netdev - Re: Lockdep splat for rt8169

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Message-ID: <20110507181558.GA20456@electric-eye.fr.zoreil.com>
Date:	Sat, 7 May 2011 20:15:58 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Ben Greear <greearb@...delatech.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: Lockdep splat for rt8169

Ben Greear <greearb@...delatech.com> :
[...]
> Seems to be the first post 2.6.38 kernel that will boot stable
> on this system!

You are spoiled. I have to merge davem-next with -git or my raid1
test machine is unusable. :o/

> I previously reported the timer issue, but perhaps the lock
> debugging will help.

It is the same problem and will be triggered by any driver changing
the link state from an hard irq context - the r8169 driver is not
alone.

If you want a q'n'd workaround for the r8169 driver, defering its
LinkChg processing from the irq handler to a work task may do the
trick.

I am not sure what the general fix is:
- do more or less the same for linkwatch (i.e. defer more work to
  a user context)
- audit each driver
- ???

-- 
Ueimor
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