linux-kernel - Re: [PATCH v1] clkdev: change prototype of clk_register

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Date:	Wed, 4 Feb 2015 17:50:54 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, Stephen Boyd <sboyd@...eaurora.org>,
	Mike Turquette <mturquette@...aro.org>,
	Lee Jones <lee@...nel.org>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Subject: Re: [PATCH v1] clkdev: change prototype of clk_register_clkdev()

On Tue, Feb 03, 2015 at 08:18:54PM +0200, Andy Shevchenko wrote:
> Since clk_register_clkdev() is exported for modules the caller should get a
> pointer to the allocated resources. Otherwise the memory leak is guaranteed on
> the ->remove() stage.
> 
> Cc: Tomeu Vizoso <tomeu.vizoso@...labora.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

One comment, see below. Nothing major so feel free to add,

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

> ---
>  arch/arm/mach-msm/clock-pcom.c         |  9 +++++----
>  arch/arm/mach-vexpress/spc.c           |  5 ++++-
>  arch/mips/ath79/clock.c                |  6 +++---
>  drivers/clk/clk-bcm2835.c              | 12 +++++++-----
>  drivers/clk/clk-max-gen.c              |  9 ++++-----
>  drivers/clk/clk-xgene.c                |  6 +++---
>  drivers/clk/clkdev.c                   | 14 +++++++++-----
>  drivers/clk/samsung/clk-pll.c          | 13 ++++++++-----
>  drivers/clk/samsung/clk-s3c2410-dclk.c | 19 +++++++++---------
>  drivers/clk/samsung/clk.c              | 35 +++++++++++++++++++---------------
>  include/linux/clkdev.h                 |  2 +-
>  11 files changed, 74 insertions(+), 56 deletions(-)

...

> index 6e5c504..e07b1e2 100644
> --- a/drivers/clk/clkdev.c
> +++ b/drivers/clk/clkdev.c
> @@ -307,29 +307,33 @@ EXPORT_SYMBOL(clkdev_drop);
>   * clkdev.
>   *
>   * To make things easier for mass registration, we detect error clks
> - * from a previous clk_register() call, and return the error code for
> + * from a previous clk_register() call, and return the error pointer for
>   * those.  This is to permit this function to be called immediately
>   * after clk_register().
> + *
> + * Return:
> + * pointer to the allocated struct clk_lookup on success, or error pointer
> + * otherwise.

This should probably say how these resources are supposed to be
released.

>   */
> -int clk_register_clkdev(struct clk *clk, const char *con_id,
> +struct clk_lookup *clk_register_clkdev(struct clk *clk, const char *con_id,
>  	const char *dev_fmt, ...)
>  {
>  	struct clk_lookup *cl;
>  	va_list ap;
>  
>  	if (IS_ERR(clk))
> -		return PTR_ERR(clk);
> +		return ERR_CAST(clk);
>  
>  	va_start(ap, dev_fmt);
>  	cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
>  	va_end(ap);
>  
>  	if (!cl)
> -		return -ENOMEM;
> +		return ERR_PTR(-ENOMEM);
>  
>  	clkdev_add(cl);
>  
> -	return 0;
> +	return cl;
>  }
>  EXPORT_SYMBOL(clk_register_clkdev);
--
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