linux-kernel - Re: [PATCH v1] clk: Convert managed get functions to devm_add

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Date:   Thu, 28 Nov 2019 10:56:30 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Marc Gonzalez <marc.w.gonzalez@...e.fr>
Cc:     linux-clk <linux-clk@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v1] clk: Convert managed get functions to devm_add_action
 API

On Tue 26 Nov 08:13 PST 2019, Marc Gonzalez wrote:

> Date: Tue, 26 Nov 2019 13:56:53 +0100
> 
> Using devm_add_action_or_reset() produces simpler code and smaller
> object size:
> 
> 1 file changed, 16 insertions(+), 46 deletions(-)
> 
>     text	   data	    bss	    dec	    hex	filename
> -   1797	     80	      0	   1877	    755	drivers/clk/clk-devres.o
> +   1499	     56	      0	   1555	    613	drivers/clk/clk-devres.o
> 
> Signed-off-by: Marc Gonzalez <marc.w.gonzalez@...e.fr>

Looks neat

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  drivers/clk/clk-devres.c | 62 +++++++++++-----------------------------
>  1 file changed, 16 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c
> index be160764911b..04379c1f203e 100644
> --- a/drivers/clk/clk-devres.c
> +++ b/drivers/clk/clk-devres.c
> @@ -4,31 +4,29 @@
>  #include <linux/export.h>
>  #include <linux/gfp.h>
>  
> -static void devm_clk_release(struct device *dev, void *res)
> +static void __clk_put(void *clk)
>  {
> -	clk_put(*(struct clk **)res);
> +	clk_put(clk);
>  }
>  
>  struct clk *devm_clk_get(struct device *dev, const char *id)
>  {
> -	struct clk **ptr, *clk;
> +	struct clk *clk = clk_get(dev, id);
>  
> -	ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
> -	if (!ptr)
> -		return ERR_PTR(-ENOMEM);
> -
> -	clk = clk_get(dev, id);
> -	if (!IS_ERR(clk)) {
> -		*ptr = clk;
> -		devres_add(dev, ptr);
> -	} else {
> -		devres_free(ptr);
> -	}
> +	if (!IS_ERR(clk))
> +		if (devm_add_action_or_reset(dev, __clk_put, clk))
> +			clk = ERR_PTR(-ENOMEM);
>  
>  	return clk;
>  }
>  EXPORT_SYMBOL(devm_clk_get);
>  
> +void devm_clk_put(struct device *dev, struct clk *clk)
> +{
> +	devm_release_action(dev, __clk_put, clk);
> +}
> +EXPORT_SYMBOL(devm_clk_put);
> +
>  struct clk *devm_clk_get_optional(struct device *dev, const char *id)
>  {
>  	struct clk *clk = devm_clk_get(dev, id);
> @@ -116,42 +114,14 @@ int __must_check devm_clk_bulk_get_all(struct device *dev,
>  }
>  EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all);
>  
> -static int devm_clk_match(struct device *dev, void *res, void *data)
> -{
> -	struct clk **c = res;
> -	if (!c || !*c) {
> -		WARN_ON(!c || !*c);
> -		return 0;
> -	}
> -	return *c == data;
> -}
> -
> -void devm_clk_put(struct device *dev, struct clk *clk)
> -{
> -	int ret;
> -
> -	ret = devres_release(dev, devm_clk_release, devm_clk_match, clk);
> -
> -	WARN_ON(ret);
> -}
> -EXPORT_SYMBOL(devm_clk_put);
> -
>  struct clk *devm_get_clk_from_child(struct device *dev,
>  				    struct device_node *np, const char *con_id)
>  {
> -	struct clk **ptr, *clk;
> -
> -	ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
> -	if (!ptr)
> -		return ERR_PTR(-ENOMEM);
> +	struct clk *clk = of_clk_get_by_name(np, con_id);
>  
> -	clk = of_clk_get_by_name(np, con_id);
> -	if (!IS_ERR(clk)) {
> -		*ptr = clk;
> -		devres_add(dev, ptr);
> -	} else {
> -		devres_free(ptr);
> -	}
> +	if (!IS_ERR(clk))
> +		if (devm_add_action_or_reset(dev, __clk_put, clk))
> +			clk = ERR_PTR(-ENOMEM);
>  
>  	return clk;
>  }
> -- 
> 2.17.1