中断的注册
request_irq 有这样几个参数:
static inline int __must_check
request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
const char *name, void *dev)
{
return request_threaded_irq(irq, handler, NULL, flags, name, dev);
}
中断处理函数被注册到哪里去呢?让我们沿着 request_irq 看下去。request_irq 调用的是 request_threaded_irq。代码如下: