linux3.0.1 外部中断组1~9，驱动中request失败

writel( readl(S3C64XX_GPPCON)&(~(0x3 << 1) ) | (0x3<<1), S3C64XX_GPPCON);
request_irq( IRQ_EINT_GROUP(8, 1), ir_interrupt, 0, "mydev", NULL);

需在GPP1上外接一个红外，以上返回EINVAL

查看 request_threaded_irq 源码：

        if ((irqflags & IRQF_SHARED) && !dev_id)
                return -EINVAL;
        desc = irq_to_desc(irq);
        if (!desc)
                return -EINVAL;
        if (!irq_settings_can_request(desc))
                return -EINVAL;
        if (!handler) {
                if (!thread_fn)
                        return -EINVAL;
                handler = irq_default_primary_handler;
        }
      
不知道怎么回事，0组中断申请没有问题

现调试到是irq_settings_can_request不能通过