linux-kernel - Re: Locking in the clk API

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Message-ID: <20110115150331.GB6917@pengutronix.de>
Date:	Sat, 15 Jan 2011 16:03:31 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Christer Weinigel <christer@...nigel.se>,
	Saravana Kannan <skannan@...eaurora.org>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	linux-sh@...r.kernel.org,
	Ben Herrenschmidt <benh@...nel.crashing.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: Locking in the clk API

Hi Russell,

On Sat, Jan 15, 2011 at 02:53:58PM +0000, Russell King - ARM Linux wrote:
> We've been around returning EAGAIN, WARN_ONs, BUG_ONs, having clk_enable()
> vs clk_enable_atomic(), clk_enable_cansleep() vs clk_enable(), etc.
> 
> There's been a lot of talk on this issue for ages with no real progress
> that I'm just going to repeat: let's unify those implementations which
> use a spinlock for their clks into one consolidated solution, and
> a separate consolidated solution for those which use a mutex.
> 
> This will at least allow us to have _some_ consolidation of the existing
> implementations - and it doesn't add anything to the problem at hand.
> It might actually help identify what can be done at code level to resolve
> this issue.
Great, so how should we do it?  Take Jeremy's patch and make the
differenciation between sleeping and atomic implementation a Kconfig
variable?

Best regards
Uwe

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