diff --git a/vendor/github.com/opencord/voltha-go/rw_core/coreIf/device_manager_if.go b/vendor/github.com/opencord/voltha-go/rw_core/coreIf/device_manager_if.go
index ec191dc..367f442 100644
--- a/vendor/github.com/opencord/voltha-go/rw_core/coreIf/device_manager_if.go
+++ b/vendor/github.com/opencord/voltha-go/rw_core/coreIf/device_manager_if.go
@@ -25,4 +25,13 @@
 type DeviceManager interface {
 	GetDevice(string) (*voltha.Device, error)
 	IsRootDevice(string) (bool, error)
+	NotifyInvalidTransition(*voltha.Device) error
+	SetAdminStateToEnable(*voltha.Device) error
+	CreateLogicalDevice(*voltha.Device) error
+	SetupUNILogicalPorts(*voltha.Device) error
+	DisableAllChildDevices(cDevice *voltha.Device) error
+	DeleteLogicalDevice(cDevice *voltha.Device) error
+	DeleteLogicalPorts(cDevice *voltha.Device) error
+	DeleteAllChildDevices(cDevice *voltha.Device) error
+	RunPostDeviceDelete(cDevice *voltha.Device) error
 }
diff --git a/vendor/github.com/opencord/voltha-go/rw_core/utils/flow_utils.go b/vendor/github.com/opencord/voltha-go/rw_core/utils/flow_utils.go
index 0c485bb..c2c9287 100644
--- a/vendor/github.com/opencord/voltha-go/rw_core/utils/flow_utils.go
+++ b/vendor/github.com/opencord/voltha-go/rw_core/utils/flow_utils.go
@@ -171,9 +171,11 @@
 
 func (dr *DeviceRules) Copy() *DeviceRules {
 	copyDR := NewDeviceRules()
-	for key, val := range dr.Rules {
-		if val != nil {
-			copyDR.Rules[key] = val.Copy()
+	if dr != nil {
+		for key, val := range dr.Rules {
+			if val != nil {
+				copyDR.Rules[key] = val.Copy()
+			}
 		}
 	}
 	return copyDR