linux-kernel - Re: Locking in the clk API

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Message-ID: <20110121093218.GB13235@n2100.arm.linux.org.uk>
Date:	Fri, 21 Jan 2011 09:32:18 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Saravana Kannan <skannan@...eaurora.org>
Cc:	Dima Zavin <dmitriyz@...gle.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	linux-sh@...r.kernel.org,
	Ben Herrenschmidt <benh@...nel.crashing.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	linux-kernel@...r.kernel.org, Paul Mundt <lethal@...ux-sh.org>,
	Ben Dooks <ben-linux@...ff.org>,
	Uwe Kleine-K??nig <u.kleine-koenig@...gutronix.de>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Locking in the clk API

On Thu, Jan 20, 2011 at 08:12:45PM -0800, Saravana Kannan wrote:
> In my opinion, the only major reason for needing atomic clk APIs was due  
> to device_ops->suspend being atomic. Since that's not the case anymore,  
> I really don't see a justification for atomic clocks. Sure, I might have  
> missed some exceptions, but in that case we should make the atomic APIs  
> an exception (add clk_enable_atomic) and not the norm.

The suspend method has never been atomic.  It has always been able to
sleep.  You're mistaken.
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