linux-kernel - Re: [PATCH 1/1] Input: ab8500-ponkey: Make the distinction between DT and non-DT boots

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Date:	Tue, 7 Aug 2012 18:01:30 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linus.walleij@...ricsson.com, arnd@...db.de,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	STEricsson_nomadik_linux@...t.st.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/1] Input: ab8500-ponkey: Make the distinction between
 DT and non-DT boots

On Mon, Aug 06, 2012 at 05:02:26PM +0100, Mark Brown wrote:
> On Mon, Aug 06, 2012 at 04:37:52PM +0100, Lee Jones wrote:
> > On Mon, Aug 06, 2012 at 01:19:15AM -0700, Dmitry Torokhov wrote:
> 
> > > > +	ponkey->irq_dbf = (np) ? ab8500_irq_get_virq(ab8500, irq_dbf) : irq_dbf;
> > > > +	ponkey->irq_dbr = (np) ? ab8500_irq_get_virq(ab8500, irq_dbr) : irq_dbr;
> 
> > > Why this isn't done inside ab8500_irq_get_virq()?
> 
> > There's no reason why it can't be.
> 
> > My first version of the patch did just that in fact.
> 
> > Would that be your preference?
> 
> Restating my comment elsewhere...  why do we even need to do this in
> _get_virq() - I'd *really* expect this to be handled by the irq domain
> code.

Okay, so I've just spent a small amount of time looking at this. I think
the best place for this would be in *_get_virq(), using the same logic that
selected a *_legacy or *_linear domain in the first place. The only thing 
the domain can test for is the 'type' of domain and the requested IRQ. This
is where the issue lies. If a hwirq to virq conversion is requested, but a
virq is passed (which happens in the non-DT case) a WARN() is triggered
because the irq passed is bigger than first_irq + size. I think *_get_virq()
should ensure that only a hwirq is passed to irq_create_mapping().

Let me know if you had other ideas.

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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