code: def delete_locks(context, network_ids, addresses):
      
      addresses_no_longer_null_routed = _find_addresses_to_be_unlocked(
          context, network_ids, addresses)
      LOG.info("Deleting %s lock holders on IPAddress with ids: %s",
               len(addresses_no_longer_null_routed),
               [addr.id for addr in addresses_no_longer_null_routed])
  
      for address in addresses_no_longer_null_routed:
          lock_holder = None
          try:
              lock_holder = db_api.lock_holder_find(
                  context, lock_id=address.lock_id, name=LOCK_NAME,
                  scope=db_api.ONE)
              if lock_holder:
                  db_api.lock_holder_delete(context, address, lock_holder)
          except Exception:
              LOG.exception("Failed to delete lock holder %s", lock_holder)
              continue
      context.session.flush()
docs: Deletes locks for each IP address that is no longer null-routed.