[PATCH V2] dma-buf: Fix missing excl fence waiting

[PATCH V2] dma-buf: Fix missing excl fence waiting

[Pan, Xinhui]

If shared fence list is not empty, even we want to test all fences, excl fence is ignored.
That is abviously wrong, so fix it.

Signed-off-by: xinhui pan <xinhui.pan@amd.com>
---
change from v1:
init left correctly
---
 drivers/dma-buf/dma-resv.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 4264e64788c4..82e4b4f63bef 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -632,13 +632,13 @@ static inline int dma_resv_test_signaled_single(struct dma_fence *passed_fence)
  */
 bool dma_resv_test_signaled_rcu(struct dma_resv *obj, bool test_all)
 {
-	unsigned seq, shared_count;
+	unsigned int seq, shared_count, left;
 	int ret;
 
 	rcu_read_lock();
 retry:
 	ret = true;
-	shared_count = 0;
+	left = shared_count = 0;
 	seq = read_seqcount_begin(&obj->seq);
 
 	if (test_all) {
@@ -647,7 +647,7 @@ bool dma_resv_test_signaled_rcu(struct dma_resv *obj, bool test_all)
 		struct dma_resv_list *fobj = rcu_dereference(obj->fence);
 
 		if (fobj)
-			shared_count = fobj->shared_count;
+			left = shared_count = fobj->shared_count;
 
 		for (i = 0; i < shared_count; ++i) {
 			struct dma_fence *fence = rcu_dereference(fobj->shared[i]);
@@ -657,13 +657,14 @@ bool dma_resv_test_signaled_rcu(struct dma_resv *obj, bool test_all)
 				goto retry;
 			else if (!ret)
 				break;
+			left--;
 		}
 
 		if (read_seqcount_retry(&obj->seq, seq))
 			goto retry;
 	}
 
-	if (!shared_count) {
+	if (!left) {
 		struct dma_fence *fence_excl = rcu_dereference(obj->fence_excl);
 
 		if (fence_excl) {
-- 
2.21.0 (Apple Git-122)