linux-kernel - Re: 2.6.23-rc2-mm1: irq lock inversion dependency detected

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Message-ID: <20070824082725.GA2203@ff.dom.local>
Date:	Fri, 24 Aug 2007 10:27:25 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	Mariusz Kozlowski <m.kozlowski@...land.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.23-rc2-mm1: irq lock inversion dependency detected

On 10-08-2007 09:06, Mariusz Kozlowski wrote:
> Hello,
> 
> 	And the winner of today is ...
> 
> 
> 
> =========================================================
> [ INFO: possible irq lock inversion dependency detected ]
> 2.6.23-rc2-mm1 #7
> ---------------------------------------------------------
> runscript.sh/5843 just changed the state of lock:
>  (_xmit_ETHER){-+..}, at: [<c03cbe79>] dev_watchdog+0x17/0xcc
> but this lock took another, soft-irq-unsafe lock in the past:
>  (&tp->lock){--..}
> 
> and interrupts could create inverse lock ordering between them.
...
> Really no idea who to CC here ;)

IMHO, this should be fixed by last changes to free_irq & request_irq.
(Seems to be possible only with CONFIG_DEBUG_SHIRQ?) Otherwise I can
be CC-ed - my pleasure!

Cheers,
Jarek P.
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