[Intel-gfx] [PATCH igt] igt/gem_exec_await: Flush the WCB before attempting to queue more work

[Chris Wilson]

Ensure that the terminating write into WC-memory is flushed before we
might trigger a wait for ring space.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 tests/gem_exec_await.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/gem_exec_await.c b/tests/gem_exec_await.c
index 9c4467922..28b280ff6 100644
--- a/tests/gem_exec_await.c
+++ b/tests/gem_exec_await.c
@@ -222,6 +222,7 @@ static void wide(int fd, int ring_size, int timeout, unsigned int flags)
 
 		for (unsigned e = 0; e < nengine; e++)
 			exec[e].cmd[0] = MI_BATCH_BUFFER_END;
+		__sync_synchronize();
 	}
 
 	igt_assert_eq(intel_detect_and_clear_missed_interrupts(fd), 0);
-- 
2.15.1