From 86233430806fce9a227fbd66e628535a34dcc786 Mon Sep 17 00:00:00 2001
From: Chris Park <Chris.Park@amd.com>
Date: Mon, 28 Feb 2022 10:23:00 -0500
Subject: drm/amd/display: Add NULL check
Git-commit: 84ce38c7bf7a19fb1f9cc61181e830b7e04dd51d
Patch-mainline: v5.18-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

[Why]
Virtualization enters blue screen of death (BSoD)
due to NULL res_pool object when accessing DSC
encoder capability.

[How]
Add NULL check to avoid blue screen of death.

Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Chris Park <Chris.Park@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 3 +++
 1 file changed, 3 insertions(+)

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 bc2150f3d79b..7af153434e9e 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -2335,6 +2335,9 @@ void dc_resource_state_construct(
 
 bool dc_resource_is_dsc_encoding_supported(const struct dc *dc)
 {
+	if (dc->res_pool == NULL)
+		return false;
+
 	return dc->res_pool->res_cap->num_dsc > 0;
 }
 
-- 
2.38.1