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

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Date:	Wed, 14 Dec 2011 16:14:53 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Linus Walleij <linus.walleij@...ricsson.com>
CC:	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

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.

Rob

> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---
>  include/linux/irqdomain.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
> index 99834e58..78a1e66 100644
> --- a/include/linux/irqdomain.h
> +++ b/include/linux/irqdomain.h
> @@ -74,7 +74,7 @@ struct irq_domain {
>  static inline unsigned int irq_domain_to_irq(struct irq_domain *d,
>  					     unsigned long hwirq)
>  {
> -	if (d->ops->to_irq)
> +	if (d->ops && d->ops->to_irq)
>  		return d->ops->to_irq(d, hwirq);
>  	if (WARN_ON(hwirq < d->hwirq_base))
>  		return 0;
--
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