Re: [PATCH v2] PM / devfreq: exynos-bus: Reduce the numer of goto statements and remove unused headers

[Chanwoo Choi]

Hi,

s/numer/number

But, remove 'the number of' from patch title
in order to make patch title under 80 char.

On 12/16/19 7:47 PM, Artur ÅwigoÅ wrote:
> This patch improves code readability by changing the following construct:
> 
>     if (cond)
>         goto passive;
>     foo();
>     goto out;
> passive:
>     bar();
> out:
> 
> into this:
> 
>     if (cond)
>         bar();
>     else
>         foo();
> 

And remove the example because it is too long and I think
that it is enough to explain what to do patch description.

I edit them by myself and applied it. Thanks.

> as well as eliminating a few more goto statements (related to return
> paths).
> 
> Moreover, this patch removes unused header file includes and adds a missing
> include <linux/of.h>.
> 
> Signed-off-by: Artur ÅwigoÅ <a.swigon@xxxxxxxxxxx>
> ---
>  drivers/devfreq/exynos-bus.c | 54 +++++++++++++-----------------------
>  1 file changed, 19 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
> index 19d9f9f8ced2..7f5917d59072 100644
> --- a/drivers/devfreq/exynos-bus.c
> +++ b/drivers/devfreq/exynos-bus.c
> @@ -15,11 +15,10 @@
>  #include <linux/device.h>
>  #include <linux/export.h>
>  #include <linux/module.h>
> -#include <linux/of_device.h>
> +#include <linux/of.h>
>  #include <linux/pm_opp.h>
>  #include <linux/platform_device.h>
>  #include <linux/regulator/consumer.h>
> -#include <linux/slab.h>
>  
>  #define DEFAULT_SATURATION_RATIO	40
>  
> @@ -301,10 +300,9 @@ static int exynos_bus_profile_init(struct exynos_bus *bus,
>  	profile->exit = exynos_bus_exit;
>  
>  	ondemand_data = devm_kzalloc(dev, sizeof(*ondemand_data), GFP_KERNEL);
> -	if (!ondemand_data) {
> -		ret = -ENOMEM;
> -		goto err;
> -	}
> +	if (!ondemand_data)
> +		return -ENOMEM;
> +
>  	ondemand_data->upthreshold = 40;
>  	ondemand_data->downdifferential = 5;
>  
> @@ -314,15 +312,14 @@ static int exynos_bus_profile_init(struct exynos_bus *bus,
>  						ondemand_data);
>  	if (IS_ERR(bus->devfreq)) {
>  		dev_err(dev, "failed to add devfreq device\n");
> -		ret = PTR_ERR(bus->devfreq);
> -		goto err;
> +		return PTR_ERR(bus->devfreq);
>  	}
>  
>  	/* Register opp_notifier to catch the change of OPP  */
>  	ret = devm_devfreq_register_opp_notifier(dev, bus->devfreq);
>  	if (ret < 0) {
>  		dev_err(dev, "failed to register opp notifier\n");
> -		goto err;
> +		return ret;
>  	}
>  
>  	/*
> @@ -332,17 +329,16 @@ static int exynos_bus_profile_init(struct exynos_bus *bus,
>  	ret = exynos_bus_enable_edev(bus);
>  	if (ret < 0) {
>  		dev_err(dev, "failed to enable devfreq-event devices\n");
> -		goto err;
> +		return ret;
>  	}
>  
>  	ret = exynos_bus_set_event(bus);
>  	if (ret < 0) {
>  		dev_err(dev, "failed to set event to devfreq-event devices\n");
> -		goto err;
> +		return ret;
>  	}
>  
> -err:
> -	return ret;
> +	return 0;
>  }
>  
>  static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
> @@ -351,7 +347,6 @@ static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
>  	struct device *dev = bus->dev;
>  	struct devfreq_passive_data *passive_data;
>  	struct devfreq *parent_devfreq;
> -	int ret = 0;
>  
>  	/* Initialize the struct profile and governor data for passive device */
>  	profile->target = exynos_bus_target;
> @@ -359,16 +354,13 @@ static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
>  
>  	/* Get the instance of parent devfreq device */
>  	parent_devfreq = devfreq_get_devfreq_by_phandle(dev, 0);
> -	if (IS_ERR(parent_devfreq)) {
> -		ret = -EPROBE_DEFER;
> -		goto err;
> -	}
> +	if (IS_ERR(parent_devfreq))
> +		return -EPROBE_DEFER;
>  
>  	passive_data = devm_kzalloc(dev, sizeof(*passive_data), GFP_KERNEL);
> -	if (!passive_data) {
> -		ret = -ENOMEM;
> -		goto err;
> -	}
> +	if (!passive_data)
> +		return -ENOMEM;
> +
>  	passive_data->parent = parent_devfreq;
>  
>  	/* Add devfreq device for exynos bus with passive governor */
> @@ -377,12 +369,10 @@ static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
>  	if (IS_ERR(bus->devfreq)) {
>  		dev_err(dev,
>  			"failed to add devfreq dev with passive governor\n");
> -		ret = PTR_ERR(bus->devfreq);
> -		goto err;
> +		return PTR_ERR(bus->devfreq);
>  	}
>  
> -err:
> -	return ret;
> +	return 0;
>  }
>  
>  static int exynos_bus_probe(struct platform_device *pdev)
> @@ -427,19 +417,13 @@ static int exynos_bus_probe(struct platform_device *pdev)
>  		goto err_reg;
>  
>  	if (passive)
> -		goto passive;
> -
> -	ret = exynos_bus_profile_init(bus, profile);
> -	if (ret < 0)
> -		goto err;
> +		ret = exynos_bus_profile_init_passive(bus, profile);
> +	else
> +		ret = exynos_bus_profile_init(bus, profile);
>  
> -	goto out;
> -passive:
> -	ret = exynos_bus_profile_init_passive(bus, profile);
>  	if (ret < 0)
>  		goto err;
>  
> -out:
>  	max_state = bus->devfreq->profile->max_state;
>  	min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
>  	max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics