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

Yingjie Wang · alexdeucher · commit 25315ebfaefc · 2021-04-09T16:58:23.000-04:00
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: 9843ead ("drm/radeon: add DisplayPort MST support (v2)") Signed-off-by: Yingjie Wang <wangyingjie55@126.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git 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);
 }

Original file line number	Diff line number	Diff line change
`@@ -241,6 +241,9 @@ radeon_dp_mst_detect(struct drm_connector *connector,`
`241`	`241`	`to_radeon_connector(connector);`
`242`	`242`	`struct radeon_connector *master = radeon_connector->mst_port;`
`243`	`243`
	`244`	`+ if (drm_connector_is_unregistered(connector))`
	`245`	`+ return connector_status_disconnected;`
	`246`	`+`
`244`	`247`	`return drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr,`
`245`	`248`	`radeon_connector->port);`
`246`	`249`	`}`