diff options
Diffstat (limited to 'drivers/dma-buf/reservation.c')
| -rw-r--r-- | drivers/dma-buf/reservation.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c index 5fb4fd461908..c1618335ca99 100644 --- a/drivers/dma-buf/reservation.c +++ b/drivers/dma-buf/reservation.c @@ -147,16 +147,17 @@ void reservation_object_add_shared_fence(struct reservation_object *obj, struct dma_fence *fence) { struct reservation_object_list *fobj; - unsigned int i; + unsigned int i, count; dma_fence_get(fence); fobj = reservation_object_get_list(obj); + count = fobj->shared_count; preempt_disable(); write_seqcount_begin(&obj->seq); - for (i = 0; i < fobj->shared_count; ++i) { + for (i = 0; i < count; ++i) { struct dma_fence *old_fence; old_fence = rcu_dereference_protected(fobj->shared[i], @@ -169,14 +170,13 @@ void reservation_object_add_shared_fence(struct reservation_object *obj, } BUG_ON(fobj->shared_count >= fobj->shared_max); - fobj->shared_count++; + count++; replace: - /* - * memory barrier is added by write_seqcount_begin, - * fobj->shared_count is protected by this lock too - */ RCU_INIT_POINTER(fobj->shared[i], fence); + /* pointer update must be visible before we extend the shared_count */ + smp_store_mb(fobj->shared_count, count); + write_seqcount_end(&obj->seq); preempt_enable(); } |