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

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Message-ID: <20091102140925.GB6840@sirena.org.uk>
Date:	Mon, 2 Nov 2009 14:09:25 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Uwe Kleine-K?nig <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 02:58:27PM +0100, Uwe Kleine-K?nig wrote:
> On Mon, Nov 02, 2009 at 11:51:01AM +0000, Mark Brown wrote:

> > This might create issues with a request_nounmask() function, though a
> > request plus mask is probably enough - I guess you're using this for
> > your the RTC driver in which case a spurious periodic interrupt is
> > unlikely to be an issue.

> Yes, I use it to simplify things in the RTC driver a bit.  I register
> the 1HZ irq unconditionally and only track if it's masked or not.  This way
> I can save some case discrimination.

What I've done for wm8350 is just request the IRQ then immediately mask
it and not worry about a periodic notification coming in in the gap -
reporting the extra periodic notification is vanishingly unlikely to do
any harm in the case that the race does crop up.
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