B43legacy_IRQ_BEACON
dev->irq_mask &= ~B43legacy_IRQ_BEACON;
b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_REASON, B43legacy_IRQ_BEACON);
dev->irq_mask |= B43legacy_IRQ_BEACON;
if (reason & B43legacy_IRQ_BEACON)