linux-kernel - Re: [PATCH v1 7/8] null_blk: add error handling support for add

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Date:   Wed, 12 May 2021 17:16:39 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Luis Chamberlain <mcgrof@...nel.org>, axboe@...nel.dk
Cc:     bvanassche@....org, ming.lei@...hat.com, hch@...radead.org,
        jack@...e.cz, osandov@...com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 7/8] null_blk: add error handling support for
 add_disk()

On 5/12/21 8:46 AM, Luis Chamberlain wrote:
> We never checked for errors on add_disk() as this function
> returned void. Now that this is fixed, use the shiny new
> error handling.
> 
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> ---
>   drivers/block/null_blk/main.c | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
> index 5f006d9e1472..2346d1292b26 100644
> --- a/drivers/block/null_blk/main.c
> +++ b/drivers/block/null_blk/main.c
> @@ -1699,6 +1699,7 @@ static int init_driver_queues(struct nullb *nullb)
>   
>   static int null_gendisk_register(struct nullb *nullb)
>   {
> +	int ret;
>   	sector_t size = ((sector_t)nullb->dev->size * SZ_1M) >> SECTOR_SHIFT;
>   	struct gendisk *disk;
>   
> @@ -1719,13 +1720,17 @@ static int null_gendisk_register(struct nullb *nullb)
>   	strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN);
>   
>   	if (nullb->dev->zoned) {
> -		int ret = null_register_zoned_dev(nullb);
> +		ret = null_register_zoned_dev(nullb);
>   
>   		if (ret)
>   			return ret;
>   	}
>   
> -	add_disk(disk);
> +	ret = add_disk(disk);
> +	if (ret) {

unregister_zoned_device() ?

> +		put_disk(disk);
> +		return ret;
> +	}
>   	return 0;
>   }
>   
> Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@...e.de                              +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer