linux-kernel - Re: [PATCH v8 04/19] media: v4l2-ioctl: S

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Date:   Sat, 20 Mar 2021 08:24:39 +0100
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Ricardo Ribalda <ribalda@...omium.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        tfiga@...omium.org
Subject: Re: [PATCH v8 04/19] media: v4l2-ioctl: S_CTRL output the right value

On 19/03/2021 18:08, Ricardo Ribalda wrote:
> If the driver does not implement s_ctrl, but it does implement
> s_ext_ctrls, we convert the call.
> 
> When that happens we have also to convert back the response from
> s_ext_ctrls.
> 
> Fixes v4l2_compliance:
> Control ioctls (Input 0):
> 		fail: v4l2-test-controls.cpp(411): returned control value out of range
> 		fail: v4l2-test-controls.cpp(507): invalid control 00980900
> 	test VIDIOC_G/S_CTRL: FAIL
> 
> Fixes: 35ea11ff8471 ("V4L/DVB (8430): videodev: move some functions from v4l2-dev.h to v4l2-common.h or v4l2-ioctl.h")
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>

Reviewed-by: Hans Verkuil <hverkuil-cisco@...all.nl>

Regards,

	Hans

> ---
>  drivers/media/v4l2-core/v4l2-ioctl.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 7b5ebdd329e8..b8f73a48872b 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -2266,6 +2266,7 @@ static int v4l_s_ctrl(const struct v4l2_ioctl_ops *ops,
>  		test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
>  	struct v4l2_ext_controls ctrls;
>  	struct v4l2_ext_control ctrl;
> +	int ret;
>  
>  	if (vfh && vfh->ctrl_handler)
>  		return v4l2_s_ctrl(vfh, vfh->ctrl_handler, p);
> @@ -2281,9 +2282,11 @@ static int v4l_s_ctrl(const struct v4l2_ioctl_ops *ops,
>  	ctrls.controls = &ctrl;
>  	ctrl.id = p->id;
>  	ctrl.value = p->value;
> -	if (check_ext_ctrls(&ctrls, VIDIOC_S_CTRL))
> -		return ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
> -	return -EINVAL;
> +	if (!check_ext_ctrls(&ctrls, VIDIOC_S_CTRL))
> +		return -EINVAL;
> +	ret = ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
> +	p->value = ctrl.value;
> +	return ret;
>  }
>  
>  static int v4l_g_ext_ctrls(const struct v4l2_ioctl_ops *ops,
>