From 25315ebfaefcffd126a266116b37bb8a3d1c4620 Mon Sep 17 00:00:00 2001
From: Yingjie Wang <wangyingjie55@126.com>
Date: Tue, 6 Apr 2021 20:10:04 -0700
Subject: drm/radeon: Fix a missing check bug in radeon_dp_mst_detect()
Git-commit: 25315ebfaefcffd126a266116b37bb8a3d1c4620
Patch-mainline: v5.13-rc1
References: bsc#1152489
In radeon_dp_mst_detect(), We should check whether or not @connector
has been unregistered from userspace. If the connector is unregistered,
we should return disconnected status.
Fixes: 9843ead08f18 ("drm/radeon: add DisplayPort MST support (v2)")
Signed-off-by: Yingjie Wang <wangyingjie55@126.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/radeon/radeon_dp_mst.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/radeon/radeon_dp_mst.c
+++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c
@@ -245,6 +245,9 @@ radeon_dp_mst_detect(struct drm_connecto
struct radeon_connector *radeon_connector = to_radeon_connector(connector);
struct radeon_connector *master = radeon_connector->mst_port;
+ if (drm_connector_is_unregistered(connector))
+ return connector_status_disconnected;
+
return drm_dp_mst_detect_port(connector, &master->mst_mgr, radeon_connector->port);
}