linux-kernel - Re: lockdep and threaded IRQs (was: ...)

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Message-ID: <alpine.LFD.2.00.0902282209450.29264@localhost.localdomain>
Date:	Sat, 28 Feb 2009 22:13:37 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	David Brownell <david-b@...bell.net>
cc:	Andrew Morton <akpm@...ux-foundation.org>, me@...ipebalbi.com,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	felipe.balbi@...ia.com, dmitry.torokhov@...il.com,
	sameo@...nedhand.com, a.p.zijlstra@...llo.nl
Subject: Re: lockdep and threaded IRQs (was: ...)

On Sat, 28 Feb 2009, Thomas Gleixner wrote:

> On Sat, 28 Feb 2009, David Brownell wrote:
> > Got a version that applies to mainline GIT?
> 
> http://tglx.de/~tglx/patches.tar.bz2 
>  
> > At a quick glance it looks like these patches don't cover
> > set_irq_chained_handler(), which would be trouble since
> > __setup_irq() doesn't get called in those cases.
> 
> Hmm, I did not think about chained handlers where the demux handler
> needs to run in a thread as well. Usually demux handlers just have a
> fast path kicking the particular real handlers.

I looked at the code in twl4030-irq.c and I don't think that the demux
handler needs to be setup as a chained handler at all.

Just register it as a standard handler and let it wakeup the other irq
threads or is there a particular requirement that the demuxed handlers
need to run in the same thread context as the demux handler itself ?

Thanks,

	tglx
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