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From: David Miller <davem@davemloft.net>
Subject: Re: mlx4 netpoll and rx/tx weirdness
Date: Mon, 17 Mar 2014 17:22:30 -0400 (EDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Sun, 16 Mar 2014 09:17:01 -0700

> Wait a minute, I thought ndo_poll_controller() had to be synchronous,
> not schedule a napi ?

ndo_poll_controller() basically runs the hardware interrupt handler,
which might schedule NAPI processing.  Then netpoll invokes
the NAPI poll in whatever state ndo_poll_controller() left it in.