[PATCH v5 11/20] drm/amdgpu/display: Keep malloc ref to MST port

[Lyude Paul]

Just like i915 and nouveau, it's a good idea for us to hold a malloc
reference to the port here so that we never pass a freed pointer to any
of the DP MST helper functions.

Also, we stop unsetting aconnector->port in
dm_dp_destroy_mst_connector(). There's literally no point to that
assignment that I can see anyway.

Signed-off-by: Lyude Paul <ly...@redhat.com>
Reviewed-by: Harry Wentland <harry.wentl...@amd.com>
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: David Airlie <airl...@redhat.com>
Cc: Jerry Zuo <jerry....@amd.com>
Cc: Juston Li <juston...@intel.com>
---
 .../drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c   | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

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 5e7ca1f3a8d1..24632727e127 100644
--- 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
@@ -191,6 +191,7 @@ dm_dp_mst_connector_destroy(struct drm_connector *connector)
        drm_encoder_cleanup(&amdgpu_encoder->base);
        kfree(amdgpu_encoder);
        drm_connector_cleanup(connector);
+       drm_dp_mst_put_port_malloc(amdgpu_dm_connector->port);
        kfree(amdgpu_dm_connector);
 }
 
@@ -363,7 +364,9 @@ dm_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
        amdgpu_dm_connector_funcs_reset(connector);
 
        DRM_INFO("DM_MST: added connector: %p [id: %d] [master: %p]\n",
-                       aconnector, connector->base.id, aconnector->mst_port);
+                aconnector, connector->base.id, aconnector->mst_port);
+
+       drm_dp_mst_get_port_malloc(port);
 
        DRM_DEBUG_KMS(":%d\n", connector->base.id);
 
@@ -379,12 +382,12 @@ static void dm_dp_destroy_mst_connector(struct 
drm_dp_mst_topology_mgr *mgr,
        struct amdgpu_dm_connector *aconnector = 
to_amdgpu_dm_connector(connector);
 
        DRM_INFO("DM_MST: Disabling connector: %p [id: %d] [master: %p]\n",
-                               aconnector, connector->base.id, 
aconnector->mst_port);
+                aconnector, connector->base.id, aconnector->mst_port);
 
-       aconnector->port = NULL;
        if (aconnector->dc_sink) {
                amdgpu_dm_update_freesync_caps(connector, NULL);
-               dc_link_remove_remote_sink(aconnector->dc_link, 
aconnector->dc_sink);
+               dc_link_remove_remote_sink(aconnector->dc_link,
+                                          aconnector->dc_sink);
                dc_sink_release(aconnector->dc_sink);
                aconnector->dc_sink = NULL;
        }
-- 
2.20.1

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