From 503c3d829eaf48837dd5bff5d97ad66369bb955a Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Sun, 7 Mar 2010 15:04:59 -0300 Subject: [media] media: Entity use count Due to the wide differences between drivers regarding power management needs, the media controller does not implement power management. However, the media_entity structure includes a use_count field that media drivers can use to track the number of users of every entity for power management needs. The use_count field is owned by media drivers and must not be touched by entity drivers. Access to the field must be protected by the media device graph_mutex lock. Signed-off-by: Laurent Pinchart Acked-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- include/media/media-entity.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'include/media/media-entity.h') diff --git a/include/media/media-entity.h b/include/media/media-entity.h index 28f61f6ee549..a9b31d98e3c6 100644 --- a/include/media/media-entity.h +++ b/include/media/media-entity.h @@ -81,6 +81,12 @@ struct media_entity { struct media_pad *pads; /* Pads array (num_pads elements) */ struct media_link *links; /* Links array (max_links elements)*/ + /* Reference counts must never be negative, but are signed integers on + * purpose: a simple WARN_ON(<0) check can be used to detect reference + * count bugs that would make them negative. + */ + int use_count; /* Use count for the entity. */ + union { /* Node specifications */ struct { @@ -129,6 +135,9 @@ void media_entity_cleanup(struct media_entity *entity); int media_entity_create_link(struct media_entity *source, u16 source_pad, struct media_entity *sink, u16 sink_pad, u32 flags); +struct media_entity *media_entity_get(struct media_entity *entity); +void media_entity_put(struct media_entity *entity); + void media_entity_graph_walk_start(struct media_entity_graph *graph, struct media_entity *entity); struct media_entity * -- cgit v1.2.3