drm/amd/display: Fix memory leaks in S3 resume

EDID parsing in S3 resume pushes new display modes
to probed_modes list but doesn't consolidate to actual
mode list. This creates a race condition when
amdgpu_dm_connector_ddc_get_modes() re-initializes the
list head without walking the list and results in  memory leak.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=209987
Acked-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

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 8fac611..519080e 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2386,7 +2386,8 @@ void amdgpu_dm_update_connector_after_detect(
 
                        drm_connector_update_edid_property(connector,
                                                           aconnector->edid);
-                       drm_add_edid_modes(connector, aconnector->edid);
+                       aconnector->num_modes = drm_add_edid_modes(connector, aconnector->edid);
+                       drm_connector_list_update(connector);
 
                        if (aconnector->dc_link->aux_mode)
                                drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,