linux-kernel - Re: [PATCH] ACPI: AC: fix some errors and warnings reported by checkpatch.pl

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Date:   Wed, 24 Mar 2021 16:57:59 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Xiaofei Tan <tanxiaofei@...wei.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxarm@...neuler.org
Subject: Re: [PATCH] ACPI: AC: fix some errors and warnings reported by checkpatch.pl

On Tue, Mar 23, 2021 at 2:01 PM Xiaofei Tan <tanxiaofei@...wei.com> wrote:
>
> Fix some errors and warnings reported by checkpatch.pl, including
> following five types:

Well, they are coding style issues rather than errors.

> ERROR: "foo * bar" should be "foo *bar"
> ERROR: code indent should use tabs where possible
> WARNING: Block comments use a trailing */ on a separate line
> WARNING: braces {} are not necessary for single statement blocks
> WARNING: void function return statements are not generally useful
>
> Signed-off-by: Xiaofei Tan <tanxiaofei@...wei.com>
> ---
>  drivers/acpi/ac.c | 32 +++++++++++++-------------------
>  1 file changed, 13 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c
> index b86ee6e..07987854 100644
> --- a/drivers/acpi/ac.c
> +++ b/drivers/acpi/ac.c
> @@ -78,17 +78,16 @@ static struct acpi_driver acpi_ac_driver = {
>  struct acpi_ac {
>         struct power_supply *charger;
>         struct power_supply_desc charger_desc;
> -       struct acpi_device * device;
> +       struct acpi_device *device;
>         unsigned long long state;
>         struct notifier_block battery_nb;
>  };
>
>  #define to_acpi_ac(x) power_supply_get_drvdata(x)
>
> -/* --------------------------------------------------------------------------
> -                               AC Adapter Management
> -   -------------------------------------------------------------------------- */
> -
> +/*
> + * AC Adapter Management
> + */

Please use the /* ... */ (one-line) comment format here and below for
comments that aren't longer than one line.

>  static int acpi_ac_get_state(struct acpi_ac *ac)
>  {
>         acpi_status status = AE_OK;
> @@ -109,9 +108,9 @@ static int acpi_ac_get_state(struct acpi_ac *ac)
>         return 0;
>  }
>
> -/* --------------------------------------------------------------------------
> -                            sysfs I/F
> -   -------------------------------------------------------------------------- */
> +/*
> + * sysfs I/F
> + */
>  static int get_ac_property(struct power_supply *psy,
>                            enum power_supply_property psp,
>                            union power_supply_propval *val)
> @@ -138,10 +137,9 @@ static enum power_supply_property ac_props[] = {
>         POWER_SUPPLY_PROP_ONLINE,
>  };
>
> -/* --------------------------------------------------------------------------
> -                                   Driver Model
> -   -------------------------------------------------------------------------- */
> -
> +/*
> + * Driver Model
> + */
>  static void acpi_ac_notify(struct acpi_device *device, u32 event)
>  {
>         struct acpi_ac *ac = acpi_driver_data(device);
> @@ -174,8 +172,6 @@ static void acpi_ac_notify(struct acpi_device *device, u32 event)
>                 acpi_notifier_call_chain(device, event, (u32) ac->state);
>                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
>         }
> -
> -       return;
>  }
>
>  static int acpi_ac_battery_notify(struct notifier_block *nb,
> @@ -282,9 +278,8 @@ static int acpi_ac_add(struct acpi_device *device)
>         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
>         register_acpi_notifier(&ac->battery_nb);
>  end:
> -       if (result) {
> +       if (result)
>                 kfree(ac);
> -       }
>
>         return result;
>  }
> @@ -293,7 +288,7 @@ static int acpi_ac_add(struct acpi_device *device)
>  static int acpi_ac_resume(struct device *dev)
>  {
>         struct acpi_ac *ac;
> -       unsigned old_state;
> +       unsigned int old_state;
>
>         if (!dev)
>                 return -EINVAL;
> @@ -352,9 +347,8 @@ static int __init acpi_ac_init(void)
>         }
>
>         result = acpi_bus_register_driver(&acpi_ac_driver);
> -       if (result < 0) {
> +       if (result < 0)
>                 return -ENODEV;
> -       }
>
>         return 0;
>  }
> --