linux-kernel - [PATCH v3 1/3] media: uapi: v4l: Change V4L2_TYPE_IS

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Date: Tue,  4 Jun 2024 14:11:18 +0900
From: Nas Chung <nas.chung@...psnmedia.com>
To: mchehab@...nel.org,
	hverkuil@...all.nl,
	bryan.odonoghue@...aro.org,
	linux-media@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Nas Chung <nas.chung@...psnmedia.com>,
	Michael Tretter <m.tretter@...gutronix.de>
Subject: [PATCH v3 1/3] media: uapi: v4l: Change V4L2_TYPE_IS_CAPTURE condition

Explicitly compare a buffer type only with valid buffer types,
to avoid matching a buffer type outside of the valid buffer type set.

Signed-off-by: Nas Chung <nas.chung@...psnmedia.com>
Reviewed-by: Michael Tretter <m.tretter@...gutronix.de>
---
v3
- Address Han's feedback

v2
- Improve commit message
- Add V4L2_TYPE_IS_VALID(type) macro

 include/uapi/linux/videodev2.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index fe6b67e83751..51da63173a98 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -153,10 +153,17 @@ enum v4l2_buf_type {
 	V4L2_BUF_TYPE_SDR_OUTPUT           = 12,
 	V4L2_BUF_TYPE_META_CAPTURE         = 13,
 	V4L2_BUF_TYPE_META_OUTPUT	   = 14,
+	/*  V4L2_TYPE_IS_VALID and V4L2_TYPE_IS_OUTPUT must
+	 *  be updated if a new type is added.
+	 */
 	/* Deprecated, do not use */
 	V4L2_BUF_TYPE_PRIVATE              = 0x80,
 };
 
+#define V4L2_TYPE_IS_VALID(type)		\
+	((type) >= V4L2_BUF_TYPE_VIDEO_CAPTURE	\
+	 && (type) <= V4L2_BUF_TYPE_META_OUTPUT)
+
 #define V4L2_TYPE_IS_MULTIPLANAR(type)			\
 	((type) == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE	\
 	 || (type) == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
@@ -171,7 +178,8 @@ 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)	\
+	(V4L2_TYPE_IS_VALID(type) && !V4L2_TYPE_IS_OUTPUT(type))
 
 enum v4l2_tuner_type {
 	V4L2_TUNER_RADIO	     = 1,
-- 
2.25.1