drm/amd/dc: Fix a missing check bug in dm_dp_mst_detect()

[ Upstream commit 655c0ed19772d92c9665ed08bdc5202acc096dda ]

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@126.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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 1e448f1b39a1862589dacce3b91ed7cf366edd14..955a055bd9800f738a466f7840e9c8226034ba19 100644 (file)
--- 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
@@ -268,6 +268,9 @@ 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);
 }