linux-kernel - Re: [PATCH 7/8] watchdog: tegra_wdt: Remove #ifdef guards for PM related functions

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Date:   Tue, 28 Jun 2022 13:03:43 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH 7/8] watchdog: tegra_wdt: Remove #ifdef guards for PM
 related functions

On Tue, Jun 28, 2022 at 08:34:48PM +0100, Paul Cercueil wrote:
> Use the new DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr() macros to
> handle the .suspend/.resume callbacks.
> 
> These macros allow the suspend and resume functions to be automatically
> dropped by the compiler when CONFIG_SUSPEND is disabled, without having
> to use #ifdef guards. Not using #ifdef guards means that the code is
> always compiled independently of any Kconfig option, and thanks to that
> bugs and regressions are easier to catch.
> 
> While at it, the functions tegra_wdt_runtime_{suspend,resume} were
> renamed to tegra_wdt_{suspend,resume}, as they are *not* runtime-PM
> callbacks, but standard system suspend/resume callbacks.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Cc: Jonathan Hunter <jonathanh@...dia.com>
> Cc: linux-tegra@...r.kernel.org

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/watchdog/tegra_wdt.c | 14 +++++---------
>  1 file changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/watchdog/tegra_wdt.c b/drivers/watchdog/tegra_wdt.c
> index dfe06e506cad..d5de6c0657a5 100644
> --- a/drivers/watchdog/tegra_wdt.c
> +++ b/drivers/watchdog/tegra_wdt.c
> @@ -230,8 +230,7 @@ static int tegra_wdt_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -#ifdef CONFIG_PM_SLEEP
> -static int tegra_wdt_runtime_suspend(struct device *dev)
> +static int tegra_wdt_suspend(struct device *dev)
>  {
>  	struct tegra_wdt *wdt = dev_get_drvdata(dev);
>  
> @@ -241,7 +240,7 @@ static int tegra_wdt_runtime_suspend(struct device *dev)
>  	return 0;
>  }
>  
> -static int tegra_wdt_runtime_resume(struct device *dev)
> +static int tegra_wdt_resume(struct device *dev)
>  {
>  	struct tegra_wdt *wdt = dev_get_drvdata(dev);
>  
> @@ -250,7 +249,6 @@ static int tegra_wdt_runtime_resume(struct device *dev)
>  
>  	return 0;
>  }
> -#endif
>  
>  static const struct of_device_id tegra_wdt_of_match[] = {
>  	{ .compatible = "nvidia,tegra30-timer", },
> @@ -258,16 +256,14 @@ static const struct of_device_id tegra_wdt_of_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, tegra_wdt_of_match);
>  
> -static const struct dev_pm_ops tegra_wdt_pm_ops = {
> -	SET_SYSTEM_SLEEP_PM_OPS(tegra_wdt_runtime_suspend,
> -				tegra_wdt_runtime_resume)
> -};
> +static DEFINE_SIMPLE_DEV_PM_OPS(tegra_wdt_pm_ops,
> +				tegra_wdt_suspend, tegra_wdt_resume);
>  
>  static struct platform_driver tegra_wdt_driver = {
>  	.probe		= tegra_wdt_probe,
>  	.driver		= {
>  		.name	= "tegra-wdt",
> -		.pm	= &tegra_wdt_pm_ops,
> +		.pm	= pm_sleep_ptr(&tegra_wdt_pm_ops),
>  		.of_match_table = tegra_wdt_of_match,
>  	},
>  };
> -- 
> 2.35.1
>