[media] media: add a linked list to track interfaces by mdev
The media device should list the interface objects, so add a linked list
for those interfaces in struct media_device.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index 3e649ca..659507b 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -381,6 +381,7 @@
return -EINVAL;
INIT_LIST_HEAD(&mdev->entities);
+ INIT_LIST_HEAD(&mdev->interfaces);
spin_lock_init(&mdev->lock);
mutex_init(&mdev->graph_mutex);
diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
index d15797e..8449274 100644
--- a/drivers/media/media-entity.c
+++ b/drivers/media/media-entity.c
@@ -849,6 +849,8 @@
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 */
@@ -877,6 +879,7 @@
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);
diff --git a/include/media/media-device.h b/include/media/media-device.h
index 3b14394..51807ef 100644
--- a/include/media/media-device.h
+++ b/include/media/media-device.h
@@ -46,6 +46,7 @@
* @link_id: Unique ID used on the last link registered
* @intf_devnode_id: Unique ID used on the last interface devnode registered
* @entities: List of registered entities
+ * @interfaces: List of registered interfaces
* @lock: Entities list lock
* @graph_mutex: Entities graph operation lock
* @link_notify: Link state change notification callback
@@ -77,6 +78,7 @@
u32 intf_devnode_id;
struct list_head entities;
+ struct list_head interfaces;
/* Protects the entities list */
spinlock_t lock;
diff --git a/include/media/media-entity.h b/include/media/media-entity.h
index d64e8cb..ca35e07 100644
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -156,6 +156,8 @@
* struct media_intf_devnode - Define a Kernel API interface
*
* @graph_obj: embedded graph object
+ * @list: Linked list used to find other interfaces that belong
+ * to the same media controller
* @links: List of links pointing to graph entities
* @type: Type of the interface as defined at the
* uapi/media/media.h header, e. g.
@@ -164,6 +166,7 @@
*/
struct media_interface {
struct media_gobj graph_obj;
+ struct list_head list;
struct list_head links;
u32 type;
u32 flags;