On 04/06/2016 03:55 PM, Mauro Carvalho Chehab wrote:
> Those callbacks are called with the media_device.graph_mutex hold.
>
> Add a note about that, as the code called by those notifiers should
> not be touching in the mutex.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
> Acked-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Acked-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Regards,
Hans
> ---
> include/media/media-device.h | 3 ++-
> include/media/media-entity.h | 3 +++
> 2 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/include/media/media-device.h b/include/media/media-device.h
> index b21ef244ad3e..44563ec17d45 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 hold.
> *
> * 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 6dc9e4e8cbd4..0b16ebe36db7 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 ioctls should not touch the struct media_device.@graph_mutex
> + * field, as they're called with it already hold.
> */
> struct media_entity_operations {
> int (*link_setup)(struct media_entity *entity,
>
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