drm: fix missing reference counting decrease

commit dabe19540af9e563d526113bb102e1b9b9fa73f9 upstream.

In drm_dp_mst_allocate_vcpi, it returns true in two paths,
but in one path, there is no reference couting decrease.

Signed-off-by: Insu Yun <wuninsu@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index bbda11f248446541eb14f07e56eccd37822b813c..39d7e2e15c11e4603d8c889cc48bc507729b495d 100644 (file)
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2463,6 +2463,7 @@ bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp
                DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
                if (pbn == port->vcpi.pbn) {
                        *slots = port->vcpi.num_slots;
+                       drm_dp_put_port(port);
                        return true;
                }
        }