From 0c426c472b5585ed6e59160359c979506d45ae49 Mon Sep 17 00:00:00 2001 From: Sakari Ailus Date: Sun, 21 Feb 2016 13:25:08 -0300 Subject: [PATCH] [media] media: Always keep a graph walk large enough around Re-create the graph walk object as needed in order to have one large enough available for all entities in the graph. This enumeration is used for pipeline power management in the future. [mchehab@osg.samsung.com: fix documentation bug: " warning: bad line: graph_mutex"] Signed-off-by: Sakari Ailus Signed-off-by: Mauro Carvalho Chehab --- drivers/media/media-device.c | 21 +++++++++++++++++++++ include/media/media-device.h | 3 +++ 2 files changed, 24 insertions(+) diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c index 17cd349e485f..a2353ecab687 100644 --- a/drivers/media/media-device.c +++ b/drivers/media/media-device.c @@ -589,6 +589,26 @@ int __must_check media_device_register_entity(struct media_device *mdev, spin_unlock(&mdev->lock); + mutex_lock(&mdev->graph_mutex); + if (mdev->entity_internal_idx_max + >= mdev->pm_count_walk.ent_enum.idx_max) { + struct media_entity_graph new = { .top = 0 }; + + /* + * Initialise the new graph walk before cleaning up + * the old one in order not to spoil the graph walk + * object of the media device if graph walk init fails. + */ + ret = media_entity_graph_walk_init(&new, mdev); + if (ret) { + mutex_unlock(&mdev->graph_mutex); + return ret; + } + media_entity_graph_walk_cleanup(&mdev->pm_count_walk); + mdev->pm_count_walk = new; + } + mutex_unlock(&mdev->graph_mutex); + return 0; } EXPORT_SYMBOL_GPL(media_device_register_entity); @@ -667,6 +687,7 @@ void media_device_cleanup(struct media_device *mdev) { ida_destroy(&mdev->entity_internal_idx); mdev->entity_internal_idx_max = 0; + media_entity_graph_walk_cleanup(&mdev->pm_count_walk); mutex_destroy(&mdev->graph_mutex); } EXPORT_SYMBOL_GPL(media_device_cleanup); diff --git a/include/media/media-device.h b/include/media/media-device.h index 32bbba7d8115..df74cfa7da4a 100644 --- a/include/media/media-device.h +++ b/include/media/media-device.h @@ -306,6 +306,8 @@ struct media_entity_notify { * @entity_notify: List of registered entity_notify callbacks * @lock: Entities list lock * @graph_mutex: Entities graph operation lock + * @pm_count_walk: Graph walk for power state walk. Access serialised using + * graph_mutex. * * @source_priv: Driver Private data for enable/disable source handlers * @enable_source: Enable Source Handler function pointer @@ -373,6 +375,7 @@ struct media_device { spinlock_t lock; /* Serializes graph operations. */ struct mutex graph_mutex; + struct media_entity_graph pm_count_walk; void *source_priv; int (*enable_source)(struct media_entity *entity, -- 2.34.1