linux-kernel - Re: [PATCH 2/2] blk-mq: Fix request handover from timeout path to normal execution

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Message-ID: <20180402211047.GF388343@devbig577.frc2.facebook.com>
Date:   Mon, 2 Apr 2018 14:10:47 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Bart Van Assche <bart.vanassche@....com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 2/2] blk-mq: Fix request handover from timeout path to
 normal execution

On Mon, Apr 02, 2018 at 02:08:37PM -0700, Bart Van Assche wrote:
> On 04/02/18 12:01, Tejun Heo wrote:
> >+	 * As nothing prevents from completion happening while
> >+	 * ->aborted_gstate is set, this may lead to ignored completions
> >+	 * and further spurious timeouts.
> >+	 */
> >+	if (rq->rq_flags & RQF_MQ_TIMEOUT_RESET)
> >+		blk_mq_rq_update_aborted_gstate(rq, 0);
> 
> Hello Tejun,
> 
> Since this patch fixes one race but introduces another race, is this
> patch really an improvement?

Oh, that's not a new race.  That's the same non-critical race which
always existed.  It's just being documented.

Thanks.

-- 
tejun