Re: [PATCH 08/10] dm: add add_disk() error handling

[Christoph Hellwig <hch@infradead.org>]

On Mon, Aug 23, 2021 at 01:29:28PM -0700, Luis Chamberlain wrote:
> -	add_disk(md->disk);
> +	r = add_disk(md->disk);
> +	if (r)
> +		goto out_cleanup_disk;
>  
>  	r = dm_sysfs_init(md);
> -	if (r) {
> -		del_gendisk(md->disk);
> -		return r;
> -	}
> +	if (r)
> +		goto out_del_gendisk;
>  	md->type = type;
>  	return 0;
> +
> +out_cleanup_disk:
> +	blk_cleanup_disk(md->disk);
> +out_del_gendisk:
> +	del_gendisk(md->disk);
> +	return r;

I think the add_disk should just return r.  If you look at the
callers they eventualy end up in dm_table_destroy, which does
this cleanup.