linux-kernel - Re: Locking in the clk API

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Message-ID: <20110111143406.GC22390@atrey.karlin.mff.cuni.cz>
Date:	Tue, 11 Jan 2011 15:34:06 +0100
From:	Pavel Machek <pavel@....cz>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Sascha Hauer <s.hauer@...gutronix.de>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	linux-sh@...r.kernel.org,
	Ben Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, Paul Mundt <lethal@...ux-sh.org>,
	Uwe Kleine-K??nig <u.kleine-koenig@...gutronix.de>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Locking in the clk API

Hi!

> Another solution occurs to me: clk_enable() which returns -EAGAIN if
> it's called in an atomic context but needs to sleep, and let the driver
> deal with the clock not being enabled when it wants it.  The down side
> is it requires the driver to have additional code to sort out such a
> problem.

I do not think that "atomic context" is possible to reliably detect
inside a function like that.
									Pavel
-- 
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