Commit 068765ba authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM / sleep: Mechanism for aborting system suspends unconditionally 



It sometimes may be necessary to abort a system suspend in
progress or wake up the system from suspend-to-idle even if the
pm_wakeup_event()/pm_stay_awake() mechanism is not enabled.

For this purpose, introduce a new global variable pm_abort_suspend
and make pm_wakeup_pending() check its value.  Also add routines
for manipulating that variable.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 69e273c0

drivers/base/power/wakeup.c

+15 −1
Original line number Diff line number Diff line
@@ -24,6 +24,9 @@ 
 */

bool events_check_enabled __read_mostly;



/* If set and the system is suspending, terminate the suspend. */

static bool pm_abort_suspend __read_mostly;



/*

 * Combined counters of registered wakeup events and wakeup events in progress.

 * They need to be modified together atomically, so it's better to use one
@@ -719,7 +722,18 @@ bool pm_wakeup_pending(void) 
		pm_print_active_wakeup_sources();

	}



	return ret;

	return ret || pm_abort_suspend;

}



void pm_system_wakeup(void)

{

	pm_abort_suspend = true;

	freeze_wake();

}



void pm_wakeup_clear(void)

{

	pm_abort_suspend = false;

}



/**

include/linux/suspend.h

+4 −0
Original line number Diff line number Diff line
@@ -371,6 +371,8 @@ extern int unregister_pm_notifier(struct notifier_block *nb); 
extern bool events_check_enabled;



extern bool pm_wakeup_pending(void);

extern void pm_system_wakeup(void);

extern void pm_wakeup_clear(void);

extern bool pm_get_wakeup_count(unsigned int *count, bool block);

extern bool pm_save_wakeup_count(unsigned int count);

extern void pm_wakep_autosleep_enabled(bool set);
@@ -418,6 +420,8 @@ static inline int unregister_pm_notifier(struct notifier_block *nb) 
#define pm_notifier(fn, pri)	do { (void)(fn); } while (0)



static inline bool pm_wakeup_pending(void) { return false; }

static inline void pm_system_wakeup(void) {}

static inline void pm_wakeup_clear(void) {}



static inline void lock_system_sleep(void) {}

static inline void unlock_system_sleep(void) {}

kernel/power/process.c

+1 −0
Original line number Diff line number Diff line
@@ -129,6 +129,7 @@ int freeze_processes(void) 
	if (!pm_freezing)

		atomic_inc(&system_freezing_cnt);



	pm_wakeup_clear();

	printk("Freezing user space processes ... ");

	pm_freezing = true;

	error = try_to_freeze_tasks(true);

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