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Date: Mon, 17 Aug 2009 13:03:53 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Michael Buesch <mb@bu3sch.de>
cc: linux-kernel@vger.kernel.org
Subject: Re: Threaded interrupt handlers broken?
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References: <200908161153.14081.mb@bu3sch.de> <200908162301.21775.mb@bu3sch.de> <alpine.LFD.2.00.0908162316150.2782@localhost.localdomain> <200908171223.57412.mb@bu3sch.de> <alpine.LFD.2.00.0908171255570.2782@localhost.localdomain>
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On Mon, 17 Aug 2009, Thomas Gleixner wrote:

> On Mon, 17 Aug 2009, Michael Buesch wrote:
> > Ok, I added some more debugging code:
> > http://bu3sch.de/patches/wireless-testing/20090817-1219/patches/001-hack-threaded-irqs.patch
> > 
> > Here's the result:
> > http://bu3sch.de/misc/dmesg2
> >
> > Is it possible that the irq_to_desc() in irq_thread() fails and the
> > resulting desc pointer points to something random? That could
> > probably explain why the bit is set and why the spinlock is
> > uninitialized. But it would not explain why desc->lock would still
> > work... Maybe irq_to_desc() returns a descriptor to another irq (!=
> > 52)?
> 
> That would cause the whole irq code to fail. Can you send/upload your
> .config please ?

Also just add printk("desc: %p \n", desc); to the various places to
make sure that your pointers are correct.

Thanks,

	tglx