[media] media: Improve documentation for link_setup/link_modify

Those callbacks are called with the media_device.graph_mutex held.

Add a note about that, as the code called by those notifiers should
not be touching in the mutex.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

2 files changed, 5 insertions, 1 deletions

diff --git a/include/media/media-device.h b/include/media/media-device.h
index b21ef244ad3e..a9b33c47310d 100644
--- a/include/media/media-device.h
+++ b/include/media/media-device.h
@@ -311,7 +311,8 @@ struct media_entity_notify {
  * @enable_source: Enable Source Handler function pointer
  * @disable_source: Disable Source Handler function pointer
  *
- * @link_notify: Link state change notification callback
+ * @link_notify: Link state change notification callback. This callback is
+ *               called with the graph_mutex held.
  *
  * This structure represents an abstract high-level media device. It allows easy
  * access to entities and provides basic media device-level support. The
diff --git a/include/media/media-entity.h b/include/media/media-entity.h
index e0295eefd702..cbb266f7f2b5 100644
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -179,6 +179,9 @@ struct media_pad {
  * @link_validate:      Return whether a link is valid from the entity point of
  *                      view. The media_entity_pipeline_start() function
  *                      validates all links by calling this operation. Optional.
+ *
+ * Note: Those these callbacks are called with struct media_device.@graph_mutex
+ * mutex held.
  */
 struct media_entity_operations {
         int (*link_setup)(struct media_entity *entity,