Re: [PATCH v3 3/5] clk: Add common __clk_get(), __clk_put()implementations

[Russell King - ARM Linux]

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@xxxxxxxxxxx>
> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>

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?
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