linux-kernel - Re: [PATCH v9 11/22] media: uvcvideo: Set unique vdev name based in type

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Message-ID: <YMJBsysskTVelGLO@pendragon.ideasonboard.com>
Date:   Thu, 10 Jun 2021 19:45:39 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        tfiga@...omium.org
Subject: Re: [PATCH v9 11/22] media: uvcvideo: Set unique vdev name based in
 type

Hi Ricardo,

Thank you for the patch.

On Fri, Mar 26, 2021 at 10:58:29AM +0100, Ricardo Ribalda wrote:
> All the entities must have a unique name. We can have a descriptive and
> unique name by appending the function and the entity->id.
> 
> This is even resilent to multi chain devices.
> 
> Fixes v4l2-compliance:
> Media Controller ioctls:
>                 fail: v4l2-test-media.cpp(205): v2_entity_names_set.find(key) != v2_entity_names_set.end()
>         test MEDIA_IOC_G_TOPOLOGY: FAIL
>                 fail: v4l2-test-media.cpp(394): num_data_links != num_links
> 	test MEDIA_IOC_ENUM_ENTITIES/LINKS: FAIL
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> Reviewed-by: Hans Verkuil <hverkuil-cisco@...all.nl>
> ---
>  drivers/media/usb/uvc/uvc_driver.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> index 35873cf2773d..76ab6acecbc9 100644
> --- a/drivers/media/usb/uvc/uvc_driver.c
> +++ b/drivers/media/usb/uvc/uvc_driver.c
> @@ -2163,6 +2163,7 @@ int uvc_register_video_device(struct uvc_device *dev,
>  			      const struct v4l2_ioctl_ops *ioctl_ops)
>  {
>  	int ret;
> +	const char *name;

Please swap the two variables.

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

>  
>  	/* Initialize the video buffers queue. */
>  	ret = uvc_queue_init(queue, type, !uvc_no_drop_param);
> @@ -2190,16 +2191,20 @@ int uvc_register_video_device(struct uvc_device *dev,
>  	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
>  	default:
>  		vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> +		name = "Video Capture";
>  		break;
>  	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
>  		vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
> +		name = "Video Output";
>  		break;
>  	case V4L2_BUF_TYPE_META_CAPTURE:
>  		vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
> +		name = "Metadata";
>  		break;
>  	}
>  
> -	strscpy(vdev->name, dev->name, sizeof(vdev->name));
> +	snprintf(vdev->name, sizeof(vdev->name), "%s %u", name,
> +		 stream->header.bTerminalLink);
>  
>  	/*
>  	 * Set the driver data before calling video_register_device, otherwise

-- 
Regards,

Laurent Pinchart