Re: [PATCH 6/9] s390/block/dasd_genhd: add error handling support for add_disk()

From: "Jan Höppner" <hoeppner@linux.ibm.com>
To: Luis Chamberlain <mcgrof@kernel.org>
Cc: axboe@kernel.dk, gregkh@linuxfoundation.org,
	chaitanya.kulkarni@wdc.com, atulgopinathan@gmail.com,
	hare@suse.de, maximlevitsky@gmail.com, oakad@yahoo.com,
	ulf.hansson@linaro.org, colin.king@canonical.com,
	shubhankarvk@gmail.com, baijiaju1990@gmail.com, trix@redhat.com,
	dongsheng.yang@easystack.cn, ceph-devel@vger.kernel.org,
	miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com,
	sth@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com,
	borntraeger@de.ibm.com, oberpar@linux.ibm.com, tj@kernel.org,
	linux-s390@vger.kernel.org, linux-mtd@lists.infradead.org,
	linux-mmc@vger.kernel.org, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 6/9] s390/block/dasd_genhd: add error handling support for add_disk()
Date: Wed, 15 Sep 2021 16:57:48 +0200	[thread overview]
Message-ID: <417cf368-6821-442b-0a14-006b27690591@linux.ibm.com> (raw)
In-Reply-To: <YT+Bmvv3yXbuBddi@bombadil.infradead.org>

On 13/09/2021 18:51, Luis Chamberlain wrote:
> 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@kernel.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
> 

I'd be fine with you just taking the changes for your patchset.
Once you've resent the whole patchset I'll review it and send
the usual ack or r-b.

regards,
Jan