linux-kernel - Re: [RFC][PATCH 2/3] PM / runtime: Routine for checking device status during system suspend

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Message-ID: <20140116133251.GC2494@intel.com>
Date:	Thu, 16 Jan 2014 15:32:51 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Aaron Lu <aaron.lu@...el.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 2/3] PM / runtime: Routine for checking device
 status during system suspend

On Wed, Jan 15, 2014 at 12:14:46AM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Add a new helper routine, pm_runtime_enabled_and_suspended(), to
> allow subsystems (or PM domains) to check the runtime PM status of
> devices during system suspend (possibly to avoid resuming those
> devices upfront at that time).
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>  drivers/base/power/runtime.c |   28 ++++++++++++++++++++++++++++
>  include/linux/pm_runtime.h   |    2 ++
>  2 files changed, 30 insertions(+)
> 
> Index: linux-pm/include/linux/pm_runtime.h
> ===================================================================
> --- linux-pm.orig/include/linux/pm_runtime.h
> +++ linux-pm/include/linux/pm_runtime.h
> @@ -53,6 +53,7 @@ extern unsigned long pm_runtime_autosusp
>  extern void pm_runtime_update_max_time_suspended(struct device *dev,
>  						 s64 delta_ns);
>  extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable);
> +extern bool pm_runtime_enabled_and_suspended(struct device *dev);
>  
>  static inline bool pm_children_suspended(struct device *dev)
>  {
> @@ -161,6 +162,7 @@ static inline unsigned long pm_runtime_a
>  				struct device *dev) { return 0; }
>  static inline void pm_runtime_set_memalloc_noio(struct device *dev,
>  						bool enable){}
> +static inline bool pm_runtime_enabled_and_suspended(struct device *dev) { return false };

The above probably doesn't compile if !CONFIG_PM_RUNTIME because of the
misplaced semicolon.
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