linux-kernel - Re: [PATCH 1/7] blk-mq: fix use of incorrect goto label in blk_mq_init

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Message-ID: <CACVXFVN7zpb3+wcOdsa5yyrRJ-EDw7EcMNJOao45UgRZO3rpcQ@mail.gmail.com>
Date:	Thu, 12 Mar 2015 15:48:32 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Keith Busch <keith.busch@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	dm-devel@...hat.com
Subject: Re: [PATCH 1/7] blk-mq: fix use of incorrect goto label in
 blk_mq_init_queue error path

On Thu, Mar 12, 2015 at 11:56 AM, Mike Snitzer <snitzer@...hat.com> wrote:
> If percpu_ref_init() fails the 'err_hctxs' label should be used instead
> of 'err_map'.
>
> Signed-off-by: Mike Snitzer <snitzer@...hat.com>
> ---
>  block/blk-mq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index 4f4bea2..459840c 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -1938,7 +1938,7 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
>          */
>         if (percpu_ref_init(&q->mq_usage_counter, blk_mq_usage_counter_release,
>                             PERCPU_REF_INIT_ATOMIC, GFP_KERNEL))
> -               goto err_map;
> +               goto err_hctxs;

If it is changed to 'goto err_hctxs', percpu_ref_init() need to
move before blk_alloc_queue_node(), otherwise just 'goto err_hw'
is enough, but the former is better.

Thanks,
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