drm/amd/display: Avoid MST manager resource leak.

On connector destruction call drm_dp_mst_topology_mgr_destroy
to release resources allocated in drm_dp_mst_topology_mgr_init.
Do it only if MST manager was initilized before otherwsie a crash
is seen on driver unload/device unplug.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index e148e32..dd9a08d 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -5185,6 +5185,13 @@ static void amdgpu_dm_connector_destroy(struct drm_connector *connector)
        struct amdgpu_device *adev = drm_to_adev(connector->dev);
        struct amdgpu_display_manager *dm = &adev->dm;
 
+       /*
+        * Call only if mst_mgr was iniitalized before since it's not done
+        * for all connector types.
+        */
+       if (aconnector->mst_mgr.dev)
+               drm_dp_mst_topology_mgr_destroy(&aconnector->mst_mgr);
+
 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) ||\
        defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)