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PM / sleep: Mechanism for aborting system suspends unconditionally

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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: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2014-09-01 13:47:49 +02:00
parent 69e273c0b0
commit 068765ba79
3 changed files with 20 additions and 1 deletions
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16
drivers/base/power/wakeup.c
View File

@ -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;
}
/**

4
include/linux/suspend.h
View File

@ -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) {}

1
kernel/power/process.c
View File

@ -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);