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

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Date:	Mon, 19 Dec 2011 08:23:42 -0600
From:	Rob Herring <robherring2@...il.com>
To:	"Cousson, Benoit" <b-cousson@...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

Benoit,

On 12/19/2011 06:41 AM, Cousson, Benoit wrote:
> 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))

I think this should work:

if (d->nr_irq && ((intspec[0] < d->hwirq_base) ||
    (intspec[0] >= d->hwirq_base + d->nr_irq)))

Rob

>> +        return -EINVAL;
>>
>>       *out_hwirq = intspec[0];
>>       *out_type = IRQ_TYPE_NONE;
> 

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