The sd argument of this macro can be a more complex expression. Since it
is used 5 times in the macro it can be evaluated that many times as well.
So assign it to a temp variable in the beginning and use that instead.
This also avoids any potential side-effects of evaluating sd.
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
---
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 47af609dc8f1..34da094a3f40 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1093,13 +1093,14 @@ void v4l2_subdev_init(struct v4l2_subdev *sd,
*/
#define v4l2_subdev_call(sd, o, f, args...) \
({ \
+ struct v4l2_subdev *__sd = (sd); \
int __result; \
- if (!(sd)) \
+ if (!__sd) \
__result = -ENODEV; \
- else if (!((sd)->ops->o && (sd)->ops->o->f)) \
+ else if (!(__sd->ops->o && __sd->ops->o->f)) \
__result = -ENOIOCTLCMD; \
else \
- __result = (sd)->ops->o->f((sd), ##args); \
+ __result = __sd->ops->o->f(__sd, ##args); \
__result; \
})
