> That won't work in this case. It's also the wrong thing to do. If the link
> is down you want packets to flow out of the device into oblivion.
You are right here. They will stay in the queue.
Well, you may add to my diagram one more step:
- it purges device queues: qdisc_reset(dev->qdisc);
> Also for some protocols its only by throwing packets down the pipe
> you find out. Finally the sync protocols generate their own frames like keepalive for
> the link state so setting dev->tbusy means it will never come back
It will be awaken by watchdog. And not with data rate, but with
watchdog rate ~5sec.
Alexey
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