MPS2_MAX_PORTS
if (co->index < 0 || co->index >= MPS2_MAX_PORTS)
.nr = MPS2_MAX_PORTS,
id = idr_alloc_cyclic(&ports_idr, (void *)mps_port, 0, MPS2_MAX_PORTS, GFP_KERNEL);
id = idr_alloc(&ports_idr, (void *)mps_port, id, MPS2_MAX_PORTS, GFP_KERNEL);