From 56d2e7596d4f84245866261481cf2640d03b5786 Mon Sep 17 00:00:00 2001
From: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Date: Mon, 25 Nov 2019 10:34:13 -0500
Subject: drm/amd/display: Null check aconnector in event_property_validate
Git-commit: 79c4ac0d759b6baaca22d7f37f6594a677030976
Patch-mainline: v5.6-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322

[Why]
previously event_property_validate was only called after we enabled the display.
But after "Refactor HDCP to handle multiple displays per link" this function
can be called at any time. In certain cases we don't have a aconnector

[How]
Null check aconnector and exit early. This is ok because we only need to check the
ENABLED->DESIRED transition if a connector exists.

Fixes: b1abe5586ffc ("drm/amd/display: Refactor HDCP to handle multiple displays per link")
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Zhan Liu <zhan.liu@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c
index f6864a51891a..ae329335dfcc 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c
@@ -225,6 +225,9 @@ static void event_property_validate(struct work_struct *work)
 	struct mod_hdcp_display_query query;
 	struct amdgpu_dm_connector *aconnector = hdcp_work->aconnector;
 
+	if (!aconnector)
+		return;
+
 	mutex_lock(&hdcp_work->mutex);
 
 	query.encryption_status = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF;
-- 
2.28.0