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[media] v4l: subdev: tolerate null in media_entity_to_v4l2_subdev

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Return NULL, if a null entity is parsed for it's v4l2_subdev

Currently, the callers of media_entity_to_v4l2_subdev() need to
make sure that the subdev is non-NULL, for example, when it is
obtained from media_entity_remote_pad().

As this is a recurring pattern, add the check at the macro in order
to avoid additional checks at the callers.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Kieran Bingham 2017-06-07 06:52:07 -03:00 committed by Mauro Carvalho Chehab
parent 7eb2bcb2ef
commit 47f910f0e0
1 changed files with 9 additions and 2 deletions
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11
include/media/v4l2-subdev.h
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@ -826,8 +826,15 @@ struct v4l2_subdev {
struct v4l2_subdev_platform_data *pdata;
};
#define media_entity_to_v4l2_subdev(ent) \
container_of(ent, struct v4l2_subdev, entity)
#define media_entity_to_v4l2_subdev(ent) \
({ \
typeof(ent) __me_sd_ent = (ent); \
\
__me_sd_ent ? \
container_of(__me_sd_ent, struct v4l2_subdev, entity) : \
NULL; \
})
#define vdev_to_v4l2_subdev(vdev) \
((struct v4l2_subdev *)video_get_drvdata(vdev))