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[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>
This commit is contained in:
Mauro Carvalho Chehab 2016-04-06 10:55:25 -03:00
parent e2c91d4d78
commit 5ed470feb9
2 changed files with 5 additions and 1 deletions
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3
include/media/media-device.h
View File

@ -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

3
include/media/media-entity.h
View File

@ -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,