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Date: Mon, 16 Dec 2019 20:27:16 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: Artur Świgoń <a.swigon@...sung.com>,
linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...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
Subject: Re: [PATCH v2] PM / devfreq: exynos-bus: Reduce the numer of goto
statements and remove unused headers
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 Świgoń 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 Świgoń <a.swigon@...sung.com>
> ---
> 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
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