linux-kernel - Re: [PATCH 0/3] GPIO support for BRCMSTB

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Message-ID: <20150602162830.GI2067@n2100.arm.linux.org.uk>
Date:	Tue, 2 Jun 2015 17:28:31 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Gregory Fong <gregory.0xf0@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
	Brian Norris <computersforpeace@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 0/3] GPIO support for BRCMSTB

On Tue, Jun 02, 2015 at 11:05:21AM +0200, Linus Walleij wrote:
> ... and have the
> IRQ handler return IRQ_NONE if the IRQ comes from this
> bank, or IRQ_HANDLED if it has handled an IRQ from its own
> space.

I'm not sure that's worded correctly or not, but... fwiw, all IRQ handlers
_should_ be returning IRQ_NONE if the IRQ does not belong to them whether
or not they're shared handlers.

That is so the kernel can detect stuck IRQs and report that fact, rather
than just locking up silently.  ARM CPUs make no progress when the IRQ to
them is permanently asserted, so a stuck IRQ can be rather problematical.

-- 
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