linux-kernel - Re: [PATCH 4/4] media: uvcvideo: Populate all errors in uvc

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Message-ID: <20250523115759.GE12514@pendragon.ideasonboard.com>
Date: Fri, 23 May 2025 13:57:59 +0200
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>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] media: uvcvideo: Populate all errors in uvc_probe()

Hi Ricardo,

On Fri, May 09, 2025 at 06:24:16PM +0000, Ricardo Ribalda wrote:
> Now we are replacing most of the error codes with -ENODEV.
> Instead, Populate the error code from the functions called by
> uvc_probe().
> 
> Take this opportunity to replace a generic error code from
> uvc_scan_device() into something more meaningful.
> 
> Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  drivers/media/usb/uvc/uvc_driver.c | 15 ++++-----------
>  1 file changed, 4 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> index da24a655ab68cc0957762f2b67387677c22224d1..cdf4bbe582272277a6a95267e9752010adc51b6b 100644
> --- a/drivers/media/usb/uvc/uvc_driver.c
> +++ b/drivers/media/usb/uvc/uvc_driver.c
> @@ -1866,7 +1866,7 @@ static int uvc_scan_device(struct uvc_device *dev)
>  
>  	if (list_empty(&dev->chains)) {
>  		dev_info(&dev->udev->dev, "No valid video chain found.\n");
> -		return -1;
> +		return -ENODEV;
>  	}
>  
>  	/* Add GPIO entity to the first chain. */
> @@ -2239,7 +2239,6 @@ static int uvc_probe(struct usb_interface *intf,
>  	/* Parse the Video Class control descriptor. */
>  	ret = uvc_parse_control(dev);
>  	if (ret < 0) {
> -		ret = -ENODEV;
>  		uvc_dbg(dev, PROBE, "Unable to parse UVC descriptors\n");
>  		goto error;
>  	}
> @@ -2275,22 +2274,16 @@ static int uvc_probe(struct usb_interface *intf,
>  		goto error;
>  
>  	/* Scan the device for video chains. */
> -	if (uvc_scan_device(dev) < 0) {
> -		ret = -ENODEV;
> +	if (uvc_scan_device(dev) < 0)

That's not going to work. You probably meant

	ret = uvc_scan_device(dev);
	if (ret < 0)

Same elsewhere where applicable.

>  		goto error;
> -	}
>  
>  	/* Initialize controls. */
> -	if (uvc_ctrl_init_device(dev) < 0) {
> -		ret = -ENODEV;
> +	if (uvc_ctrl_init_device(dev) < 0)
>  		goto error;
> -	}
>  
>  	/* Register video device nodes. */
> -	if (uvc_register_chains(dev) < 0) {
> -		ret = -ENODEV;
> +	if (uvc_register_chains(dev) < 0)
>  		goto error;
> -	}
>  
>  #ifdef CONFIG_MEDIA_CONTROLLER
>  	/* Register the media device node */

-- 
Regards,

Laurent Pinchart