PM / wakeup: Avoid excessive s2idle wake attempts in pm_system_wakeup()

Calling s2idle_wake() once after pm_abort_suspend is incremented is all
that's needed to wake up from s2idle. Avoid multiple unnecessary attempts
to wake from s2idle by only doing the wakeup when pm_abort_suspend hits 1.
The s2idle machinery already provides the synchronization needed to make
this safe.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
Change-Id: I789857351353737f7199a8df5c5ba210050352e6

drivers/base/power/wakeup.c

@@ -965,8 +965,8 @@ bool pm_wakeup_pending(void)
 
 void pm_system_wakeup(void)
 {
-	atomic_inc(&pm_abort_suspend);
-	s2idle_wake();
+	if (atomic_inc_return_relaxed(&pm_abort_suspend) == 1)
+		s2idle_wake();
 }
 EXPORT_SYMBOL_GPL(pm_system_wakeup);