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PM / sleep: Mark suspend/hibernation start and finish

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Regardless of whether or not debug messages from the core system
suspend/hibernation code are enabled, it is useful to know when
system-wide transitions start and finish (or fail), so print "info"
messages at these points.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Mark Salyzyn <salyzyn@android.com>
This commit is contained in:
Rafael J. Wysocki 2017-07-20 03:38:07 +02:00
parent 8d8b2441db
commit 8915aa2042
2 changed files with 7 additions and 0 deletions
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5
kernel/power/hibernate.c
View File

@ -692,6 +692,7 @@ int hibernate(void)
goto Unlock;
}
pr_info("hibernation entry\n");
pm_prepare_console();
error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
if (error) {
@ -762,6 +763,8 @@ int hibernate(void)
atomic_inc(&snapshot_device_available);
Unlock:
unlock_system_sleep();
pr_info("hibernation exit\n");
return error;
}
@ -868,6 +871,7 @@ static int software_resume(void)
goto Unlock;
}
pr_info("resume from hibernation\n");
pm_prepare_console();
error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls);
if (error) {
@ -884,6 +888,7 @@ static int software_resume(void)
Finish:
__pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
pm_restore_console();
pr_info("resume from hibernation failed (%d)\n", error);
atomic_inc(&snapshot_device_available);
/* For success case, the suspend path will release the lock */
Unlock:

2
kernel/power/suspend.c
View File

@ -584,6 +584,7 @@ int pm_suspend(suspend_state_t state)
if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX)
return -EINVAL;
pr_info("PM: suspend entry (%s)\n", pm_states[state]);
error = enter_state(state);
if (error) {
suspend_stats.fail++;
@ -591,6 +592,7 @@ int pm_suspend(suspend_state_t state)
} else {
suspend_stats.success++;
}
pr_info("PM: suspend exit\n");
return error;
}
EXPORT_SYMBOL(pm_suspend);