From: Andi Kleen <[email protected]>
Date: Fri, 20 Oct 2006 23:01:29 +0200
> netpoll always played a little fast'n'lose with various locking rules.
The current code is fine, it never reenters ->poll, because it
maintains a "->poll_owner" which it checks in netpoll_send_skb()
before trying to call back into ->poll.
Every call to ->poll first sets ->poll_owner to the current cpu id.
netpoll_send_skb() aborts and does a drop if ->poll_owner is set to
the current smp_processor_id().
I sometimes feel like I'm the only person actually reading the sources
and past threads on this topic before replying.
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