netdev - netpoll again ? (was: Re: 2.6.20-git14 rtl8139 possible circular locking dependency detected)

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Date:	Sat, 17 Feb 2007 23:57:46 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: netpoll again ? (was: Re: 2.6.20-git14 rtl8139 possible circular locking dependency detected)

Francois Romieu <romieu@...zoreil.com> :
> Michal Piotrowski <michal.k.k.piotrowski@...il.com> :
> [...]
> 
> Did you enable RTL8139_DEBUG ?
> 
> If so you can try the patch below.

It's buggy there too but you are not experiencing this one.

1 - netpoll() calls the poll() handler of the device through netpoll_poll()
2 - The poll handler of the device tries to acquire dev->_xmit_lock
    through dev_mc_add during the Rx protocol processing
3 - netpoll() holds dev->_xmit_lock to avoid recursion in netpoll_poll()

#2 and #3 have opposite requirements.

-- 
Ueimor
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