diff options
Diffstat (limited to 'drivers/media/media-entity.c')
| -rw-r--r-- | drivers/media/media-entity.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c index df72f7d99d80..cb30ffbd5ba8 100644 --- a/drivers/media/media-entity.c +++ b/drivers/media/media-entity.c @@ -429,6 +429,56 @@ media_entity_create_link(struct media_entity *source, u16 source_pad, } EXPORT_SYMBOL_GPL(media_entity_create_link); +void __media_entity_remove_links(struct media_entity *entity) +{ + unsigned int i; + + for (i = 0; i < entity->num_links; i++) { + struct media_link *link = &entity->links[i]; + struct media_entity *remote; + unsigned int r = 0; + + if (link->source->entity == entity) + remote = link->sink->entity; + else + remote = link->source->entity; + + while (r < remote->num_links) { + struct media_link *rlink = &remote->links[r]; + + if (rlink != link->reverse) { + r++; + continue; + } + + if (link->source->entity == entity) + remote->num_backlinks--; + + if (--remote->num_links == 0) + break; + + /* Insert last entry in place of the dropped link. */ + *rlink = remote->links[remote->num_links]; + } + } + + entity->num_links = 0; + entity->num_backlinks = 0; +} +EXPORT_SYMBOL_GPL(__media_entity_remove_links); + +void media_entity_remove_links(struct media_entity *entity) +{ + /* Do nothing if the entity is not registered. */ + if (entity->parent == NULL) + return; + + mutex_lock(&entity->parent->graph_mutex); + __media_entity_remove_links(entity); + mutex_unlock(&entity->parent->graph_mutex); +} +EXPORT_SYMBOL_GPL(media_entity_remove_links); + static int __media_entity_setup_link_notify(struct media_link *link, u32 flags) { int ret; |