usb驱动 使中断服务程序停止

[leiyun121]

安装usb的host驱动时，程序停在handle_IRQ_event中。
请大虾帮忙看下，真的是找不到原因：

irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
{
	irqreturn_t ret, retval = IRQ_NONE;
	unsigned int status = 0;
	printk("handle_IRQ_event--->1\n");
	if (!(action->flags & IRQF_DISABLED))
	{
		printk("handle_IRQ_event-->local_irq_enable-->1\n");
		local_irq_enable_in_hardirq();    //程序停在这里
		//local_irq_enable();            //如果把上面那句换掉，程序会停在这里
		printk("handle_IRQ_event--->local_irq_enable-->2\n");
	}
	do {
		trace_irq_handler_entry(irq, action);
		ret = action->handler(irq, action->dev_id);
		trace_irq_handler_exit(irq, action, ret);
		printk("handle_IRQ_event-->irqnum=%d\n", irq);
		switch (ret) {
		case IRQ_WAKE_THREAD:
			/*
			 * Set result to handled so the spurious check
			 * does not trigger.
			 */
			ret = IRQ_HANDLED;
			printk("handle_IRQ_event-->ret=IRQ_WAKE_THREAD\n");
			/*
			 * Catch drivers which return WAKE_THREAD but
			 * did not set up a thread function
			 */
			if (unlikely(!action->thread_fn)) {
				warn_no_thread(irq, action);
				break;
			}

			/*
			 * Wake up the handler thread for this
			 * action. In case the thread crashed and was
			 * killed we just pretend that we handled the
			 * interrupt. The hardirq handler above has
			 * disabled the device interrupt, so no irq
			 * storm is lurking.
			 */
			if (likely(!test_bit(IRQTF_DIED,
					     &action->thread_flags))) {
				set_bit(IRQTF_RUNTHREAD, &action->thread_flags);
				printk("handle_IRQ_event-->set_bit\n");
				wake_up_process(action->thread);
			}

			/* Fall through to add to randomness */
		case IRQ_HANDLED:
			status |= action->flags;
			break;

		default:
			break;
		}

		retval |= ret;
		action = action->next;
	} while (action);

	if (status & IRQF_SAMPLE_RANDOM)
		add_interrupt_randomness(irq);
	local_irq_disable();

	return retval;
}

[asmlearn]

具体停在哪里，是死循环吗

[leiyun121]

问题发现了，使用了两个enabel_irq().所以不动了！