[PATCH i-g-t 1/7] tests/intel/kms_dp_linktrain_fallback: refactor find_mst_outputs

[Kunal Joshi <kunal1.joshi@intel.com>]

refactor find_mst_outputs to improve error handling

v2: change return type to int (Ankit)

Signed-off-by: Kunal Joshi <kunal1.joshi@intel.com>
---
 tests/intel/kms_dp_linktrain_fallback.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/tests/intel/kms_dp_linktrain_fallback.c b/tests/intel/kms_dp_linktrain_fallback.c
index 415005774..edf9409b6 100644
--- a/tests/intel/kms_dp_linktrain_fallback.c
+++ b/tests/intel/kms_dp_linktrain_fallback.c
@@ -47,26 +47,33 @@ typedef int (*condition_check_fn)(int drm_fd, igt_output_t *output);
 
 IGT_TEST_DESCRIPTION("Test link training fallback");
 
-static void find_mst_outputs(int drm_fd, data_t *data,
-			     igt_output_t *output,
-			     igt_output_t *mst_outputs[],
-			     int *num_mst_outputs)
+static int find_mst_outputs(int drm_fd, igt_display_t *display,
+			    igt_output_t *output,
+			    igt_output_t *mst_outputs[],
+			    int *num_mst_outputs)
 {
 	int output_root_id, root_id;
 	igt_output_t *connector_output;
 
+	if (!igt_check_output_is_dp_mst(output))
+		return -EINVAL;
+
 	output_root_id = igt_get_dp_mst_connector_id(output);
+	if (output_root_id == -EINVAL)
+		return -EINVAL;
 	/*
 	 * If output is MST check all other connected output which shares
 	 * same path and fill mst_outputs and num_mst_outputs
 	 */
-	for_each_connected_output(&data->display, connector_output) {
+	for_each_connected_output(display, connector_output) {
 		if (!igt_check_output_is_dp_mst(connector_output))
 			continue;
+
 		root_id = igt_get_dp_mst_connector_id(connector_output);
 		if (((*num_mst_outputs) < IGT_MAX_PIPES) && root_id == output_root_id)
 			mst_outputs[(*num_mst_outputs)++] = connector_output;
 	}
+	return 0;
 }
 
 static bool setup_mst_outputs(data_t *data, igt_output_t *mst_output[],
@@ -83,8 +90,10 @@ static bool setup_mst_outputs(data_t *data, igt_output_t *mst_output[],
 		    traversed_mst_outputs[i] == data->output->config.connector->connector_id)
 			return false;
 
-	find_mst_outputs(data->drm_fd, data, data->output,
-			 mst_output, output_count);
+	igt_assert_f(find_mst_outputs(data->drm_fd, &data->display,
+				      data->output, mst_output,
+				      output_count) == 0,
+				      "Unable to find mst outputs or given optput is not mst\n");
 
 	for (i = 0; i < *output_count; i++) {
 		output = mst_output[i];
-- 
2.25.1