From mboxrd@z Thu Jan  1 00:00:00 1970
From: benh@kernel.crashing.org (Benjamin Herrenschmidt)
Date: Tue, 03 Apr 2012 08:33:25 +1000
Subject: [PATCH v5 06/27] irq_domain/powerpc: eliminate irq_map; use
 irq_alloc_desc() instead
In-Reply-To: <20120402215524.GM24211@n2100.arm.linux.org.uk>
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To: linux-arm-kernel@lists.infradead.org
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On Mon, 2012-04-02 at 22:55 +0100, Russell King - ARM Linux wrote:
> Well, presumably someone is calling irq_set_irq_type() asking explicitly
> for IRQ_TYPE_NONE.  The code will now (as it always used to before David's
> change) do exactly what you ask this to: it will ask the type to be set
> to none.
> 
> If you don't want to set the type to none, don't call the interface asking
> for that to happen. 

I think part of the idea with NONE is to use it as "reset that interrupt
to the "default" setting, whatever that means ...

Cheers,
Ben.