linux-kernel - Re: [PATCH] fix return value of i8042_aux_test

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Date:	Thu, 26 Jul 2007 16:29:13 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	fernando@....ntt.co.jp
Cc:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>,
	Fernando Luis VÃ¡zquez Cao 
	<fernando@....ntt.co.jp>, linux-kernel@...r.kernel.org,
	vojtech@...e.cz, akpm@...ux-foundation.org
Subject: Re: [PATCH] fix return value of i8042_aux_test_irq

> > A small number of boxes do share IRQ12 and it was switched to shared for
> > them.
> If that is the case interrupt handlers should be able to determine whether
> a certain interrupt comes from their respective devices, and return
> IRQ_HANDLED or IRQ_NONE accordingly. Returning IRQ_HANDLED unconditionally
> when IRQF_SHARED is set seems strange. Is this behavior intended?

Sometimes you simple can't tell and in those cases you have no choice.

Alan
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