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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>
Cc: stable@vger.kernel.org
This commit is contained in:
Andrey Grodzovsky 2020-10-14 13:12:30 -04:00 committed by Alex Deucher
parent 0d427f6c29
commit 5dff80bdce
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -5063,6 +5063,13 @@ 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)