linux-kernel - Re: [PATCH] clk: Constify struct clk_init

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Date:	Mon, 14 May 2012 18:19:16 -0700
From:	Saravana Kannan <skannan@...eaurora.org>
To:	"Turquette, Mike" <mturquette@...com>
CC:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Sascha Hauer <s.hauer@...gutronix.de>, andrew@...n.ch,
	rnayak@...com
Subject: Re: [PATCH] clk: Constify struct clk_init_data

On 05/14/2012 02:53 PM, Turquette, Mike wrote:
> On Mon, May 14, 2012 at 7:12 AM, Mark Brown<broonie@...nsource.wolfsonmicro.com>  wrote:
>> Allow drivers to declare their clk_init_data const, the framework really
>> shouldn't be modifying the data.
>>
>> Signed-off-by: Mark Brown<broonie@...nsource.wolfsonmicro.com>
>
> +interested parties
>
> Mark, I like this change but it's reminded me of a few things I meant to
> bring up on the list in the past.  Certainly some folks will mark their
> struct clk_hw_init data as __initconst.  Currently none of the
> documentation mentions that fact and I'm a bit worried about clk code
> which assumes that hw->init will always be around and freely accesses
> it.
>
> I think that, as a rule, hw->init cannot be assumed to be valid after
> clk_register returns.  Would anyone else like to weigh in on it?  If so
> then I'll cook up a follow-up patch to reflect this in the kerneldoc.
>
> Thanks,
> Mike
>
>> ---
>>   include/linux/clk-provider.h |    2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
>> index c1c23b9..fc43ea6 100644
>> --- a/include/linux/clk-provider.h
>> +++ b/include/linux/clk-provider.h
>> @@ -143,7 +143,7 @@ struct clk_init_data {
>>   */
>>   struct clk_hw {
>>         struct clk *clk;
>> -       struct clk_init_data *init;
>> +       const struct clk_init_data *init;

Oh, wait. This won't work for the case where the clock registration is 
completely dynamic. Say, created from device tree or thru some PCI/USB 
device probe, etc. That's why I didn't add it before.

-Saravana

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