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

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Date:	Fri, 24 Aug 2007 10:50:18 +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 Fri, Aug 24, 2007 at 10:27:25AM +0200, Jarek Poplawski wrote:
> On 10-08-2007 09:06, Mariusz Kozlowski wrote:
...
> > =========================================================
> > [ 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!

OOPS! But, since it's about inversion - not state - there should be no
connection... Anyway if this returns currently (and if _SHIRQ only) I'm
interested.

Jarek P.
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