如果一个中断请求不断到来而且没有注册那个设备的处理程序(例如，所有的驱动程序都返回IRQ_NONE)，内核就会忽略来自那个设备的中断。

If an interrupt keeps coming in and there is no registered handler for that device (for instance, all drivers return IRQ_NONE), then the kernel can block interrupts from that device.

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如果任务生吞中断请求，则worker线程将不知道有一个被请求的中断，从而耽误应用程序或服务的关闭。

If the task were to swallow the interrupt request, the worker thread might not learn that an interrupt was requested, which could delay the application or service shutdown.

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在换句话说，一个FIQ仅仅是一个更高优先级的中断请求时，由请求服务期间禁用IRQ和其他FIQ处理程序的优先级。

In other words, an FIQ is just a higher priority interrupt request, that is prioritized by disabling IRQ and other FIQ handlers during request servicing.

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