linux-kernel - Re: [RFC PATCH 01/11] devfreq: exynos-bus: Extract exynos_bus_profile

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Date:   Wed, 24 Jul 2019 21:07:41 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Artur Świgoń <a.swigon@...tner.samsung.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        cw00.choi@...sung.com, myungjoo.ham@...sung.com,
        inki.dae@...sung.com, sw0312.kim@...sung.com,
        georgi.djakov@...aro.org, m.szyprowski@...sung.com
Subject: Re: [RFC PATCH 01/11] devfreq: exynos-bus: Extract
 exynos_bus_profile_init()

On Tue, Jul 23, 2019 at 02:20:06PM +0200, Artur Świgoń wrote:
> This patch adds a new static function, exynos_bus_profile_init(), extracted
> from exynos_bus_probe().
> 
> Signed-off-by: Artur Świgoń <a.swigon@...tner.samsung.com>
> ---
>  drivers/devfreq/exynos-bus.c | 106 ++++++++++++++++++++---------------
>  1 file changed, 60 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
> index d9f377912c10..d8f1efaf2d49 100644
> --- a/drivers/devfreq/exynos-bus.c
> +++ b/drivers/devfreq/exynos-bus.c
> @@ -372,12 +372,69 @@ static int exynos_bus_parse_of(struct device_node *np,
>  	return ret;
>  }
>  
> +static int exynos_bus_profile_init(struct exynos_bus *bus,
> +				   struct devfreq_dev_profile *profile)
> +{
> +	struct device *dev = bus->dev;
> +	struct devfreq_simple_ondemand_data *ondemand_data;
> +	int ret;
> +
> +	/* Initialize the struct profile and governor data for parent device */
> +	profile->polling_ms = 50;
> +	profile->target = exynos_bus_target;
> +	profile->get_dev_status = exynos_bus_get_dev_status;
> +	profile->exit = exynos_bus_exit;
> +
> +	ondemand_data = devm_kzalloc(dev, sizeof(*ondemand_data), GFP_KERNEL);
> +	if (!ondemand_data) {
> +		ret = -ENOMEM;
> +		goto err;

Just return proper error code. Less lines, obvious code since you do not
have any cleanup in error path.

> +	}
> +	ondemand_data->upthreshold = 40;
> +	ondemand_data->downdifferential = 5;
> +
> +	/* Add devfreq device to monitor and handle the exynos bus */
> +	bus->devfreq = devm_devfreq_add_device(dev, profile,
> +						DEVFREQ_GOV_SIMPLE_ONDEMAND,
> +						ondemand_data);
> +	if (IS_ERR(bus->devfreq)) {
> +		dev_err(dev, "failed to add devfreq device\n");
> +		ret = PTR_ERR(bus->devfreq);
> +		goto err;
> +	}
> +
> +	/* 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;

The same - return err.

Best regards,
Krzysztof