AQ_INTR_STATUS_REG
status = AQ_READ_REG(sc, AQ_INTR_STATUS_REG);
status = AQ_READ_REG(sc, AQ_INTR_STATUS_REG);
AQ_WRITE_REG(sc, AQ_INTR_STATUS_REG, (1 << sc->sc_linkstat_irq));
status = AQ_READ_REG(sc, AQ_INTR_STATUS_REG);