linux-kernel - Re: [PATCH] clk: Fix race conditions between clk_set_parent() and clk

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Message-ID: <20120515200040.GP30400@pengutronix.de>
Date:	Tue, 15 May 2012 22:00:40 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Saravana Kannan <skannan@...eaurora.org>
Cc:	Mike Turquette <mturquette@...aro.org>,
	Arnd Bergman <arnd.bergmann@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
	Rob Herring <rob.herring@...xeda.com>,
	Russell King <linux@....linux.org.uk>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Walmsley <paul@...an.com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Jamie Iles <jamie@...ieiles.com>,
	Richard Zhao <richard.zhao@...aro.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Deepak Saxena <dsaxena@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH] clk: Fix race conditions between clk_set_parent() and
 clk_enable()

On Tue, May 15, 2012 at 12:51:06PM -0700, Saravana Kannan wrote:
> >>  	ret = clk->ops->set_parent(clk->hw, i);
> >
> >You call ->set_parent while holding a spinlock. This won't work with i2c
> >clocks.
> 
> I did account for that. I explained it in the commit text. Please
> let me know if any part of that is not clear or is not correct.
>

I missed this part in the commit log. I have no idea whether we can live
with this limitation though.

Sascha

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