RING_FLAG_NO_SUSPEND
ctl->tx = tb_ring_alloc_tx(nhi, 0, 10, RING_FLAG_NO_SUSPEND);
ctl->rx = tb_ring_alloc_rx(nhi, 0, 10, RING_FLAG_NO_SUSPEND, 0, 0xffff,
if (nhi->ops->request_ring_irq(ring, flags & RING_FLAG_NO_SUSPEND))