media: videodev2.h: Fix shifting signed 32-bit value by 31 bits problem

Fix v4l2_fourcc define to use "U" cast to avoid shifting signed 32-bit
value by 31 bits problem. This isn't a problem for kernel builds with
gcc.

This could be problem since this header is part of public API which
could be included for builds using compilers that don't handle this
condition safely resulting in undefined behavior.

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 1050a75fb7ef67c374aea2a8ea25c978e9c568a4..9d9705ceda768b3e107ecb92a5837204d3d9c4a1 100644 (file)
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -80,7 +80,7 @@
 /*  Four-character-code (FOURCC) */
 #define v4l2_fourcc(a, b, c, d)\
        ((__u32)(a) | ((__u32)(b) << 8) | ((__u32)(c) << 16) | ((__u32)(d) << 24))
-#define v4l2_fourcc_be(a, b, c, d)     (v4l2_fourcc(a, b, c, d) | (1 << 31))
+#define v4l2_fourcc_be(a, b, c, d)     (v4l2_fourcc(a, b, c, d) | (1U << 31))
 
 /*
  *     E N U M S