[media] media: move mdev list init to gobj

Let's control the topology changes inside the graph_object. So, move the
addition and removal of interfaces/entities from the mdev lists to
media_gobj_init() and media_gobj_remove().

The main reason is that mdev should have lists for all object types, as
the new MC api will require to store objects in separate places.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/media-device.c

@@ -415,7 +415,7 @@ void media_device_unregister(struct media_device *mdev)
 	struct media_entity *entity;
 	struct media_entity *next;
 
-	list_for_each_entry_safe(entity, next, &mdev->entities, list)
+	list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
 		media_device_unregister_entity(entity);
 
 	device_remove_file(&mdev->devnode.dev, &dev_attr_model);
@@ -449,7 +449,6 @@ int __must_check media_device_register_entity(struct media_device *mdev,
 	spin_lock(&mdev->lock);
 	/* Initialize media_gobj embedded at the entity */
 	media_gobj_init(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
-	list_add_tail(&entity->list, &mdev->entities);
 
 	/* Initialize objects at the pads */
 	for (i = 0; i < entity->num_pads; i++)
@@ -487,7 +486,6 @@ void media_device_unregister_entity(struct media_entity *entity)
 	for (i = 0; i < entity->num_pads; i++)
 		media_gobj_remove(&entity->pads[i].graph_obj);
 	media_gobj_remove(&entity->graph_obj);
-	list_del(&entity->list);
 	spin_unlock(&mdev->lock);
 	entity->graph_obj.mdev = NULL;
 }

drivers/media/media-entity.c

@@ -158,6 +158,7 @@ void media_gobj_init(struct media_device *mdev,
 	switch (type) {
 	case MEDIA_GRAPH_ENTITY:
 		gobj->id = media_gobj_gen_id(type, ++mdev->entity_id);
+		list_add_tail(&gobj->list, &mdev->entities);
 		break;
 	case MEDIA_GRAPH_PAD:
 		gobj->id = media_gobj_gen_id(type, ++mdev->pad_id);
@@ -166,6 +167,7 @@ void media_gobj_init(struct media_device *mdev,
 		gobj->id = media_gobj_gen_id(type, ++mdev->link_id);
 		break;
 	case MEDIA_GRAPH_INTF_DEVNODE:
+		list_add_tail(&gobj->list, &mdev->interfaces);
 		gobj->id = media_gobj_gen_id(type, ++mdev->intf_devnode_id);
 		break;
 	}
@@ -181,6 +183,16 @@ void media_gobj_init(struct media_device *mdev,
  */
 void media_gobj_remove(struct media_gobj *gobj)
 {
+	/* Remove the object from mdev list */
+	switch (media_type(gobj)) {
+	case MEDIA_GRAPH_ENTITY:
+	case MEDIA_GRAPH_INTF_DEVNODE:
+		list_del(&gobj->list);
+		break;
+	default:
+		break;
+	}
+
 	dev_dbg_obj(__func__, gobj);
 }
 
@@ -852,8 +864,6 @@ static void media_interface_init(struct media_device *mdev,
 	INIT_LIST_HEAD(&intf->links);
 
 	media_gobj_init(mdev, gobj_type, &intf->graph_obj);
-
-	list_add_tail(&intf->list, &mdev->interfaces);
 }
 
 /* Functions related to the media interface via device nodes */
@@ -882,7 +892,6 @@ EXPORT_SYMBOL_GPL(media_devnode_create);
 void media_devnode_remove(struct media_intf_devnode *devnode)
 {
 	media_gobj_remove(&devnode->intf.graph_obj);
-	list_del(&devnode->intf.list);
 	kfree(devnode);
 }
 EXPORT_SYMBOL_GPL(media_devnode_remove);

include/media/media-device.h

@@ -111,11 +111,11 @@ struct media_device *media_device_find_devres(struct device *dev);
 
 /* Iterate over all entities. */
 #define media_device_for_each_entity(entity, mdev)			\
-	list_for_each_entry(entity, &(mdev)->entities, list)
+	list_for_each_entry(entity, &(mdev)->entities, graph_obj.list)
 
 /* Iterate over all interfaces. */
 #define media_device_for_each_intf(intf, mdev)			\
-	list_for_each_entry(intf, &(mdev)->interfaces, list)
+	list_for_each_entry(intf, &(mdev)->interfaces, graph_obj.list)
 
 
 #else

include/media/media-entity.h

@@ -66,6 +66,7 @@ enum media_gobj_type {
 struct media_gobj {
 	struct media_device	*mdev;
 	u32			id;
+	struct list_head	list;
 };
 
 
@@ -114,7 +115,6 @@ struct media_entity_operations {
 
 struct media_entity {
 	struct media_gobj graph_obj;	/* must be first field in struct */
-	struct list_head list;
 	const char *name;		/* Entity name */
 	u32 type;			/* Entity type (MEDIA_ENT_T_*) */
 	u32 revision;			/* Entity revision, driver specific */
@@ -166,7 +166,6 @@ struct media_entity {
  */
 struct media_interface {
 	struct media_gobj		graph_obj;
-	struct list_head		list;
 	struct list_head		links;
 	u32				type;
 	u32				flags;