devm_request_irq函数

devm_request_irq函数是Linux内核中的一个函数，用于请求并注册一个中断处理程序。它的函数原型如下：
int devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler, unsigned long irqflags, const char *devname, void *dev_id);

该函数与request_irq函数类似，但是使用了devm_前缀，表示该函数是通过设备模型管理的。dev参数是指向设备结构体的指针，irq参数是中断号，handler参数是中断处理函数，irqflags参数是中断标志，devname参数是设备名称，dev_id参数是设备标识。

通过调用devm_request_irq函数，可以方便地请求并注册一个中断处理程序，并且在设备释放时自动释放中断资源，避免了手动释放中断资源的繁琐过程。
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