linux-kernel - Re: [PATCH] media: uapi: v4l: Change V4L2_TYPE_IS

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Date: Wed, 22 May 2024 09:54:34 +0200
From: Michael Tretter <m.tretter@...gutronix.de>
To: Nas Chung <nas.chung@...psnmedia.com>
Cc: mchehab@...nel.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Sebastian Fricke <sebastian.fricke@...labora.com>
Subject: Re: [PATCH] media: uapi: v4l: Change V4L2_TYPE_IS_CAPTURE condition

On Fri, 17 May 2024 18:49:40 +0900, Nas Chung wrote:
> We expect V4L2_TYPE_IS_CAPTURE() macro allow only CAPTURE type.
> But, Inverting OUTPUT type can allow undefined v4l2_buf_type.
> Check CAPTURE type directly instead of inverting OUTPUT type.
> 
> Signed-off-by: Nas Chung <nas.chung@...psnmedia.com>
> ---
>  include/uapi/linux/videodev2.h | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index fe6b67e83751..32b10e2b7695 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -171,7 +171,13 @@ enum v4l2_buf_type {
>  	 || (type) == V4L2_BUF_TYPE_SDR_OUTPUT			\
>  	 || (type) == V4L2_BUF_TYPE_META_OUTPUT)
>  
> -#define V4L2_TYPE_IS_CAPTURE(type) (!V4L2_TYPE_IS_OUTPUT(type))
> +#define V4L2_TYPE_IS_CAPTURE(type)				\
> +	((type) == V4L2_BUF_TYPE_VIDEO_CAPTURE			\
> +	 || (type) == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE	\
> +	 || (type) == V4L2_BUF_TYPE_VBI_CAPTURE			\
> +	 || (type) == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE		\
> +	 || (type) == V4L2_BUF_TYPE_SDR_CAPTURE			\
> +	 || (type) == V4L2_BUF_TYPE_META_CAPTURE)

Maybe adding a V4L2_TYPE_IS_VALID(type) macro would be helpful to define
TYPE_IS_CAPTURE as all valid types that are not OUTPUT:

	#define V4L2_TYPE_IS_VALID(type) \
		((type) >= V4L2_BUF_TYPE_VIDEO_CAPTURE \
		&& (type) <= V4L2_BUF_TYPE_META_OUTPUT)

	#define V4L2_TYPE_IS_CAPTURE(type) \
		(V4L2_TYPE_IS_VALID(type) && !V4L2_TYPE_IS_OUTPUT(type))

This would avoid keeping the two explicit lists of OUTPUT and CAPTURE
types.

Michael

>  
>  enum v4l2_tuner_type {
>  	V4L2_TUNER_RADIO	     = 1,
> -- 
> 2.25.1
> 
> 
>