diff options
Diffstat (limited to 'drivers/media/v4l2-core')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-mc.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/media/v4l2-core/v4l2-mc.c b/drivers/media/v4l2-core/v4l2-mc.c index 014a2a97cadd..0fffdd3ce6a4 100644 --- a/drivers/media/v4l2-core/v4l2-mc.c +++ b/drivers/media/v4l2-core/v4l2-mc.c @@ -321,7 +321,7 @@ EXPORT_SYMBOL_GPL(v4l_vb2q_enable_media_source); * use_count field stores the total number of users of all video device nodes * in the pipeline. * - * The v4l2_pipeline_pm_use() function must be called in the open() and + * The v4l2_pipeline_pm_{get, put}() functions must be called in the open() and * close() handlers of video device nodes. It increments or decrements the use * count of all subdev entities in the pipeline. * @@ -423,7 +423,7 @@ static int pipeline_pm_power(struct media_entity *entity, int change, return ret; } -int v4l2_pipeline_pm_use(struct media_entity *entity, int use) +static int v4l2_pipeline_pm_use(struct media_entity *entity, unsigned int use) { struct media_device *mdev = entity->graph_obj.mdev; int change = use ? 1 : -1; @@ -444,7 +444,19 @@ int v4l2_pipeline_pm_use(struct media_entity *entity, int use) return ret; } -EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_use); + +int v4l2_pipeline_pm_get(struct media_entity *entity) +{ + return v4l2_pipeline_pm_use(entity, 1); +} +EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_get); + +void v4l2_pipeline_pm_put(struct media_entity *entity) +{ + /* Powering off entities shouldn't fail. */ + WARN_ON(v4l2_pipeline_pm_use(entity, 0)); +} +EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_put); int v4l2_pipeline_link_notify(struct media_link *link, u32 flags, unsigned int notification) |