linux-kernel - Re: [PATCH 2/9] irq: check domain hwirq range for DT translate

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Date:	Mon, 19 Dec 2011 13:41:52 +0100
From:	"Cousson, Benoit" <b-cousson@...com>
To:	Rob Herring <robherring2@...il.com>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree-discuss@...ts.ozlabs.org>,
	Kevin Hilman <khilman@...com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Tony Lindgren <tony@...mide.com>,
	Linus Walleij <linus.ml.walleij@...il.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Barry Song <baohua.song@....com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/9] irq: check domain hwirq range for DT translate

Hi Rob,

While trying your series to take advantage of the generic-irq domain 
support for OMAP3 INTC, I realized that the following patch is breaking 
drivers that are using irq_domain_add_simple.

The point is that irq_domain_add_simple does not populate hwirq_base or 
nr_irq, so that test will always fail if the domain is created by the 
irq_domain_add_simple API.

Adding an extra parameter to provide the nr_irq should fix that.

The long term fix should be to use the generic-irq for such driver, but 
this is not the same effort, so it might worth fixing that API for the 
moment.

Regards,
Benoit

On 12/14/2011 4:28 PM, Rob Herring wrote:
> From: Rob Herring<rob.herring@...xeda.com>
>
> A DT node may have more than 1 domain associated with it, so make sure
> the hwirq number is within range when doing DT translation.
>
> Signed-off-by: Rob Herring<rob.herring@...xeda.com>
> Cc: Thomas Gleixner<tglx@...utronix.de>
> ---
>   kernel/irq/irqdomain.c |    3 +++
>   1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index 200ce83..ae6441e 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -135,6 +135,9 @@ int irq_domain_simple_dt_translate(struct irq_domain *d,
>   		return -EINVAL;
>   	if (intsize<  1)
>   		return -EINVAL;
> +	if ((intspec[0]<  d->hwirq_base) ||
> +	    (intspec[0]>= d->hwirq_base + d->nr_irq))
> +		return -EINVAL;
>
>   	*out_hwirq = intspec[0];
>   	*out_type = IRQ_TYPE_NONE;

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