linux-kernel - Re: [PATCH] platform/chrome: cros_ec: Make cros_ec

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Date:   Tue, 19 Oct 2021 14:31:46 -0700
From:   Guenter Roeck <groeck@...gle.com>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        kernel@...gutronix.de
Subject: Re: [PATCH] platform/chrome: cros_ec: Make cros_ec_unregister()
 return void

On Tue, Oct 19, 2021 at 1:39 PM Uwe Kleine-König
<u.kleine-koenig@...gutronix.de> wrote:
>
> Up to now cros_ec_unregister() returns zero unconditionally. Make it
> return void instead which makes it easier to see in the callers that
> there is no error to handle.
>
> Also the return value of i2c, platform and spi remove callbacks is
> ignored anyway.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> ---
>  drivers/platform/chrome/cros_ec.c     | 2 +-
>  drivers/platform/chrome/cros_ec.h     | 2 +-
>  drivers/platform/chrome/cros_ec_i2c.c | 4 +++-
>  drivers/platform/chrome/cros_ec_lpc.c | 4 +++-
>  drivers/platform/chrome/cros_ec_spi.c | 4 +++-
>  5 files changed, 11 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec.c b/drivers/platform/chrome/cros_ec.c
> index fc5aa1525d13..eeb94b3563e2 100644
> --- a/drivers/platform/chrome/cros_ec.c
> +++ b/drivers/platform/chrome/cros_ec.c
> @@ -302,7 +302,7 @@ EXPORT_SYMBOL(cros_ec_register);
>   *
>   * Return: 0 on success or negative error code.
>   */
> -int cros_ec_unregister(struct cros_ec_device *ec_dev)
> +void cros_ec_unregister(struct cros_ec_device *ec_dev)
>  {
>         if (ec_dev->pd)
>                 platform_device_unregister(ec_dev->pd);

Isn't there a "return 0;" hiding about here which would now result in
a compile error ?

Guenter

> diff --git a/drivers/platform/chrome/cros_ec.h b/drivers/platform/chrome/cros_ec.h
> index 78363dcfdf23..bbca0096868a 100644
> --- a/drivers/platform/chrome/cros_ec.h
> +++ b/drivers/platform/chrome/cros_ec.h
> @@ -11,7 +11,7 @@
>  #include <linux/interrupt.h>
>
>  int cros_ec_register(struct cros_ec_device *ec_dev);
> -int cros_ec_unregister(struct cros_ec_device *ec_dev);
> +void cros_ec_unregister(struct cros_ec_device *ec_dev);
>
>  int cros_ec_suspend(struct cros_ec_device *ec_dev);
>  int cros_ec_resume(struct cros_ec_device *ec_dev);
> diff --git a/drivers/platform/chrome/cros_ec_i2c.c b/drivers/platform/chrome/cros_ec_i2c.c
> index 30c8938c27d5..22feb0fd4ce7 100644
> --- a/drivers/platform/chrome/cros_ec_i2c.c
> +++ b/drivers/platform/chrome/cros_ec_i2c.c
> @@ -313,7 +313,9 @@ static int cros_ec_i2c_remove(struct i2c_client *client)
>  {
>         struct cros_ec_device *ec_dev = i2c_get_clientdata(client);
>
> -       return cros_ec_unregister(ec_dev);
> +       cros_ec_unregister(ec_dev);
> +
> +       return 0;
>  }
>
>  #ifdef CONFIG_PM_SLEEP
> diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
> index 1f7861944044..8527a1bac765 100644
> --- a/drivers/platform/chrome/cros_ec_lpc.c
> +++ b/drivers/platform/chrome/cros_ec_lpc.c
> @@ -439,7 +439,9 @@ static int cros_ec_lpc_remove(struct platform_device *pdev)
>                 acpi_remove_notify_handler(adev->handle, ACPI_ALL_NOTIFY,
>                                            cros_ec_lpc_acpi_notify);
>
> -       return cros_ec_unregister(ec_dev);
> +       cros_ec_unregister(ec_dev);
> +
> +       return 0;
>  }
>
>  static const struct acpi_device_id cros_ec_lpc_acpi_device_ids[] = {
> diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c
> index 14c4046fa04d..713c58687721 100644
> --- a/drivers/platform/chrome/cros_ec_spi.c
> +++ b/drivers/platform/chrome/cros_ec_spi.c
> @@ -790,7 +790,9 @@ static int cros_ec_spi_remove(struct spi_device *spi)
>  {
>         struct cros_ec_device *ec_dev = spi_get_drvdata(spi);
>
> -       return cros_ec_unregister(ec_dev);
> +       cros_ec_unregister(ec_dev);
> +
> +       return 0;
>  }
>
>  #ifdef CONFIG_PM_SLEEP
> --
> 2.30.2
>