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Date: Tue, 10 Dec 2019 13:20:29 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: Artur Świgoń <a.swigon@...sung.com>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, linux-pm@...r.kernel.org
Cc: myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
kgene@...nel.org, krzk@...nel.org, b.zolnierkie@...sung.com,
m.szyprowski@...sung.com, inki.dae@...sung.com,
sw0312.kim@...sung.com, k.konieczny@...sung.com,
leonard.crestez@....com
Subject: Re: [PATCH v3 4/4] devfreq: exynos-bus: Clean up code
Hi,
This patch contains the clean-up code related to 'goto' style.
Please merge the the clean-up code of 'goto' to one patch with patch3/patch4.
- patch3 related to 'goto' clean-up code
- patch4 related to remaining clean-up code.
And I added the comment below. Please check them.
On 12/9/19 7:49 PM, Artur Świgoń wrote:
> This patch adds minor improvements to the exynos-bus driver, including
> cleaning up header includes, variables, and return paths.
>
> Signed-off-by: Artur Świgoń <a.swigon@...sung.com>
> ---
> drivers/devfreq/exynos-bus.c | 56 +++++++++++++++---------------------
> 1 file changed, 23 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
> index 0b557df63666..3eb6a043284a 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
>
> @@ -178,7 +177,7 @@ static int exynos_bus_parent_parse_of(struct device_node *np,
> struct device *dev = bus->dev;
> struct opp_table *opp_table;
> const char *vdd = "vdd";
> - int i, ret, count, size;
> + int i, ret, count;
>
> opp_table = dev_pm_opp_set_regulators(dev, &vdd, 1);
> if (IS_ERR(opp_table)) {
> @@ -201,8 +200,7 @@ 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);
ditto.
It depends on personal style. Don't change it because we cannot
modify them at the all device driver. If is not wrong,
just keep the original code.
> if (!bus->edev) {
> ret = -ENOMEM;
> goto err_regulator;
> @@ -301,10 +299,9 @@ 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 +311,14 @@ 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 +328,16 @@ 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 +346,6 @@ 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;
> @@ -359,30 +353,26 @@ 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 */
> - bus->devfreq = devm_devfreq_add_device(dev, profile, DEVFREQ_GOV_PASSIVE,
> + bus->devfreq = devm_devfreq_add_device(dev, profile,
> + DEVFREQ_GOV_PASSIVE,
It is not clean-up. It depends on personal style. Don't change it
because we cannot modify them at the all device driver. If is not wrong,
just keep the original code.
> 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;
> + return PTR_ERR(bus->devfreq);
> }
>
> -err:
> - return ret;
> + return 0;
> }
>
> static int exynos_bus_probe(struct platform_device *pdev)
> @@ -400,18 +390,18 @@ 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);
ditto.
It depends on personal style. Don't change it because we cannot
modify them at the all device driver. If is not wrong,
just keep the original code.
> if (!bus)
> return -ENOMEM;
> mutex_init(&bus->lock);
> - bus->dev = &pdev->dev;
> + bus->dev = dev;
ditto.
It depends on personal style. Don't change it because we cannot
modify them at the all device driver. If is not wrong,
just keep the original code.
> platform_set_drvdata(pdev, bus);
>
> profile = devm_kzalloc(dev, sizeof(*profile), GFP_KERNEL);
> if (!profile)
> return -ENOMEM;
>
> - node = of_parse_phandle(dev->of_node, "devfreq", 0);
> + node = of_parse_phandle(np, "devfreq", 0);
> if (node) {
> of_node_put(node);
> passive = true;
>
--
Best Regards,
Chanwoo Choi
Samsung Electronics
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