[PATCH v3 1/8] media: v4l: subdev: Store the sub-device in the sub-device state

[Sakari Ailus <sakari.ailus@linux.intel.com>]

Store the sub-device in the sub-device state. This will be needed in e.g.
validating pad number when retrieving information for non-stream-aware
users. There are expected to be more needs for this in the future.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 2 ++
 include/media/v4l2-subdev.h           | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index d295a4e87b66..ee4fe8f33a41 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1441,6 +1441,8 @@ __v4l2_subdev_state_alloc(struct v4l2_subdev *sd, const char *lock_name,
 	else
 		state->lock = &state->_lock;
 
+	state->sd = sd;
+
 	/* Drivers that support streams do not need the legacy pad config */
 	if (!(sd->flags & V4L2_SUBDEV_FL_STREAMS) && sd->entity.num_pads) {
 		state->pads = kvcalloc(sd->entity.num_pads,
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index c1f90c1223a7..6a02a565035c 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -756,6 +756,7 @@ struct v4l2_subdev_krouting {
  *
  * @_lock: default for 'lock'
  * @lock: mutex for the state. May be replaced by the user.
+ * @sd: the sub-device which the state is related to
  * @pads: &struct v4l2_subdev_pad_config array
  * @routing: routing table for the subdev
  * @stream_configs: stream configurations (only for V4L2_SUBDEV_FL_STREAMS)
@@ -768,6 +769,7 @@ struct v4l2_subdev_state {
 	/* lock for the struct v4l2_subdev_state fields */
 	struct mutex _lock;
 	struct mutex *lock;
+	struct v4l2_subdev *sd;
 	struct v4l2_subdev_pad_config *pads;
 	struct v4l2_subdev_krouting routing;
 	struct v4l2_subdev_stream_configs stream_configs;
-- 
2.39.2