linux-kernel - Re: [RFC/PATCH 0/3] CLK: add more devm

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Message-ID: <20121120095321.GA11732@core.coreip.homeip.net>
Date:	Tue, 20 Nov 2012 01:53:21 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Mike Turquette <mturquette@...com>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [RFC/PATCH 0/3] CLK: add more devm_* APIs

On Tue, Nov 20, 2012 at 09:34:45AM +0000, Russell King - ARM Linux wrote:
> On Tue, Nov 20, 2012 at 01:22:16AM -0800, Dmitry Torokhov wrote:
> > Hi,
> > 
> > When looking at recent driver conversions to managed resources (devm_*) there
> > is no devm_clk_prepare() and similar functions, which forces mixing of 2
> > resource management styles (managed/classic) in the same driver, which is not
> > great.
> > 
> > This patch series adds more devm_* managed APIs to the CLK subsystem so that
> > driver conversions can be "pure".
> 
> So, how do you ensure the correct ordering between clk_unprepare() and
> clk_put(), or even clk_disable() and clk_unprepare() ?  I see nothing
> here which makes any guarantees as to the ordering of those operations
> upon cleanup.

devm_* calls form a stack so if you have

static void xxx_probe()
{
	input = devm_input_allocate_device();

	devm_request_irq();
	...
	devm_clk_prepare()
	...
	devm_clk_enable()
	... 
	input_register_device();
	return 0;
}

and

static int xxx_remove()
{
	return 0;
}

then upon remove we'll execute:

	input_unregister_device();
	devm_clk_disable();
	devm_clk_unprepare();
	devm_free_irq();
	input_free_device();

Thanks.

-- 
Dmitry
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