linux-kernel - Re: [PATCH 6/9] media: uvcvideo: Do not enable camera during UVCIOC_CTRL

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Message-ID: <8a77f74b-12aa-4aac-a3d3-4ec8be8d2cf3@kernel.org>
Date: Mon, 2 Jun 2025 11:46:02 +0200
From: Hans de Goede <hansg@...nel.org>
To: Ricardo Ribalda <ribalda@...omium.org>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Hans de Goede <hdegoede@...hat.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Hans Verkuil <hverkuil@...all.nl>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/9] media: uvcvideo: Do not enable camera during
 UVCIOC_CTRL_MAP32

Hi Ricardo,

On 28-May-25 19:58, Ricardo Ribalda wrote:
> The device does not need to be enabled to do this, it is merely an
> internal data operation.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  drivers/media/usb/uvc/uvc_v4l2.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index 65c708b3fb1066bf2e8f12ab7cdf119452ad40f9..2c6f3cf6bcc3f116bbdb3383d9af7d5be9832537 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -1224,10 +1224,6 @@ static long uvc_v4l2_compat_ioctl32(struct file *file,
>  	void __user *up = compat_ptr(arg);
>  	long ret;
>  
> -	ret = uvc_pm_get(handle->stream->dev);
> -	if (ret)
> -		return ret;
> -
>  	switch (cmd) {
>  	case UVCIOC_CTRL_MAP32:
>  		ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
> @@ -1245,7 +1241,13 @@ static long uvc_v4l2_compat_ioctl32(struct file *file,
>  		ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
>  		if (ret)
>  			break;
> +
> +		ret = uvc_pm_get(handle->stream->dev);
> +		if (ret)
> +			return ret;

The rest of the code here uses:

		if (ret)
			break;

as pattern, please also use that for the uvc_pm_get() error handling

Otherwise this looks good to me:

Reviewed-by: Hans de Goede <hansg@...nel.org>

Regards,

Hans




>  		ret = uvc_xu_ctrl_query(handle->chain, &karg.xqry);
> +		uvc_pm_put(handle->stream->dev);
> +
>  		if (ret)
>  			break;
>  		ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
> @@ -1258,8 +1260,6 @@ static long uvc_v4l2_compat_ioctl32(struct file *file,
>  		break;
>  	}
>  
> -	uvc_pm_put(handle->stream->dev);
> -
>  	return ret;
>  }
>  #endif
>