diff options
Diffstat (limited to 'include/linux/fence.h')
| -rw-r--r-- | include/linux/fence.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/fence.h b/include/linux/fence.h index b935cc65012..d174585b874 100644 --- a/include/linux/fence.h +++ b/include/linux/fence.h @@ -28,6 +28,7 @@ #include <linux/kref.h> #include <linux/sched.h> #include <linux/printk.h> +#include <linux/rcupdate.h> struct fence; struct fence_ops; @@ -37,6 +38,7 @@ struct fence_cb; * struct fence - software synchronization primitive * @refcount: refcount for this fence * @ops: fence_ops associated with this fence + * @rcu: used for releasing fence with kfree_rcu * @cb_list: list of all callbacks to call * @lock: spin_lock_irqsave used for locking * @context: execution context this fence belongs to, returned by @@ -70,6 +72,7 @@ struct fence_cb; struct fence { struct kref refcount; const struct fence_ops *ops; + struct rcu_head rcu; struct list_head cb_list; spinlock_t *lock; unsigned context, seqno; @@ -192,6 +195,20 @@ static inline struct fence *fence_get(struct fence *fence) } /** + * fence_get_rcu - get a fence from a reservation_object_list with rcu read lock + * @fence: [in] fence to increase refcount of + * + * Function returns NULL if no refcount could be obtained, or the fence. + */ +static inline struct fence *fence_get_rcu(struct fence *fence) +{ + if (kref_get_unless_zero(&fence->refcount)) + return fence; + else + return NULL; +} + +/** * fence_put - decreases refcount of the fence * @fence: [in] fence to reduce refcount of */ |