linux-kernel - Re: [PATCH v2 01/12] media: uvcvideo: Always set default

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Message-ID: <20250629173958.GA6260@pendragon.ideasonboard.com>
Date: Sun, 29 Jun 2025 20:39:58 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Hans de Goede <hdegoede@...hat.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Hans Verkuil <hverkuil@...all.nl>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 01/12] media: uvcvideo: Always set default_value

Hi Ricardo,

Thank you for the patch.

On Thu, Jun 05, 2025 at 05:52:54PM +0000, Ricardo Ribalda wrote:
> If the control does not support GET_DEF, the field default_value will be
> left uninitialized during queryctrl.
> 
> Fixes: c0efd232929c ("V4L/DVB (8145a): USB Video Class driver")

Media CI rules require a Cc: stable.

> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  drivers/media/usb/uvc/uvc_ctrl.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> index 44b6513c526421943bb9841fb53dc5f8e9f93f02..47e8ccc39234d1769384b55539a21df07f3d57c7 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -1497,6 +1497,8 @@ static int __uvc_queryctrl_boundaries(struct uvc_video_chain *chain,
>  	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_DEF) {
>  		v4l2_ctrl->default_value = uvc_mapping_get_s32(mapping,
>  				UVC_GET_DEF, uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF));
> +	} else {
> +		v4l2_ctrl->default_value = 0;
>  	}

While at it we can drop the curly braces.

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

>  
>  	switch (mapping->v4l2_type) {

-- 
Regards,

Laurent Pinchart