linux-kernel - Re: [PATCH 2/3] media: v4l2-dev.c: Allow driver-defined entity names

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Message-ID: <Ya6nmXKvTqhMVToH@pendragon.ideasonboard.com>
Date:   Tue, 7 Dec 2021 02:15:21 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Ricardo Ribalda <ricardo.ribalda@...il.com>
Cc:     Nicolas Dufresne <nicolas@...fresne.ca>,
        ": Ricardo Ribalda" <ribalda@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        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, stable <stable@...r.kernel.org>
Subject: Re: [PATCH 2/3] media: v4l2-dev.c: Allow driver-defined entity names

Hi Ricardo,

Thank you for the patch.

On Tue, Dec 07, 2021 at 01:06:28AM +0100, Ricardo Ribalda wrote:
> If the driver provides an name for an entity, use it.
> This is particularly useful for drivers that export multiple video
> devices for the same hardware (i.e. metadata and data).

This seems reasonable (especially given that I've proposed it), but I
may be missing unintented consequences. Other reviews would be useful.

> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  drivers/media/v4l2-core/v4l2-dev.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
> index d03ace324db0..4c00503b9349 100644
> --- a/drivers/media/v4l2-core/v4l2-dev.c
> +++ b/drivers/media/v4l2-core/v4l2-dev.c
> @@ -832,7 +832,9 @@ static int video_register_media_controller(struct video_device *vdev)
>  	}
>  
>  	if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) {
> -		vdev->entity.name = vdev->name;
> +		/* Use entity names provided by the driver, if available. */
> +		if (!vdev->entity.name)
> +			vdev->entity.name = vdev->name;

We need to document this.

>  
>  		/* Needed just for backward compatibility with legacy MC API */
>  		vdev->entity.info.dev.major = VIDEO_MAJOR;

-- 
Regards,

Laurent Pinchart