Re: [PATCH v3 1/9] ACPI / PM: Let acpi_dev_pm_detach() return an error code

From: Pavel Machek <pavel@ucw.cz>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <len.brown@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-acpi@vger.kernel.org,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Kevin Hilman <khilman@linaro.org>,
	Alan Stern <stern@rowland.harvard.edu>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Tomasz Figa <tomasz.figa@gmail.com>,
	devicetree@vger.kernel.org,
	Linus Walleij <linus.walleij@linaro.org>,
	Simon Horman <horms@verge.net.au>,
	Magnus Damm <magnus.damm@gmail.com>,
	Ben Dooks <ben-linux@fluff.org>,
	Kukjin Kim <kgene.kim@samsung.com>,
	Stephen Boyd <sboyd@codeaurora.org>,
	Philipp Zabel <philipp.zabel@gmail.com>,
	Mark Brown <broonie@kernel.org>, Wolfram Sang <wsa@the-dreams.de>,
	Chris Ball <chris@printf.net>,
	Russell King <linux@arm.linux.org.uk>
Subject: Re: [PATCH v3 1/9] ACPI / PM: Let acpi_dev_pm_detach() return an error code
Date: Sun, 24 Aug 2014 00:45:15 +0200	[thread overview]
Message-ID: <20140823224515.GA19046@xo-6d-61-c0.localdomain> (raw)
In-Reply-To: <1409838756-31963-2-git-send-email-ulf.hansson@linaro.org>

On Thu 2014-09-04 15:52:28, Ulf Hansson wrote:
> To give callers the option of acting on a errors while removing the
> pm_domain ops for the device in the ACPI PM domain, let
> acpi_dev_pm_detach() return an int to provide the error code.
> 
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
> Tested-by: Philipp Zabel <p.zabel@pengutronix.de>

Acked-by: Pavel Machek <Pavel@ucw.cz>

> ---
>  drivers/acpi/device_pm.c | 8 +++++++-
>  include/linux/acpi.h     | 7 +++++--
>  2 files changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
> index 67075f8..0d52ce1 100644
> --- a/drivers/acpi/device_pm.c
> +++ b/drivers/acpi/device_pm.c
> @@ -1055,6 +1055,8 @@ static struct dev_pm_domain acpi_general_pm_domain = {
>   *
>   * Callers must ensure proper synchronization of this function with power
>   * management callbacks.
> + *
> + * Returns 0 on successfully attached PM domain or negative error code.
>   */
>  int acpi_dev_pm_attach(struct device *dev, bool power_on)
>  {
> @@ -1087,8 +1089,10 @@ EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);
>   *
>   * Callers must ensure proper synchronization of this function with power
>   * management callbacks.
> + *
> + * Returns 0 on successfully detached PM domain or negative error code.
>   */
> -void acpi_dev_pm_detach(struct device *dev, bool power_off)
> +int acpi_dev_pm_detach(struct device *dev, bool power_off)
>  {
>  	struct acpi_device *adev = ACPI_COMPANION(dev);
>  
> @@ -1107,7 +1111,9 @@ void acpi_dev_pm_detach(struct device *dev, bool power_off)
>  			acpi_device_wakeup(adev, ACPI_STATE_S0, false);
>  			acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
>  		}
> +		return 0;
>  	}
> +	return -EINVAL;
>  }
>  EXPORT_SYMBOL_GPL(acpi_dev_pm_detach);
>  #endif /* CONFIG_PM */
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 807cbc4..c83cca5 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -587,7 +587,7 @@ static inline int acpi_subsys_freeze(struct device *dev) { return 0; }
>  #if defined(CONFIG_ACPI) && defined(CONFIG_PM)
>  struct acpi_device *acpi_dev_pm_get_node(struct device *dev);
>  int acpi_dev_pm_attach(struct device *dev, bool power_on);
> -void acpi_dev_pm_detach(struct device *dev, bool power_off);
> +int acpi_dev_pm_detach(struct device *dev, bool power_off);
>  #else
>  static inline struct acpi_device *acpi_dev_pm_get_node(struct device *dev)
>  {
> @@ -597,7 +597,10 @@ static inline int acpi_dev_pm_attach(struct device *dev, bool power_on)
>  {
>  	return -ENODEV;
>  }
> -static inline void acpi_dev_pm_detach(struct device *dev, bool power_off) {}
> +static inline int acpi_dev_pm_detach(struct device *dev, bool power_off)
> +{
> +	return -ENODEV;
> +}
>  #endif
>  
>  #ifdef CONFIG_ACPI
> -- 
> 1.9.1

-- 
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