linux-kernel - Re: [PATCH 6/9] s390/block/dasd_genhd: add error handling support for add

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Message-ID: <YT+Bmvv3yXbuBddi@bombadil.infradead.org>
Date:   Mon, 13 Sep 2021 09:51:38 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Jan Höppner <hoeppner@...ux.ibm.com>
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, hca@...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 6/9] s390/block/dasd_genhd: add error handling support
 for add_disk()

On Mon, Sep 13, 2021 at 02:19:38PM +0200, Jan Höppner wrote:
> On 13/09/2021 10:17, Jan Höppner wrote:
> > On 02/09/2021 19:41, 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/dasd_genhd.c | 8 ++++++--
> >>  1 file changed, 6 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c
> >> index fa966e0db6ca..ba07022283bc 100644
> >> --- a/drivers/s390/block/dasd_genhd.c
> >> +++ b/drivers/s390/block/dasd_genhd.c
> >> @@ -33,7 +33,7 @@ int dasd_gendisk_alloc(struct dasd_block *block)
> >>  {
> >>  	struct gendisk *gdp;
> >>  	struct dasd_device *base;
> >> -	int len;
> >> +	int len, rc;
> >>  
> >>  	/* Make sure the minor for this device exists. */
> >>  	base = block->base;
> >> @@ -79,7 +79,11 @@ int dasd_gendisk_alloc(struct dasd_block *block)
> >>  	dasd_add_link_to_gendisk(gdp, base);
> >>  	block->gdp = gdp;
> >>  	set_capacity(block->gdp, 0);
> >> -	device_add_disk(&base->cdev->dev, block->gdp, NULL);
> >> +
> >> +	rc = device_add_disk(&base->cdev->dev, block->gdp, NULL);
> >> +	if (rc)
> >> +		return rc;
> >> +
> > 
> > I think, just like with some of the other changes, there is some
> > cleanup required before returning. I'll prepare a patch and
> > come back to you.
> > 
> 
> It's actually just one call that is required. The patch should
> look like this:
> 
> diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c
> index fa966e0db6ca..80673dbfb1f9 100644
> --- a/drivers/s390/block/dasd_genhd.c
> +++ b/drivers/s390/block/dasd_genhd.c
> @@ -33,7 +33,7 @@ int dasd_gendisk_alloc(struct dasd_block *block)
>  {
>         struct gendisk *gdp;
>         struct dasd_device *base;
> -       int len;
> +       int len, rc;
>  
>         /* Make sure the minor for this device exists. */
>         base = block->base;
> @@ -79,7 +79,13 @@ int dasd_gendisk_alloc(struct dasd_block *block)
>         dasd_add_link_to_gendisk(gdp, base);
>         block->gdp = gdp;
>         set_capacity(block->gdp, 0);
> -       device_add_disk(&base->cdev->dev, block->gdp, NULL);
> +
> +       rc = device_add_disk(&base->cdev->dev, block->gdp, NULL);
> +       if (rc) {
> +               dasd_gendisk_free(block);
> +               return rc;
> +       }
> +

Thanks!

Would you like to to fold this fix into my patch and resend eventually?
Or will you send a replacement?

  Luis