drm/radeon: Fix a missing check bug in radeon_dp_mst_detect()

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 <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c
index 66a0e736cc4daa04a7083c46c651d3540dfcdcb5..59cf1d288465a1741a346f12315e717b3aa9487c 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_dp_mst.c
+++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c
@@ -241,6 +241,9 @@ radeon_dp_mst_detect(struct drm_connector *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, ctx, &master->mst_mgr,
                                      radeon_connector->port);
 }