drm/amd/display: Unlock on error path in dm_handle_mst_sideband_msg_ready_event()

This error path needs to unlock the "aconnector->handle_mst_msg_ready"
mutex before returning.

Fixes: 4f6d9e38c4d2 ("drm/amd/display: Add polling method to handle MST reply packet")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 888e80f..9bc86de 100644 (file)
--- 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
@@ -706,7 +706,7 @@ void dm_handle_mst_sideband_msg_ready_event(
 
                        if (retry == 3) {
                                DRM_ERROR("Failed to ack MST event.\n");
-                               return;
+                               break;
                        }
 
                        drm_dp_mst_hpd_irq_send_new_request(&aconnector->mst_mgr);