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

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Date:	Thu, 21 May 2015 00:37:41 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Wenlin Kang <wenlin.kang@...driver.com>
Cc:	linux-mtd@...ts.infradead.org, dwmw2@...radead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: blktrans: change blktrans_getgeo rerurn value

On Thu, May 21, 2015 at 02:49:38PM +0800, Wenlin Kang wrote:
> On 2015年05月21日 03:47, nick wrote:
> >On 2015-05-20 03:33 PM, Brian Norris wrote:
> >>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 would recommend -EOPNOTSUPP as this as nothing to do with unimplemented
> >functions or hardware support. This is just unsupported due to the value
> >being NULL and therefore the hardware support is not there.
> >Just My Option,
> >Nick
> 
> As you said, -EOPNOTSUPP might be better,thanks.

Nick's opinion is irrelevant here:

https://lkml.org/lkml/2014/8/4/206

> I have remade the patch and attached it, would you please check it
> again? thanks.

Please send patches inline (e.g., via git-send-email), not as
attachments. But this is pretty trivial, and it's what I already tested.

So, applied to l2-mtd.git.

Brian
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