lib: Add helper to wait and close fence fd

Get rid of some copy/pasta and open coding of a common pattern, waiting
for GPU commands to complete.

Signed-off-by: Rob Clark <robdclark@chromium.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/igt_aux.c b/lib/igt_aux.c
index 15e304407..672d7d4b0 100644
--- a/lib/igt_aux.c
+++ b/lib/igt_aux.c
@@ -1919,3 +1919,14 @@ void *igt_memdup(const void *ptr, size_t len)
 
 	return dup;
 }
+
+/**
+ * igt_wait_and_close: helper to wait on a fence-fd and then close it
+ *
+ * @fence_fd: the fence-fd to wait on and close
+ */
+void igt_wait_and_close(int fence_fd)
+{
+	poll(&(struct pollfd){fence_fd, POLLIN}, 1, -1);
+	close(fence_fd);
+}