linux-kernel - Re: [PATCH] mm/backing-dev.c: fix an error handling path in 'cgwb

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Date:   Mon, 11 Sep 2017 22:15:06 +0200
From:   Jan Kara <jack@...e.cz>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     axboe@...com, jack@...e.cz, tj@...nel.org, geliangtang@...il.com,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] mm/backing-dev.c: fix an error handling path in
 'cgwb_create()'

On Mon 11-09-17 21:43:23, Christophe JAILLET wrote:
> If the 'kmalloc' fails, we must go through the existing error handling
> path.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Looks good to me. You can add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  mm/backing-dev.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index f028a9a472fd..e19606bb41a0 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -569,8 +569,10 @@ static int cgwb_create(struct backing_dev_info *bdi,
>  
>  	/* need to create a new one */
>  	wb = kmalloc(sizeof(*wb), gfp);
> -	if (!wb)
> -		return -ENOMEM;
> +	if (!wb) {
> +		ret = -ENOMEM;
> +		goto out_put;
> +	}
>  
>  	ret = wb_init(wb, bdi, blkcg_css->id, gfp);
>  	if (ret)
> -- 
> 2.11.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR