[PATCH 3/5] dma-buf: further relax reservation_object_add_shared_fence

["Christian König" <ckoenig.leichtzumerken@gmail.com>]

Other cores don't busy wait any more and we removed the last user of checking
the seqno for changes. Drop updating the number for shared fences altogether.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/dma-buf/reservation.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c
index d59207ca72d2..6eaca469005f 100644
--- a/drivers/dma-buf/reservation.c
+++ b/drivers/dma-buf/reservation.c
@@ -206,9 +206,6 @@ void reservation_object_add_shared_fence(struct reservation_object *obj,
 	fobj = reservation_object_get_list(obj);
 	count = fobj->shared_count;
 
-	preempt_disable();
-	write_seqcount_begin(&obj->seq);
-
 	for (i = 0; i < count; ++i) {
 
 		old = rcu_dereference_protected(fobj->shared[i],
@@ -226,9 +223,6 @@ void reservation_object_add_shared_fence(struct reservation_object *obj,
 	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();
 	dma_fence_put(old);
 }
 EXPORT_SYMBOL(reservation_object_add_shared_fence);
-- 
2.17.1