linux-kernel - Re: [PATCH] mtd: blktrans: change blktrans

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Date:	Thu, 21 May 2015 09:56:21 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	Wenlin Kang <wenlin.kang@...driver.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	David Woodhouse <dwmw2@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: blktrans: change blktrans_getgeo rerurn value

On Wed, May 20, 2015 at 9:33 PM, Brian Norris
<computersforpeace@...il.com> wrote:
> Hi Wenlin,
>
> In the subject:
>
> s/rerurn/return/
>
> On Wed, May 13, 2015 at 02:29:16PM +0800, Wenlin Kang wrote:
>> Modify function blktrans_getgeo()'s return value to -ENXIO when
>> dev->tr->getgeo == NULL.
>>
>> We shouldn't make the return value to 0 when dev->tr->getgeo == NULL,
>> because the function blktrans_getgeo() has an output value "hd_geometry"
>> which is usually used by some application, if return 0, it will make some
>> application get the wrong information.
>>
>> Signed-off-by: Wenlin Kang <wenlin.kang@...driver.com>
>> ---
>>  drivers/mtd/mtd_blkdevs.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
>> index 2b0c5287..f8bb16e 100644
>> --- a/drivers/mtd/mtd_blkdevs.c
>> +++ b/drivers/mtd/mtd_blkdevs.c
>> @@ -273,7 +273,7 @@ static int blktrans_getgeo(struct block_device *bdev, struct hd_geometry *geo)
>>       if (!dev->mtd)
>>               goto unlock;
>>
>> -     ret = dev->tr->getgeo ? dev->tr->getgeo(dev, geo) : 0;
>> +     ret = dev->tr->getgeo ? dev->tr->getgeo(dev, geo) : -ENXIO;
>
> Good catch. I don't think ENXIO is correct in this case, though. Maybe
> -EOPNOTSUPP or -ENOSYS? The latter might make more sense I guess.

I'd vote for -ENOTTY as this is what HDIO_GETGEIO returns
if the function is not implemented and blktrans_getgeo()
is only a wrapper around that.

See https://www.kernel.org/doc/Documentation/ioctl/hdio.txt
and block/ioctl.c.

-- 
Thanks,
//richard
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