linux 按键中断，中断申请奇怪问题

菜鸟地等待 · 发表于 2020-11-16 09:19:59

本帖最后由菜鸟地等待于 2020-11-16 09:21 编辑

求教大神我在使用ret = request_irq(s3c2440irq.irqkey.irqnum,keyirq_fun,IRQF_TRIGGER_RISING,"gpio_key",NULL);在加载驱动时候会出现内核指针指向错误如Unable to handle kernel NULL pointer dereference at virtual addr各位有有没有遇到类似问题，
中断函数
static irqreturn_t keyirq_fun(int irq, void *dev_id)
{
//struct s3c2440irq_dev *dev = dev_id;

printk("key press down");

return IRQ_RETVAL(IRQ_HANDLED);;
}
获取中断号函数

s3c2440irq.irqkey.irqnum = gpio_to_irq(s3c2440irq.irqkey.keyirq_gpio);