failover_get_bymac
failover_dev = failover_get_bymac(slave_dev->perm_addr, &fops);
failover_dev = failover_get_bymac(slave_dev->perm_addr, &fops);
failover_dev = failover_get_bymac(slave_dev->perm_addr, &fops);
failover_dev = failover_get_bymac(slave_dev->perm_addr, &fops);