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

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Message-ID: <20120514215304.GB3075@gmail.com>
Date:	Mon, 14 May 2012 14:53:04 -0700
From:	"Turquette, Mike" <mturquette@...com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Saravana Kannan <skannan@...eaurora.org>,
	Sascha Hauer <s.hauer@...gutronix.de>, andrew@...n.ch,
	rnayak@...com
Subject: Re: [PATCH] clk: Constify struct clk_init_data

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;
>  };
>
>  /*
> --
> 1.7.10
>

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