linux-kernel - Re: [PATCH] mfd/mc13783: near complete rewrite

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Message-ID: <20091102151242.GA26170@rakim.wolfsonmicro.main>
Date:	Mon, 2 Nov 2009 15:12:42 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH] mfd/mc13783: near complete rewrite

On Mon, Nov 02, 2009 at 03:32:29PM +0100, Uwe Kleine-König wrote:

> On mc13783 the 1HZ irq triggers immediately after unmasking provided
> that it has power for more than 1s.  Because of locking the irq isn't
> recognized as 1HZ as the irqhandler tries to take the lock that the rtc
> probe function is holding and only releasing after the irq is masked.
> So for me it's just a spurious irq.

Hrm, I can't see that in the RTC driver code?  I'd have expected that if
there is a lock it'd ensure that the handler is in place before the
interrupt is unmasked.

Looking at the IRQ handler I do notice that you require all the handlers
to explicitly ack their interrupts - are there circumstances where a
handler wouldn't want to do the ack?  If there aren't it'd seem like
it'd save work to have the core driver do the acks.
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