linux-kernel - Re: [PATCH v6 11/17] media: uvcvideo: Use dev->name for querycap()

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Date:   Thu, 18 Mar 2021 09:05:55 +0100
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Ricardo Ribalda <ribalda@...omium.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        tfiga@...omium.org
Subject: Re: [PATCH v6 11/17] media: uvcvideo: Use dev->name for querycap()

On 17/03/2021 17:45, Ricardo Ribalda wrote:
> Use the device name for the card name instead of vdev->name.
> 
> Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  drivers/media/usb/uvc/uvc_v4l2.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index 397217171bbb..dd10cb9361fa 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -617,13 +617,12 @@ static int uvc_v4l2_release(struct file *file)
>  static int uvc_ioctl_querycap(struct file *file, void *fh,
>  			      struct v4l2_capability *cap)
>  {
> -	struct video_device *vdev = video_devdata(file);
>  	struct uvc_fh *handle = file->private_data;
>  	struct uvc_video_chain *chain = handle->chain;
>  	struct uvc_streaming *stream = handle->stream;
>  
>  	strscpy(cap->driver, "uvcvideo", sizeof(cap->driver));
> -	strscpy(cap->card, vdev->name, sizeof(cap->card));
> +	strscpy(cap->card, handle->stream->dev->name, sizeof(cap->card));
>  	usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
>  	cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
>  			  | chain->caps;
> 

You forgot to update querycap in uvc_metadata.c as well:

Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
---
diff --git a/drivers/media/usb/uvc/uvc_metadata.c b/drivers/media/usb/uvc/uvc_metadata.c
index 849d8e5ab75d..d3aab22f91ce 100644
--- a/drivers/media/usb/uvc/uvc_metadata.c
+++ b/drivers/media/usb/uvc/uvc_metadata.c
@@ -30,7 +30,7 @@ static int uvc_meta_v4l2_querycap(struct file *file, void *fh,
 	struct uvc_video_chain *chain = stream->chain;

 	strscpy(cap->driver, "uvcvideo", sizeof(cap->driver));
-	strscpy(cap->card, vfh->vdev->name, sizeof(cap->card));
+	strscpy(cap->card, stream->dev->name, sizeof(cap->card));
 	usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
 	cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 			  | chain->caps;

With this change both video and metadata card names are the same, as you would
expect.

Regards,

	Hans