diff --git a/sys/dev/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/sys/dev/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
--- a/sys/dev/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/sys/dev/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -152,7 +152,7 @@
 	char *sub_str;
 	/* 0: lane_count; 1: link_rate */
 	uint8_t param_index = 0;
-	long param[2];
+	long param[2] = {0, 0};
 	const char delimiter[3] = {' ', '\n', '\0'};
 	bool valid_input = false;