linux-kernel - Re: [PATCH] media/v4l2-ctrls: Always run s

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Date:	Tue, 17 Feb 2015 13:21:24 +0100
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Hans Verkuil <hverkuil@...all.nl>
Cc:	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Antti Palosaari <crope@....fi>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	linux-media <linux-media@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media/v4l2-ctrls: Always run s_ctrl on volatile ctrls

Hello Hans

On Tue, Feb 17, 2015 at 1:03 PM, Hans Verkuil <hverkuil@...all.nl> wrote:
> Should be done after the 'ctrl == NULL' check.

Good catch. Fixed on v2

>
>>
>>               if (ctrl == NULL)
>>                       continue;
>>
>
> There is one more change that has to be made: setting a volatile control
> should never generate a V4L2_EVENT_CTRL_CH_VALUE event since that makes
> no sense. The way to prevent that is to ensure that ctrl->has_changed is
> always false for volatile controls. The new_to_cur function looks at that
> field to decide whether to send an event.
>
> The documentation should also be updated: that of V4L2_CTRL_FLAG_VOLATILE
> (in VIDIOC_QUERYCTRL), and of V4L2_EVENT_CTRL_CH_VALUE.

I can do this also if you want. It has been a while without
contributing to media :)

Regards!

>
> Regards,
>
>         Hans



-- 
Ricardo Ribalda
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