linux-kernel - Re: [PATCH 1/2] blk-mq: don't complete un-started request in timeout handler

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Date:   Thu, 16 Mar 2017 21:37:23 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hch@...radead.org" <hch@...radead.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "tom.leiming@...il.com" <tom.leiming@...il.com>,
        "axboe@...com" <axboe@...com>
CC:     "yizhan@...hat.com" <yizhan@...hat.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 1/2] blk-mq: don't complete un-started request in
 timeout handler

On Thu, 2017-03-09 at 21:02 +0800, Ming Lei wrote:
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index 159187a28d66..0aff380099d5 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -697,17 +697,8 @@ static void blk_mq_check_expired(struct blk_mq_hw_ctx *hctx,
>  {
>  	struct blk_mq_timeout_data *data = priv;
>  
> -	if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) {
> -		/*
> -		 * If a request wasn't started before the queue was
> -		 * marked dying, kill it here or it'll go unnoticed.
> -		 */
> -		if (unlikely(blk_queue_dying(rq->q))) {
> -			rq->errors = -EIO;
> -			blk_mq_end_request(rq, rq->errors);
> -		}
> +	if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags))
>  		return;
> -	}
>  
>  	if (time_after_eq(jiffies, rq->deadline)) {
>  		if (!blk_mark_rq_complete(rq))

Reviewed-by: Bart Van Assche <bart.vanassche@...disk.com>