1 files changed, 36 insertions, 7 deletions

diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index c347e3ce3a55..b7d6b3a721b1 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -37,7 +37,9 @@ const char *pm_states[PM_SUSPEND_MAX];
 static const struct platform_suspend_ops *suspend_ops;
 static const struct platform_freeze_ops *freeze_ops;
 static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head);
-static bool suspend_freeze_wake;
+
+enum freeze_state __read_mostly suspend_freeze_state;
+static DEFINE_SPINLOCK(suspend_freeze_lock);
 
 void freeze_set_ops(const struct platform_freeze_ops *ops)
 {
@@ -48,22 +50,49 @@ void freeze_set_ops(const struct platform_freeze_ops *ops)
 
 static void freeze_begin(void)
 {
-        suspend_freeze_wake = false;
+        suspend_freeze_state = FREEZE_STATE_NONE;
 }
 
 static void freeze_enter(void)
 {
-        cpuidle_use_deepest_state(true);
+        spin_lock_irq(&suspend_freeze_lock);
+        if (pm_wakeup_pending())
+                goto out;
+
+        suspend_freeze_state = FREEZE_STATE_ENTER;
+        spin_unlock_irq(&suspend_freeze_lock);
+
+        get_online_cpus();
         cpuidle_resume();
-        wait_event(suspend_freeze_wait_head, suspend_freeze_wake);
+
+        /* Push all the CPUs into the idle loop. */
+        wake_up_all_idle_cpus();
+        pr_debug("PM: suspend-to-idle\n");
+        /* Make the current CPU wait so it can enter the idle loop too. */
+        wait_event(suspend_freeze_wait_head,
+                   suspend_freeze_state == FREEZE_STATE_WAKE);
+        pr_debug("PM: resume from suspend-to-idle\n");
+
         cpuidle_pause();
-        cpuidle_use_deepest_state(false);
+        put_online_cpus();
+
+        spin_lock_irq(&suspend_freeze_lock);
+
+ out:
+        suspend_freeze_state = FREEZE_STATE_NONE;
+        spin_unlock_irq(&suspend_freeze_lock);
 }
 
 void freeze_wake(void)
 {
-        suspend_freeze_wake = true;
-        wake_up(&suspend_freeze_wait_head);
+        unsigned long flags;
+
+        spin_lock_irqsave(&suspend_freeze_lock, flags);
+        if (suspend_freeze_state > FREEZE_STATE_NONE) {
+                suspend_freeze_state = FREEZE_STATE_WAKE;
+                wake_up(&suspend_freeze_wait_head);
+        }
+        spin_unlock_irqrestore(&suspend_freeze_lock, flags);
 }
 EXPORT_SYMBOL_GPL(freeze_wake);