linux-kernel - Re: [PATCH 1/3] Revert "media: uvcvideo: Set unique vdev name based in type"

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Date:   Tue, 7 Dec 2021 02:18:11 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Ricardo Ribalda <ricardo.ribalda@...il.com>,
        Nicolas Dufresne <nicolas@...fresne.ca>,
        Ricardo Ribalda <ribalda@...omium.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, stable <stable@...r.kernel.org>
Subject: Re: [PATCH 1/3] Revert "media: uvcvideo: Set unique vdev name based
 in type"

On Tue, Dec 07, 2021 at 02:14:01AM +0200, Laurent Pinchart wrote:
> Hi Ricardo,
> 
> Thank you for the patch.
> 
> On Tue, Dec 07, 2021 at 01:06:27AM +0100, Ricardo Ribalda wrote:
> > A lot of userspace depends on a descriptive name for vdev. Without this
> > patch, users have a hard time figuring out which camera shall they use
> > for their video conferencing.
> > 
> > This reverts commit e3f60e7e1a2b451f538f9926763432249bcf39c4.
> > 
> > Cc: <stable@...r.kernel.org>
> > Fixes: e3f60e7e1a2b ("media: uvcvideo: Set unique vdev name based in type")
> > Reported-by: Nicolas Dufresne <nicolas@...fresne.ca>
> > Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Mauro, is it possible to queue this as a fix for v5.16 ?

> > ---
> >  drivers/media/usb/uvc/uvc_driver.c | 7 +------
> >  1 file changed, 1 insertion(+), 6 deletions(-)
> > 
> > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> > index 7c007426e082..058d28a0344b 100644
> > --- a/drivers/media/usb/uvc/uvc_driver.c
> > +++ b/drivers/media/usb/uvc/uvc_driver.c
> > @@ -2193,7 +2193,6 @@ int uvc_register_video_device(struct uvc_device *dev,
> >  			      const struct v4l2_file_operations *fops,
> >  			      const struct v4l2_ioctl_ops *ioctl_ops)
> >  {
> > -	const char *name;
> >  	int ret;
> >  
> >  	/* Initialize the video buffers queue. */
> > @@ -2222,20 +2221,16 @@ 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;
> >  	}
> >  
> > -	snprintf(vdev->name, sizeof(vdev->name), "%s %u", name,
> > -		 stream->header.bTerminalLink);
> > +	strscpy(vdev->name, dev->name, sizeof(vdev->name));
> >  
> >  	/*
> >  	 * Set the driver data before calling video_register_device, otherwise

-- 
Regards,

Laurent Pinchart