From 872f2c72cfc130985bbb18c7c724cd3ae4555de8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Sun, 6 Jun 2021 11:46:33 +0200
Subject: dma-buf: fix dma_resv_test_signaled test_all handling v2
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Git-commit: 9d38814d1e346ea37a51cbf31f4424c9d059459e
Patch-mainline: v5.15-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

As the name implies if testing all fences is requested we
should indeed test all fences and not skip the exclusive
one because we see shared ones.

v2: fix logic once more

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210702111642.17259-3-christian.koenig@amd.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/dma-buf/dma-resv.c | 33 ++++++++++++---------------------
 1 file changed, 12 insertions(+), 21 deletions(-)

diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index f26c71747d43..e744fd87c63c 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -615,25 +615,21 @@ static inline int dma_resv_test_signaled_single(struct dma_fence *passed_fence)
  */
 bool dma_resv_test_signaled(struct dma_resv *obj, bool test_all)
 {
-	unsigned int seq, shared_count;
+	struct dma_fence *fence;
+	unsigned int seq;
 	int ret;
 
 	rcu_read_lock();
 retry:
 	ret = true;
-	shared_count = 0;
 	seq = read_seqcount_begin(&obj->seq);
 
 	if (test_all) {
 		struct dma_resv_list *fobj = dma_resv_shared_list(obj);
-		unsigned int i;
-
-		if (fobj)
-			shared_count = fobj->shared_count;
+		unsigned int i, shared_count;
 
+		shared_count = fobj ? fobj->shared_count : 0;
 		for (i = 0; i < shared_count; ++i) {
-			struct dma_fence *fence;
-
 			fence = rcu_dereference(fobj->shared[i]);
 			ret = dma_resv_test_signaled_single(fence);
 			if (ret < 0)
@@ -641,24 +637,19 @@ bool dma_resv_test_signaled(struct dma_resv *obj, bool test_all)
 			else if (!ret)
 				break;
 		}
-
-		if (read_seqcount_retry(&obj->seq, seq))
-			goto retry;
 	}
 
-	if (!shared_count) {
-		struct dma_fence *fence_excl = dma_resv_excl_fence(obj);
-
-		if (fence_excl) {
-			ret = dma_resv_test_signaled_single(fence_excl);
-			if (ret < 0)
-				goto retry;
+	fence = dma_resv_excl_fence(obj);
+	if (ret && fence) {
+		ret = dma_resv_test_signaled_single(fence);
+		if (ret < 0)
+			goto retry;
 
-			if (read_seqcount_retry(&obj->seq, seq))
-				goto retry;
-		}
 	}
 
+	if (read_seqcount_retry(&obj->seq, seq))
+		goto retry;
+
 	rcu_read_unlock();
 	return ret;
 }
-- 
2.38.1