linux-kernel - Re: [PATCH] irq: fix crash due to op-less irq domains

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Date:	Wed, 14 Dec 2011 22:22:33 +0000
From:	Jamie Iles <jamie@...ieiles.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Jamie Iles <jamie@...ieiles.com>,
	Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH] irq: fix crash due to op-less irq domains

On Wed, Dec 14, 2011 at 04:14:53PM -0600, Rob Herring wrote:
> Linus,
> 
> On 12/14/2011 02:55 PM, Linus Walleij wrote:
> > From: Linus Walleij <linus.walleij@...aro.org>
> > 
> > IRQ domains without ops does not work anymore after commit
> > "irq: support domains with non-zero hwirq base", since the
> > check dereferences domain->ops->to_irq without checking of
> > domain->ops are NULL. This makes U300 (and probably most other
> > systems using the PL190 VIC) boot again.
> 
> I thought the VIC series had the fix for this, but it seems not. NULL
> ops is considered invalid based on the code comments. The correct fix is
> this patch:
> 
> irqdomain: export irq_domain_simple_ops for !CONFIG_OF
> http://www.spinics.net/lists/arm-kernel/msg150290.html
> 
> I believe this is going in with some iMX changes. But I guess the VIC is
> going to need a fix to use irq_domain_simple_ops.

Yes, Thomas has acked that patch, but it wasn't clear who was going to 
merge it.  I asked if this could go through Russell along with a patch 
to make the VIC driver use it but haven't heard anything back yet.  I'll 
repost them now.

Jamie
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