linux-kernel - [PATCH v1] drm/amd/dc: Fix a missing check bug in dm_dp_mst

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Date:   Thu,  8 Apr 2021 17:57:20 -0700
From:   wangyingjie55@....com
To:     harry.wentland@....com, sunpeng.li@....com,
        alexander.deucher@....com, christian.koenig@....com,
        airlied@...ux.ie, daniel@...ll.ch, mikita.lipski@....com,
        eryk.brol@....com, aurabindo.pillai@....com, Wayne.Lin@....com,
        luben.tuikov@....com
Cc:     wangyingjie55@....com, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] drm/amd/dc: Fix a missing check bug in dm_dp_mst_detect()

From: Yingjie Wang <wangyingjie55@....com>

In dm_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: 4562236b3bc0 ("drm/amd/dc: Add dc display driver (v2)")
Signed-off-by: Yingjie Wang <wangyingjie55@....com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 8ab0b9060d2b..103dfd0e9b65 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -271,6 +271,9 @@ dm_dp_mst_detect(struct drm_connector *connector,
 	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
 	struct amdgpu_dm_connector *master = aconnector->mst_port;
 
+	if (drm_connector_is_unregistered(connector))
+		return connector_status_disconnected;
+
 	return drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr,
 				      aconnector->port);
 }
-- 
2.7.4