[media] media: Introduce internal index for media entities

[deliverable/linux.git] / drivers / media / media-device.c

diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index 30e3354d7481480034c2ec6a96dc8ccb13976ab0..ce97f8f196f3b8399163567a3be5d5e18a118f99 100644 (file)
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -22,6 +22,7 @@
 
 #include <linux/compat.h>
 #include <linux/export.h>
+#include <linux/idr.h>
 #include <linux/ioctl.h>
 #include <linux/media.h>
 #include <linux/slab.h>
@@ -551,6 +552,17 @@ int __must_check media_device_register_entity(struct media_device *mdev,
        entity->num_backlinks = 0;
 
        spin_lock(&mdev->lock);
+
+       entity->internal_idx = ida_simple_get(&mdev->entity_internal_idx, 1, 0,
+                                             GFP_KERNEL);
+       if (entity->internal_idx < 0) {
+               spin_unlock(&mdev->lock);
+               return entity->internal_idx;
+       }
+
+       mdev->entity_internal_idx_max =
+               max(mdev->entity_internal_idx_max, entity->internal_idx);
+
        /* Initialize media_gobj embedded at the entity */
        media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
 
@@ -579,6 +591,8 @@ static void __media_device_unregister_entity(struct media_entity *entity)
        struct media_interface *intf;
        unsigned int i;
 
+       ida_simple_remove(&mdev->entity_internal_idx, entity->internal_idx);
+
        /* Remove all interface links pointing to this entity */
        list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
                list_for_each_entry_safe(link, tmp, &intf->links, list) {
@@ -632,6 +646,7 @@ void media_device_init(struct media_device *mdev)
        INIT_LIST_HEAD(&mdev->links);
        spin_lock_init(&mdev->lock);
        mutex_init(&mdev->graph_mutex);
+       ida_init(&mdev->entity_internal_idx);
 
        dev_dbg(mdev->dev, "Media device initialized\n");
 }
@@ -644,6 +659,8 @@ EXPORT_SYMBOL_GPL(media_device_init);
  */
 void media_device_cleanup(struct media_device *mdev)
 {
+       ida_destroy(&mdev->entity_internal_idx);
+       mdev->entity_internal_idx_max = 0;
        mutex_destroy(&mdev->graph_mutex);
 }
 EXPORT_SYMBOL_GPL(media_device_cleanup);