IPW_INTERRUPT_MASK
write_register(priv->net_dev, IPW_REG_INTA_MASK, IPW_INTERRUPT_MASK);
inta &= IPW_INTERRUPT_MASK;
(unsigned long)inta & IPW_INTERRUPT_MASK);
(unsigned long)inta & IPW_INTERRUPT_MASK);
inta &= IPW_INTERRUPT_MASK;