linux-kernel - Re: [PATCH] devfreq/exynos-bus: Use common error handling code in exynos_bus

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Date:   Mon, 23 Oct 2017 10:17:07 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] devfreq/exynos-bus: Use common error handling code in
 exynos_bus_target()

Hi Markus,

As I already commented on your other patch related to extcon-max14577,
this patch might remove the redundant error message. But, it makes
the code more complicated in side of readability. I prefer existing code.

On 2017년 10월 22일 22:40, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sun, 22 Oct 2017 15:33:06 +0200
> 
> Adjust jump targets so that a bit of exception handling can be better
> reused at the end of this function.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/devfreq/exynos-bus.c | 21 ++++++++++-----------
>  1 file changed, 10 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
> index 49f68929e024..e38d456b2d7d 100644
> --- a/drivers/devfreq/exynos-bus.c
> +++ b/drivers/devfreq/exynos-bus.c
> @@ -124,34 +124,33 @@ static int exynos_bus_target(struct device *dev, unsigned long *freq, u32 flags)
>  
>  	if (old_freq < new_freq) {
>  		ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol);
> -		if (ret < 0) {
> -			dev_err(bus->dev, "failed to set voltage\n");
> -			goto out;
> -		}
> +		if (ret < 0)
> +			goto report_failure;
>  	}
>  
>  	ret = clk_set_rate(bus->clk, new_freq);
>  	if (ret < 0) {
>  		dev_err(dev, "failed to change clock of bus\n");
>  		clk_set_rate(bus->clk, old_freq);
> -		goto out;
> +		goto unlock;
>  	}
>  
>  	if (old_freq > new_freq) {
>  		ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol);
> -		if (ret < 0) {
> -			dev_err(bus->dev, "failed to set voltage\n");
> -			goto out;
> -		}
> +		if (ret < 0)
> +			goto report_failure;
>  	}
>  	bus->curr_freq = new_freq;
>  
>  	dev_dbg(dev, "Set the frequency of bus (%luHz -> %luHz, %luHz)\n",
>  			old_freq, new_freq, clk_get_rate(bus->clk));
> -out:
> +unlock:
>  	mutex_unlock(&bus->lock);
> -
>  	return ret;
> +
> +report_failure:
> +	dev_err(bus->dev, "failed to set voltage\n");
> +	goto unlock;
>  }
>  
>  static int exynos_bus_get_dev_status(struct device *dev,
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics