From: Harry Wentland <harry.wentland@amd.com>
Date: Tue, 13 Feb 2018 11:07:43 -0500
Subject: drm/amd/display: Don't blow up if TG is NULL in dce110_vblank_set
Git-commit: 3573d598b800f4979c78b829af3280af3d412ea3
Patch-mainline: v4.16-rc5
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/irq/dce110/irq_service_dce110.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/display/dc/irq/dce110/irq_service_dce110.c
+++ b/drivers/gpu/drm/amd/display/dc/irq/dce110/irq_service_dce110.c
@@ -217,7 +217,7 @@ bool dce110_vblank_set(
 			core_dc->current_state->res_ctx.pipe_ctx[pipe_offset].stream_res.tg;
 
 	if (enable) {
-		if (!tg->funcs->arm_vert_intr(tg, 2)) {
+		if (!tg || !tg->funcs->arm_vert_intr(tg, 2)) {
 			DC_ERROR("Failed to get VBLANK!\n");
 			return false;
 		}