Re: [PATCH v1 2/4] usb: ehci-exynos: Switch from CONFIG_PM guards to pm_ptr()

From: Johan Hovold <johan@kernel.org>
To: Anand Moon <linux.amoon@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 2/4] usb: ehci-exynos: Switch from CONFIG_PM guards to pm_ptr()
Date: Mon, 4 Mar 2024 10:21:43 +0100	[thread overview]
Message-ID: <ZeWSp4ohOhHGclud@hovoldconsulting.com> (raw)
In-Reply-To: <20240301193831.3346-3-linux.amoon@gmail.com>

On Sat, Mar 02, 2024 at 01:08:09AM +0530, Anand Moon wrote:
> Use the new PM macros for the suspend and resume functions to be
> automatically dropped by the compiler when CONFIG_PM are disabled,
> without having to use #ifdef guards. If CONFIG_PM unused,
> they will simply be discarded by the compiler.
> 
> Use RUNTIME_PM_OPS runtime macro for suspend/resume function.
> 
> Signed-off-by: Anand Moon <linux.amoon@gmail.com>
> ---
>  drivers/usb/host/ehci-exynos.c | 10 ++--------
>  1 file changed, 2 insertions(+), 8 deletions(-)

>  static const struct dev_pm_ops exynos_ehci_pm_ops = {
> -	.suspend	= exynos_ehci_suspend,
> -	.resume		= exynos_ehci_resume,
> +	RUNTIME_PM_OPS(exynos_ehci_suspend, exynos_ehci_resume, NULL)
>  };

This is also broken and clearly not tested. See the definition of
RUNTIME_PM_OPS() which sets the runtime pm callbacks, not the suspend
ones:

	#define RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
		.runtime_suspend = suspend_fn, \
		.runtime_resume = resume_fn, \
		.runtime_idle = idle_fn,

Johan