From 8dd15c8815093142794e7b7e6935dc5ac586f3e9 Mon Sep 17 00:00:00 2001
From: Jimmy Kizito <Jimmy.Kizito@amd.com>
Date: Sun, 12 Sep 2021 11:21:52 -0400
Subject: drm/amd/display: Fix null pointer dereference for encoders
Git-commit: 60f39edd897ea134a4ddb789a6795681691c3183
Patch-mainline: v5.16-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]
Links which are dynamically assigned link encoders have their link
encoder set to NULL.

[How]
Check that a pointer to a link_encoder object is non-NULL before using
it.

Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Jimmy Kizito <Jimmy.Kizito@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_link_dp.c          | 2 +-
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index e2bc26f22ac0..6c6496257da4 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -5698,7 +5698,7 @@ enum dc_status dp_set_fec_ready(struct dc_link *link, bool ready)
 				link_enc->funcs->fec_set_ready(link_enc, true);
 				link->fec_state = dc_link_fec_ready;
 			} else {
-				link_enc->funcs->fec_set_ready(link->link_enc, false);
+				link_enc->funcs->fec_set_ready(link_enc, false);
 				link->fec_state = dc_link_fec_not_ready;
 				dm_error("dpcd write failed to set fec_ready");
 			}
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index e1edbfa761f1..c5e2b4f138fd 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -1587,7 +1587,7 @@ void dcn10_power_down_on_boot(struct dc *dc)
 		for (i = 0; i < dc->link_count; i++) {
 			struct dc_link *link = dc->links[i];
 
-			if (link->link_enc->funcs->is_dig_enabled &&
+			if (link->link_enc && link->link_enc->funcs->is_dig_enabled &&
 					link->link_enc->funcs->is_dig_enabled(link->link_enc) &&
 					dc->hwss.power_down) {
 				dc->hwss.power_down(dc);
-- 
2.38.1