IRQ_PEND_RESTART
case IRQ_PEND_RESTART:
set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
return test_bit(IRQ_PEND_RESTART, &li->pending_irqs);
case IRQ_PEND_RESTART:
clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);