media: v4l2-dev.c: Modified the macro SET_VALID_IOCTL

Macros starting with if should be enclosed by a do - while loop
to avoid possible if/else logic defects.
So modified the macro SET_VALID_IOCTL with do - while loop.

[hverkuil: checkpatch: add parenthesis around 'ops']

Signed-off-by: lijian <lijian@yulong.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index 4aa8fcd..d03ace3 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -518,9 +518,8 @@ static int get_index(struct video_device *vdev)
        return find_first_zero_bit(used, VIDEO_NUM_DEVICES);
 }
 
-#define SET_VALID_IOCTL(ops, cmd, op)                  \
-       if (ops->op)                                    \
-               set_bit(_IOC_NR(cmd), valid_ioctls)
+#define SET_VALID_IOCTL(ops, cmd, op) \
+       do { if ((ops)->op) set_bit(_IOC_NR(cmd), valid_ioctls); } while (0)
 
 /* This determines which ioctls are actually implemented in the driver.
    It's a one-time thing which simplifies video_ioctl2 as it can just do