drm/amd/display: Decrement refcount of dc_sink before reassignment

[ Upstream commit 8e92bb0fa75bca9a57e4aba2e36f67d8016a3053 ]

[why]
An old dc_sink state is causing a memory leak because it is missing a
dc_sink_release before a new dc_sink is assigned back to
aconnector->dc_sink.

[how]
Decrement the dc_sink refcount before reassigning it to a new dc_sink.

Signed-off-by: Victor Lu <victorchengchi.lu@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@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 321df20..fdca76f 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2261,8 +2261,10 @@ void amdgpu_dm_update_connector_after_detect(
                 * TODO: check if we still need the S3 mode update workaround.
                 * If yes, put it here.
                 */
-               if (aconnector->dc_sink)
+               if (aconnector->dc_sink) {
                        amdgpu_dm_update_freesync_caps(connector, NULL);
+                       dc_sink_release(aconnector->dc_sink);
+               }
 
                aconnector->dc_sink = sink;
                dc_sink_retain(aconnector->dc_sink);