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

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Date:	Wed, 20 May 2015 12:33:25 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Wenlin Kang <wenlin.kang@...driver.com>
Cc:	dwmw2@...radead.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: blktrans: change blktrans_getgeo rerurn value

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.

>  unlock:
>  	mutex_unlock(&dev->lock);
>  	blktrans_dev_put(dev);

Thanks,
Brian
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