linux-kernel - Re: [patch 09/26] arm: mmp: Remove pointless fiddling with irq internals

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Message-ID: <20140223231755.GA27579@pengutronix.de>
Date:	Mon, 24 Feb 2014 00:17:55 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Peter Zijlstra <peterz@...radead.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Eric Miao <eric.y.miao@...il.com>, Ingo Molnar <mingo@...e.hu>,
	arm <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [patch 09/26] arm: mmp: Remove pointless fiddling with irq
 internals

Hi Thomas,

On Sun, Feb 23, 2014 at 09:40:13PM -0000, Thomas Gleixner wrote:
> The pm-mmp2 and pm-pxa910 power management related irq_set_wake
> callbacks fiddle pointlessly with the irq actions for no reason except
> for lack of understanding how the wakeup mechanism works.
> 
> On supsend the core disables all interrupts lazily, i.e. it does not
> mask them at the irq controller level. So any interrupt which is
> firing during supsend will mark the corresponding interrupt line as
s/supsend/suspend/ twice
> pending. Just before the core powers down it checks whether there are
> interrupts pending from interrupt lines which are marked as wakeup
> sources and if so it aborts the resume and resends the interrupts.
It's the suspend that is aborted, not the resume.

Other than that your change looks fine.

Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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