linux-kernel - Re: [PATCH 9/9] s390/block/xpram: add error handling support for add

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Date:   Fri, 3 Sep 2021 16:06:15 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     axboe@...nel.dk, gregkh@...uxfoundation.org,
        chaitanya.kulkarni@....com, atulgopinathan@...il.com, hare@...e.de,
        maximlevitsky@...il.com, oakad@...oo.com, ulf.hansson@...aro.org,
        colin.king@...onical.com, shubhankarvk@...il.com,
        baijiaju1990@...il.com, trix@...hat.com,
        dongsheng.yang@...ystack.cn, ceph-devel@...r.kernel.org,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        sth@...ux.ibm.com, hoeppner@...ux.ibm.com, gor@...ux.ibm.com,
        borntraeger@...ibm.com, oberpar@...ux.ibm.com, tj@...nel.org,
        linux-s390@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-mmc@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/9] s390/block/xpram: add error handling support for
 add_disk()

On Thu, Sep 02, 2021 at 10:41:05AM -0700, 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/s390/block/xpram.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/s390/block/xpram.c b/drivers/s390/block/xpram.c
> index ce98fab4d43c..ed3904b6a9c8 100644
> --- a/drivers/s390/block/xpram.c
> +++ b/drivers/s390/block/xpram.c
> @@ -371,7 +371,9 @@ static int __init xpram_setup_blkdev(void)
>  		disk->private_data = &xpram_devices[i];
>  		sprintf(disk->disk_name, "slram%d", i);
>  		set_capacity(disk, xpram_sizes[i] << 1);
> -		add_disk(disk);
> +		rc = add_disk(disk);
> +		if (rc)
> +			goto out;

Hmm, this is a more or less dead device driver, and I'm wondering if
we shouldn't remove it instead. But anyway, your patch is not correct:

- del_gendisk for all registered disks has to be called
- unregister_blkdev(XPRAM_MAJOR, XPRAM_NAME) is missing as well

That would be more or or less xpram_exit with parameter.

You can send a new patch or I can provide a proper one, whatever you
prefer.