linux-kernel - Re: [PATCH 4/5] video:omap3isp:fix up ENOIOCTLCMD error handling

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Date:	Thu, 13 Sep 2012 18:21:18 +0800
From:	Wanlong Gao <gaowanlong@...fujitsu.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 4/5] video:omap3isp:fix up ENOIOCTLCMD error handling

On 09/13/2012 12:03 PM, Laurent Pinchart wrote:
> Hi Wanlong,
> 
> Thanks for the patch.
> 
> On Monday 27 August 2012 15:23:15 Wanlong Gao wrote:
>> At commit 07d106d0, Linus pointed out that ENOIOCTLCMD should be
>> translated as ENOTTY to user mode.
>>
>> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>> Cc: Mauro Carvalho Chehab <mchehab@...radead.org>
>> Cc: linux-media@...r.kernel.org
>> Signed-off-by: Wanlong Gao <gaowanlong@...fujitsu.com>
>> ---
>>  drivers/media/video/omap3isp/ispvideo.c | 10 +++++-----
>>  1 file changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/media/video/omap3isp/ispvideo.c
>> b/drivers/media/video/omap3isp/ispvideo.c index b37379d..2dd982e 100644
>> --- a/drivers/media/video/omap3isp/ispvideo.c
>> +++ b/drivers/media/video/omap3isp/ispvideo.c
>> @@ -337,7 +337,7 @@ __isp_video_get_format(struct isp_video *video, struct
>> v4l2_format *format) fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
>>  	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
>>  	if (ret == -ENOIOCTLCMD)
>> -		ret = -EINVAL;
>> +		ret = -ENOTTY;
> 
> I don't think this location should be changed. __isp_video_get_format() is 
> called by isp_video_check_format() only, which in turn is called by 
> isp_video_streamon() only. A failure to retrieve the format in 
> __isp_video_get_format() does not really mean the VIDIOC_STREAMON is not 
> supported.
> 
> I'll apply hunks 2 to 5 and drop hunk 1 if that's fine with you.

Fine, I defer to your great knowledge in this.

Thanks,
Wanlong Gao

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