From: Eric Dumazet <redacted>
Date: Mon, 10 Mar 2014 22:02:38 -0700

It seems netpoll should not drain rx queues.

There are netpoll users (admittedly, out of tree) that make use of
packet receive.

kdump is one.

That's what all of the __netpoll_rx() et al. stuff is for.

Therefore we'll probably just have to enforce that if a netpoll
user wants RX packets, he has to invoke netpoll from a reasonable
context.

But if we're called from hardware interrupts, yes we block RX
processing.