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唤醒任务队列处理消息

static DECLARE_DELAYED_WORK(linkwatch_work, linkwatch_event);=>void linkwatch_event(struct work_struct *dummy)	rtnl_lock();	__linkwatch_run_queue(time_after(linkwatch_nextevent, jiffies));	=>void __linkwatch_run_queue(int urgent_only)		list_splice_init(&lweventlist, &wrk);		while (!list_empty(&wrk))			dev = list_first_entry(&wrk, struct net_device, link_watch_list);			list_del_init(&dev->link_watch_list);			if (urgent_only && !linkwatch_urgent_event(dev)) {				list_add_tail(&dev->link_watch_list, &lweventlist);				continue;			}			linkwatch_do_dev(dev);				if (!list_empty(&lweventlist))			linkwatch_schedule_work(0);				rtnl_unlock();

状态变化添加消息

void netif_carrier_on(struct net_device *dev)	linkwatch_fire_event(dev);	=>void linkwatch_fire_event(struct net_device *dev)		bool urgent = linkwatch_urgent_event(dev);		linkwatch_add_event(dev);		=>void linkwatch_add_event(struct net_device *dev)			if (list_empty(&dev->link_watch_list)) 				list_add_tail(&dev->link_watch_list, &lweventlist);				dev_hold(dev);		linkwatch_schedule_work(urgent);	if (netif_running(dev))		__netdev_watchdog_up(dev);

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