linux-kernel - Re: [PATCH] block:Add proper error handling to the function, disk_add

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Date:	Thu, 14 May 2015 21:22:22 -0400
From:	Jens Axboe <axboe@...nel.dk>
To:	Nicholas Krause <xerofoify@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block:Add proper error handling to the function, disk_add_events

On 05/14/2015 07:57 PM, Nicholas Krause wrote:
> This adds the proper required error checking to the function,
> disk_add_events for  when there are no disk events by returning
> the error code, -EBUSY. Further this also adds error checking
> for when our call to the function, sysfs_create_files by making
> this function's return now go into a newly declared variable,
> ret and at the end of this function's body return it to indicate
> whether this function is successful or not to the caller.
>
> Signed-off-by: Nicholas Krause <xerofoify@...il.com>
> ---
>   block/genhd.c | 13 +++++++++----
>   1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/block/genhd.c b/block/genhd.c
> index 0a536dc..3eb7ee9 100644
> --- a/block/genhd.c
> +++ b/block/genhd.c
> @@ -1803,15 +1803,19 @@ static void disk_alloc_events(struct gendisk *disk)
>   	disk->ev = ev;
>   }
>
> -static void disk_add_events(struct gendisk *disk)
> +static int disk_add_events(struct gendisk *disk)
>   {
> +	int ret = 0;
>   	if (!disk->ev)
> -		return;
> +		return -EBUSY;
> +
> +	ret = sysfs_create_files(&disk_to_dev(disk)->kobj, disk_events_attrs)
>
> -	/* FIXME: error handling */
> -	if (sysfs_create_files(&disk_to_dev(disk)->kobj, disk_events_attrs) < 0)
> +	if (!ret) {
>   		pr_warn("%s: failed to create sysfs files for events\n",
>   			disk->disk_name);
> +		return ret;
> +	}

You didn't even test this, obviously.

-- 
Jens Axboe

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