diff options
Diffstat (limited to 'drivers/dma-buf')
| -rw-r--r-- | drivers/dma-buf/reservation.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c index 4447e13d1e89..a6ac2b3a0185 100644 --- a/drivers/dma-buf/reservation.c +++ b/drivers/dma-buf/reservation.c @@ -56,6 +56,51 @@ const char reservation_seqcount_string[] = "reservation_seqcount"; EXPORT_SYMBOL(reservation_seqcount_string); /** + * reservation_object_init - initialize a reservation object + * @obj: the reservation object + */ +void reservation_object_init(struct reservation_object *obj) +{ + ww_mutex_init(&obj->lock, &reservation_ww_class); + + __seqcount_init(&obj->seq, reservation_seqcount_string, + &reservation_seqcount_class); + RCU_INIT_POINTER(obj->fence, NULL); + RCU_INIT_POINTER(obj->fence_excl, NULL); +} +EXPORT_SYMBOL(reservation_object_init); + +/** + * reservation_object_fini - destroys a reservation object + * @obj: the reservation object + */ +void reservation_object_fini(struct reservation_object *obj) +{ + int i; + struct reservation_object_list *fobj; + struct dma_fence *excl; + + /* + * This object should be dead and all references must have + * been released to it, so no need to be protected with rcu. + */ + excl = rcu_dereference_protected(obj->fence_excl, 1); + if (excl) + dma_fence_put(excl); + + fobj = rcu_dereference_protected(obj->fence, 1); + if (fobj) { + for (i = 0; i < fobj->shared_count; ++i) + dma_fence_put(rcu_dereference_protected(fobj->shared[i], 1)); + + kfree(fobj); + } + + ww_mutex_destroy(&obj->lock); +} +EXPORT_SYMBOL(reservation_object_fini); + +/** * reservation_object_reserve_shared - Reserve space to add shared fences to * a reservation_object. * @obj: reservation object |