This subtest verifies merging a fence with itself does not fail.

Signed-off-by: Robert Foss <robert.f...@collabora.com>
Reviewed-by: Eric Engestrom <e...@engestrom.ch>
Reviewed-by: Tomeu Vizoso <tomeu.viz...@collabora.com>
---
 tests/sw_sync.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/tests/sw_sync.c b/tests/sw_sync.c
index 7780c9e1..c0eade51 100644
--- a/tests/sw_sync.c
+++ b/tests/sw_sync.c
@@ -193,6 +193,30 @@ static void test_sync_merge(void)
        close(timeline);
 }
 
+static void test_sync_merge_same(void)
+{
+       int in_fence[2];
+       int timeline;
+       int signaled;
+
+       timeline = sw_sync_timeline_create();
+       in_fence[0] = sw_sync_fence_create(timeline, 1);
+       in_fence[1] = sync_merge(in_fence[0], in_fence[0]);
+
+       signaled = sync_fence_count_status(in_fence[0],
+                                             SW_SYNC_FENCE_STATUS_SIGNALED);
+       igt_assert_f(signaled == 0, "Fence signaled too early\n");
+
+       sw_sync_timeline_inc(timeline, 1);
+       signaled = sync_fence_count_status(in_fence[0],
+                                             SW_SYNC_FENCE_STATUS_SIGNALED);
+       igt_assert_f(signaled == 1, "Fence did not signal\n");
+
+       close(in_fence[0]);
+       close(in_fence[1]);
+       close(timeline);
+}
+
 igt_main
 {
        igt_subtest("alloc_timeline")
@@ -212,5 +236,8 @@ igt_main
 
        igt_subtest("sync_merge")
                test_sync_merge();
+
+       igt_subtest("sync_merge_same")
+               test_sync_merge_same();
 }
 
-- 
2.11.0

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