netdev - Re: lockdep trace from rc2.

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Message-Id: <20080226.181354.33497295.davem@davemloft.net>
Date:	Tue, 26 Feb 2008 18:13:54 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	davej@...emonkey.org.uk
Cc:	netdev@...r.kernel.org
Subject: Re: lockdep trace from rc2.

From: Dave Jones <davej@...emonkey.org.uk>
Date: Sun, 24 Feb 2008 21:22:37 -0500

> https://bugzilla.redhat.com/show_bug.cgi?id=431038 has some more info,
> but the trace is below...
> I'll get an rc3 kernel built and ask the user to retest, but in case this
> isn't a known problem, I'm forwarding this here.

So basically, tulip's ->stop() calls tulip_down() which does a
flush_scheduled_work().

Lockdep is saying that the RTNL mutex (which is held when we
call the driver's ->stop() method) conflicts with that work
queue lock that flush_scheduled_work() takes.

Maybe this has something to do with how linkwatch works, but
I can't say that I've seen this before nor do I quite understand
what lockdep doesn't exactly like here.
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