linux-kernel - Re: [PATCH v3 3/5] clk: Add common __clk_get(), __clk

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Message-ID: <5218CE5B.1020906@gmail.com>
Date:	Sat, 24 Aug 2013 17:16:43 +0200
From:	Sylwester Nawrocki <sylvester.nawrocki@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	linux-arm-kernel@...ts.infradead.org, mturquette@...aro.org,
	jiada_wang@...tor.com, broonie@...nel.org, vapier@...too.org,
	ralf@...ux-mips.org, kyungmin.park@...sung.com,
	myungjoo.ham@...sung.com, shawn.guo@...aro.org,
	sebastian.hesselbarth@...il.com, LW@...O-electronics.de,
	t.figa@...sung.com, g.liakhovetski@....de,
	laurent.pinchart@...asonboard.com, linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org, linux-mips@...ux-mips.org,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH v3 3/5] clk: Add common __clk_get(), __clk_put() implementations

On 08/24/2013 01:13 AM, Russell King - ARM Linux wrote:
> On Fri, Aug 23, 2013 at 05:03:45PM +0200, Sylwester Nawrocki wrote:
>> >  This patch adds common __clk_get(), __clk_put() clkdev helpers which
>> >  replace their platform specific counterparts when the common clock
>> >  API is enabled.
>> >
>> >  The owner module pointer field is added to struct clk so a reference
>> >  to the clock supplier module can be taken by the clock consumers.
>> >
>> >  Signed-off-by: Sylwester Nawrocki<s.nawrocki@...sung.com>
>> >  Signed-off-by: Kyungmin Park<kyungmin.park@...sung.com>
>
> I'm mostly happy with this now.
>
>> >  +int __clk_get(struct clk *clk)
>> >  +{
>> >  +	if (clk&&  !try_module_get(clk->owner))
>> >  +		return 0;
>> >  +
>> >  +	return 1;
>> >  +}
>> >  +EXPORT_SYMBOL(__clk_get);
>> >  +
>> >  +void __clk_put(struct clk *clk)
>> >  +{
>> >  +	if (WARN_ON_ONCE(IS_ERR(clk)))
>> >  +		return;
>> >  +
>> >  +	if (clk)
>> >  +		module_put(clk->owner);
>> >  +}
>> >  +EXPORT_SYMBOL(__clk_put);
>
> Why are these exported?  clkdev can only be built into the kernel, as can
> the common clk framework - they can't be modular.  So why would a module
> wish to access these directly?

I must have been mislead by the fact that some ARM sub-architecture exports
those, have added them initially and then didn't think enough about it and
left these in. Actually, at some point I noticed the exporting is not 
needed,
but never did get around to remove it. Thanks. The updated series to 
follow.




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