Add new versions of media_pipeline_start() and media_pipeline_stop().
The new functions can be used by drivers that do not need to extend the
media_pipeline with their own structs, and the new functions will handle
allocating and freeing the media_pipeline as needed.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
---
drivers/media/mc/mc-entity.c | 49 ++++++++++++++++++++++++++++++++++++
include/media/media-entity.h | 22 ++++++++++++++++
2 files changed, 71 insertions(+)
diff --git a/drivers/media/mc/mc-entity.c b/drivers/media/mc/mc-entity.c
index 0d0d6c0dda16..b7b6c6411aa7 100644
--- a/drivers/media/mc/mc-entity.c
+++ b/drivers/media/mc/mc-entity.c
@@ -579,6 +579,55 @@ void media_pipeline_stop(struct media_entity *entity)
}
EXPORT_SYMBOL_GPL(media_pipeline_stop);
+__must_check int media_pipeline_alloc_start(struct media_entity *entity)
+{
+ struct media_device *mdev = entity->graph_obj.mdev;
+ struct media_pipeline *pipe;
+ int ret;
+ bool new_pipe = false;
+
+ mutex_lock(&mdev->graph_mutex);
+
+ /*
+ * Is the entity already part of a pipeline? If not, we need to allocate
+ * a pipe.
+ */
+ pipe = media_entity_pipeline(entity);
+ if (!pipe) {
+ pipe = kzalloc(sizeof(*pipe), GFP_KERNEL);
+ new_pipe = true;
+ }
+
+ ret = __media_pipeline_start(entity, pipe);
+ if (ret) {
+ if (new_pipe)
+ kfree(pipe);
+ }
+
+ mutex_unlock(&mdev->graph_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(media_pipeline_alloc_start);
+
+void media_pipeline_stop_free(struct media_entity *entity)
+{
+ struct media_device *mdev = entity->graph_obj.mdev;
+ struct media_pipeline *pipe;
+
+ mutex_lock(&mdev->graph_mutex);
+
+ pipe = media_entity_pipeline(entity);
+
+ __media_pipeline_stop(entity);
+
+ if (pipe && pipe->start_count == 0)
+ kfree(pipe);
+
+ mutex_unlock(&mdev->graph_mutex);
+}
+EXPORT_SYMBOL_GPL(media_pipeline_stop_free);
+
/* -----------------------------------------------------------------------------
* Links management
*/
diff --git a/include/media/media-entity.h b/include/media/media-entity.h
index 6c0d0a00d58e..13a882a7839c 100644
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -1035,6 +1035,28 @@ void media_pipeline_stop(struct media_entity *entity);
*/
void __media_pipeline_stop(struct media_entity *entity);
+/**
+ * media_pipeline_alloc_start - Mark a pipeline as streaming
+ * @entity: Starting entity
+ *
+ * media_pipeline_alloc_start() is similar to media_pipeline_start() but
+ * instead of working on a given pipeline the function will allocate a new
+ * pipeline if needed.
+ *
+ * Calls to media_pipeline_alloc_start() must be matched with
+ * media_pipeline_stop_free().
+ */
+__must_check int media_pipeline_alloc_start(struct media_entity *entity);
+
+/**
+ * media_pipeline_stop_free - Mark a pipeline as not streaming
+ * @entity: Starting entity
+ *
+ * media_pipeline_stop_free() is similar to media_pipeline_stop() but will
+ * also free the pipeline when the start_count drops to 0.
+ */
+void media_pipeline_stop_free(struct media_entity *entity);
+
/**
* media_devnode_create() - creates and initializes a device node interface
*
--
2.34.1
