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Date: Thu, 25 Jul 2019 21:50:53 +0900
From: Chanwoo Choi <cwchoi00@...il.com>
To: Artur Świgoń <a.swigon@...tner.samsung.com>
Cc: devicetree <devicetree@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Linux PM list <linux-pm@...r.kernel.org>,
dri-devel <dri-devel@...ts.freedesktop.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Chanwoo Choi <cw00.choi@...sung.com>,
MyungJoo Ham <myungjoo.ham@...sung.com>, inki.dae@...sung.com,
Seung-Woo Kim <sw0312.kim@...sung.com>,
georgi.djakov@...aro.org,
Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [RFC PATCH 04/11] devfreq: exynos-bus: Clean up code
2019년 7월 24일 (수) 오전 8:07, Artur Świgoń <a.swigon@...tner.samsung.com>님이 작성:
>
> This patch adds minor improvements to the exynos-bus driver.
>
> Signed-off-by: Artur Świgoń <a.swigon@...tner.samsung.com>
> ---
> drivers/devfreq/exynos-bus.c | 49 ++++++++++++++++--------------------
> 1 file changed, 22 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
> index 4bb83b945bf7..412511ca7703 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
> #define DEFAULT_VOLTAGE_TOLERANCE 2
> @@ -256,7 +255,7 @@ static int exynos_bus_parent_parse_of(struct device_node *np,
> struct exynos_bus *bus)
> {
> struct device *dev = bus->dev;
> - int i, ret, count, size;
> + int i, ret, count;
>
> /* Get the regulator to provide each bus with the power */
> bus->regulator = devm_regulator_get(dev, "vdd");
> @@ -283,8 +282,7 @@ static int exynos_bus_parent_parse_of(struct device_node *np,
> }
> bus->edev_count = count;
>
> - size = sizeof(*bus->edev) * count;
> - bus->edev = devm_kzalloc(dev, size, GFP_KERNEL);
> + bus->edev = devm_kcalloc(dev, count, sizeof(*bus->edev), GFP_KERNEL);
> if (!bus->edev) {
> ret = -ENOMEM;
> goto err_regulator;
> @@ -388,7 +386,7 @@ static int exynos_bus_profile_init(struct exynos_bus *bus,
> ondemand_data = devm_kzalloc(dev, sizeof(*ondemand_data), GFP_KERNEL);
> if (!ondemand_data) {
> ret = -ENOMEM;
> - goto err;
> + goto out;
> }
> ondemand_data->upthreshold = 40;
> ondemand_data->downdifferential = 5;
> @@ -400,14 +398,14 @@ static int exynos_bus_profile_init(struct exynos_bus *bus,
> if (IS_ERR(bus->devfreq)) {
> dev_err(dev, "failed to add devfreq device\n");
> ret = PTR_ERR(bus->devfreq);
> - goto err;
> + goto out;
> }
>
> /* 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;
> + goto out;
> }
>
> /*
> @@ -417,16 +415,16 @@ 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;
> + goto out;
> }
>
> ret = exynos_bus_set_event(bus);
> if (ret < 0) {
> dev_err(dev, "failed to set event to devfreq-event devices\n");
> - goto err;
> + goto out;
> }
>
> -err:
> +out:
> return ret;
> }
>
> @@ -446,27 +444,28 @@ static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
> parent_devfreq = devfreq_get_devfreq_by_phandle(dev, 0);
> if (IS_ERR(parent_devfreq)) {
> ret = -EPROBE_DEFER;
> - goto err;
> + goto out;
> }
>
> passive_data = devm_kzalloc(dev, sizeof(*passive_data), GFP_KERNEL);
> if (!passive_data) {
> ret = -ENOMEM;
> - goto err;
> + goto out;
> }
> passive_data->parent = parent_devfreq;
>
> /* Add devfreq device for exynos bus with passive governor */
> - bus->devfreq = devm_devfreq_add_device(dev, profile, DEVFREQ_GOV_PASSIVE,
> + bus->devfreq = devm_devfreq_add_device(dev, profile,
> + DEVFREQ_GOV_PASSIVE,
> passive_data);
> if (IS_ERR(bus->devfreq)) {
> dev_err(dev,
> "failed to add devfreq dev with passive governor\n");
> ret = PTR_ERR(bus->devfreq);
> - goto err;
> + goto out;
> }
>
> -err:
> +out:
> return ret;
> }
>
> @@ -484,11 +483,11 @@ static int exynos_bus_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
> + bus = devm_kzalloc(dev, sizeof(*bus), GFP_KERNEL);
> if (!bus)
> return -ENOMEM;
> mutex_init(&bus->lock);
> - bus->dev = &pdev->dev;
> + bus->dev = dev;
> platform_set_drvdata(pdev, bus);
>
> /* Parse the device-tree to get the resource information */
> @@ -502,7 +501,7 @@ static int exynos_bus_probe(struct platform_device *pdev)
> goto err;
> }
>
> - node = of_parse_phandle(dev->of_node, "devfreq", 0);
> + node = of_parse_phandle(np, "devfreq", 0);
> if (node) {
> of_node_put(node);
> ret = exynos_bus_profile_init_passive(bus, profile);
> @@ -547,12 +546,10 @@ static int exynos_bus_resume(struct device *dev)
> int ret;
>
> ret = exynos_bus_enable_edev(bus);
> - if (ret < 0) {
> + if (ret < 0)
> dev_err(dev, "failed to enable the devfreq-event devices\n");
> - return ret;
> - }
>
> - return 0;
> + return ret;
> }
>
> static int exynos_bus_suspend(struct device *dev)
> @@ -561,12 +558,10 @@ static int exynos_bus_suspend(struct device *dev)
> int ret;
>
NACK.
> ret = exynos_bus_disable_edev(bus);
> - if (ret < 0) {
> + if (ret < 0)
> dev_err(dev, "failed to disable the devfreq-event devices\n");
> - return ret;
> - }
>
> - return 0;
> + return ret;
> }
> #endif
>
> --
> 2.17.1
>
NACK.
As I already commented, It has never any benefit.
I think that it is not usful. Please drop it.
--
Best Regards,
Chanwoo Choi
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