[PATCH] CLKDEV: Add helper routines to allocate and add clkdevs for given struct clk *

[cavokz@gmail.com (Domenico Andreoli)]

On Mon, Apr 16, 2012 at 07:09:32PM +0530, viresh kumar wrote:
> V2:
> 
> From: Russell King <rmk+kernel@arm.linux.org.uk>
> CLKDEV: Add helper routines to allocate and add clkdevs for given struct clk *
> 
> With common clock framework, clks are allocated at runtime. Some of them require
> clkdevs to be allocated and added in global clkdev list.
> 
> This patch introduces helper routines to:
> 
>  - allocate and add single clkdev for a single clk structure.
>  - add multiple clkdevs for a single clk structure.
> 
> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
> Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
> ---
>  drivers/clk/clkdev.c   |   64 +++++++++++++++++++++++++++++++++++++++++++----
>  include/linux/clkdev.h |    3 ++
>  2 files changed, 61 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
> index 6db161f..0a28374 100644
> --- a/drivers/clk/clkdev.c
> +++ b/drivers/clk/clkdev.c
> @@ -116,8 +116,9 @@ struct clk_lookup_alloc {
>  	char	con_id[MAX_CON_ID];
>  };
> 
> -struct clk_lookup * __init_refok
> -clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
> +static struct clk_lookup * __init_refok
> +clkdev_alloc_valist(struct clk *clk, const char *con_id, const char *dev_fmt,
> +		va_list ap)
>  {
>  	struct clk_lookup_alloc *cla;
> 
> @@ -132,16 +133,29 @@ clkdev_alloc(struct clk *clk, const char
> *con_id, const char *dev_fmt, ...)
>  	}
> 
>  	if (dev_fmt) {
> -		va_list ap;
> -
> -		va_start(ap, dev_fmt);
>  		vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
>  		cla->cl.dev_id = cla->dev_id;
> -		va_end(ap);
>  	}
> 
>  	return &cla->cl;
>  }
> +
> +struct clk_lookup * __init_refok
> +clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
> +{
> +	struct clk_lookup * cl;
> +	va_list ap = NULL;

gcc complains because of this initialization:

drivers/clk/clkdev.c: In function 'clkdev_alloc':
drivers/clk/clkdev.c:149:2: error: invalid initializer
drivers/clk/clkdev.c: In function 'clk_register_single_clkdev':
drivers/clk/clkdev.c:197:2: error: invalid initializer
make[2]: *** [drivers/clk/clkdev.o] Error 1
make[1]: *** [drivers/clk] Error 2


so I finally tested it with this modification:

	if (dev_fmt) {
		va_start(ap, dev_fmt);
		cl = clkdev_alloc_valist(clk, con_id, dev_fmt, ap);
		va_end(ap);
	} else
		cl = clkdev_alloc(clk, con_id, NULL);

> +
> +	return cl;
> +}
>  EXPORT_SYMBOL(clkdev_alloc);
> 
>  int clk_add_alias(const char *alias, const char *alias_dev_name, char *id,
> @@ -173,3 +187,41 @@ void clkdev_drop(struct clk_lookup *cl)
>  	kfree(cl);
>  }
>  EXPORT_SYMBOL(clkdev_drop);
> +
> +int clk_register_single_clkdev(struct clk *clk, const char *con_id,
> +		const char *dev_fmt, ...)
> +{
> +	struct clk_lookup * cl;
> +	va_list ap = NULL;
> +
> +	if (dev_fmt)
> +		va_start(ap, dev_fmt);
> +
> +	cl = clkdev_alloc_valist(clk, con_id, dev_fmt, ap);
> +
> +	if (dev_fmt)
> +		va_end(ap);
> +
> +	if (!cl)
> +		return -ENOMEM;

same as above

I'm not a C legal, why this error? Thanks.

cheers,
Domenico