Added back-pipe for role assertion issues.
diff --git a/core/api/src/main/java/org/onlab/onos/net/device/DeviceProviderService.java b/core/api/src/main/java/org/onlab/onos/net/device/DeviceProviderService.java
index 5401646..7f28374 100644
--- a/core/api/src/main/java/org/onlab/onos/net/device/DeviceProviderService.java
+++ b/core/api/src/main/java/org/onlab/onos/net/device/DeviceProviderService.java
@@ -1,6 +1,7 @@
package org.onlab.onos.net.device;
import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.MastershipRole;
import org.onlab.onos.net.provider.ProviderService;
import java.util.List;
@@ -45,4 +46,13 @@
*/
void portStatusChanged(DeviceId deviceId, PortDescription portDescription);
+ /**
+ * Notifies the core about the providers inability to assert the specified
+ * mastership role on the device.
+ *
+ * @param deviceId identity of the device
+ * @param role mastership role being asserted
+ */
+ void unableToAssertRole(DeviceId deviceId, MastershipRole role);
+
}