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PM / sleep: Check pm_wakeup_pending() in __device_suspend_noirq() 

Restore the pm_wakeup_pending() check in __device_suspend_noirq()
removed by commit eed4d47efe (ACPI / sleep: Ignore spurious SCI
wakeups from suspend-to-idle) as that allows the function to return
earlier if there's a wakeup event pending already (so that it may
spend less time on carrying out operations that will be reversed
shortly anyway) and rework the main suspend-to-idle loop to take
that optimization into account.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Rafael J. Wysocki 2017-07-21 02:12:10 +02:00
parent 48059c095b
commit 9a3ebe3523
2 changed files with 21 additions and 3 deletions
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5
drivers/base/power/main.c
View File

@ -1105,6 +1105,11 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a
if (async_error)
goto Complete;
if (pm_wakeup_pending()) {
async_error = -EBUSY;
goto Complete;
}
if (dev->power.syscore || dev->power.direct_complete)
goto Complete;

19
kernel/power/suspend.c
View File

@ -108,19 +108,32 @@ static void s2idle_loop(void)
{
pm_pr_dbg("suspend-to-idle\n");
while (!dpm_suspend_noirq(PMSG_SUSPEND)) {
for (;;) {
int error;
dpm_noirq_begin();
/*
* Suspend-to-idle equals
* frozen processes + suspended devices + idle processors.
* Thus freeze_enter() should be called right after
* all devices have been suspended.
*/
freeze_enter();
error = dpm_noirq_suspend_devices(PMSG_SUSPEND);
if (!error)
freeze_enter();
dpm_noirq_resume_devices(PMSG_RESUME);
if (error && (error != -EBUSY || !pm_wakeup_pending())) {
dpm_noirq_end();
break;
}
if (freeze_ops && freeze_ops->wake)
freeze_ops->wake();
dpm_resume_noirq(PMSG_RESUME);
dpm_noirq_end();
if (freeze_ops && freeze_ops->sync)
freeze_ops->sync();