函数br_device_event中

        /* Events that may cause spanning tree to refresh */
        if (!notified && (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
                          event == NETDEV_CHANGE || event == NETDEV_DOWN))
                br_ifinfo_notify(RTM_NEWLINK, NULL, p);


这里
对于NETDEV_DOWN
为什么不是

br_ifinfo_notify(RTM_DELLINK, NULL, p);


设备down掉，连接断开，不是很合理？
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