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From a0f68e9ed71f14e26b1811ebd9a360e7b282895d Mon Sep 17 00:00:00 2001
From: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Date: Thu, 29 Mar 2018 16:39:10 -0400
Subject: [PATCH 4206/5725] drm/amd/display: fix segfault on insufficient TG
 during validation

Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index 81c6de7..7f79258 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -1699,7 +1699,7 @@ enum dc_status resource_map_pool_resources(
 		pipe_idx = acquire_first_split_pipe(&context->res_ctx, pool, stream);
 #endif
 
-	if (pipe_idx < 0)
+	if (pipe_idx < 0 || context->res_ctx.pipe_ctx[pipe_idx].stream_res.tg == NULL)
 		return DC_NO_CONTROLLER_RESOURCE;
 
 	pipe_ctx = &context->res_ctx.pipe_ctx[pipe_idx];
-- 
2.7.4