现在的中断处理函数的返回代码是一个 irqreturn_t 类型。
The interrupt handler function now has a return code of type irqreturn_t.
本章详细介绍了与网络设备驱动程序相关的数据结构和中断处理函数。
This paper introduces in detail the data structure and ISR, which relates to the network device driver program.
这样特性用在很多中断处理函数，因为它容许串行地处理同一类型的IRQ。
This feature is used by most interrupt handlers, because it allows them to process IRQs of the same type serially.
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