From: Yongqiang Sun <yongqiang.sun@amd.com>
Date: Wed, 21 Dec 2016 11:16:48 -0500
Subject: drm/amd/display: don't crash if stream is NULL when trying to share
 clocks
Git-commit: 0f4e66cd7dac538adca4b1cac8f36b90db1709e6
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@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/core/dc_resource.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -288,6 +288,11 @@ static bool is_sharable_clk_src(
 	if (pipe_with_clk_src->clock_source == NULL)
 		return false;
 
+	if (pipe_with_clk_src->stream == NULL) {
+		ASSERT(0);
+		return false;
+	}
+
 	if (pipe_with_clk_src->stream->signal == SIGNAL_TYPE_VIRTUAL)
 		return false;