner@...onical.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 block/blk-mq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 7f9b1f6..2192cf4 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -179,6 +179,8 @@ 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)]++;
 }
 
-- 
1.9.1

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