[PATCH RESEND] drm: i915: fix a possible refcount leak in intel_dp_add_mst_connector()

[Hangyu Hua]

If drm_connector_init fails, intel_connector_free will be called to take
care of proper free. So it is necessary to drop the refcount of port
before intel_connector_free.

Fixes: 091a4f91942a ("drm/i915: Handle drm-layer errors in 
intel_dp_add_mst_connector")
Signed-off-by: Hangyu Hua <hbh...@gmail.com>
Reviewed-by: José Roberto de Souza <jose.so...@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_mst.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c 
b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 061b277e5ce7..14d2a64193b2 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -839,6 +839,7 @@ static struct drm_connector 
*intel_dp_add_mst_connector(struct drm_dp_mst_topolo
        ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
                                 DRM_MODE_CONNECTOR_DisplayPort);
        if (ret) {
+               drm_dp_mst_put_port_malloc(port);
                intel_connector_free(intel_connector);
                return NULL;
        }
-- 
2.25.1