linux-kernel - Re: [PATCH 11/23] i2c: kempld: Remove #ifdef guards for PM related functions

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Date:   Thu, 6 Jul 2023 10:37:37 +0800
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Paul Cercueil <paul@...pouillou.net>
CC:     Wolfram Sang <wsa@...nel.org>, <linux-i2c@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 11/23] i2c: kempld: Remove #ifdef guards for PM related
 functions

On Wed,  5 Jul 2023 22:43:02 +0200
Paul Cercueil <paul@...pouillou.net> wrote:

> Use the new PM macros for the suspend and resume functions to be
> automatically dropped by the compiler when CONFIG_PM or
> CONFIG_PM_SLEEP are disabled, without having to use #ifdef guards.
> 
> This has the advantage of always compiling these functions in,
> independently of any Kconfig option. Thanks to that, bugs and other
> regressions are subsequently easier to catch.
> 
> Note that the driver should most likely be updated to use the
> platform_driver.driver.pm.{suspend,resume} callbacks.

Agreed.  In this particular case I'd be tempted to do that first
so that we don't introduce pm_ptr() usage for these hooks.
Look at the platform device core, I suspect they should be pm_sleep_ptr()
but not 100% sure.

Jonathan

> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  drivers/i2c/busses/i2c-kempld.c | 9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-kempld.c b/drivers/i2c/busses/i2c-kempld.c
> index 281058e3ea46..cb61e7b9202c 100644
> --- a/drivers/i2c/busses/i2c-kempld.c
> +++ b/drivers/i2c/busses/i2c-kempld.c
> @@ -350,7 +350,6 @@ static void kempld_i2c_remove(struct platform_device *pdev)
>  	i2c_del_adapter(&i2c->adap);
>  }
>  
> -#ifdef CONFIG_PM
>  static int kempld_i2c_suspend(struct platform_device *pdev, pm_message_t state)
>  {
>  	struct kempld_i2c_data *i2c = platform_get_drvdata(pdev);
> @@ -377,10 +376,6 @@ static int kempld_i2c_resume(struct platform_device *pdev)
>  
>  	return 0;
>  }
> -#else
> -#define kempld_i2c_suspend	NULL
> -#define kempld_i2c_resume	NULL
> -#endif
>  
>  static struct platform_driver kempld_i2c_driver = {
>  	.driver = {
> @@ -388,8 +383,8 @@ static struct platform_driver kempld_i2c_driver = {
>  	},
>  	.probe		= kempld_i2c_probe,
>  	.remove_new	= kempld_i2c_remove,
> -	.suspend	= kempld_i2c_suspend,
> -	.resume		= kempld_i2c_resume,
> +	.suspend	= pm_ptr(kempld_i2c_suspend),
> +	.resume		= pm_ptr(kempld_i2c_resume),
>  };
>  
>  module_platform_driver(kempld_i2c_driver);