---

yaml
---
r: 79698
b: refs/heads/master
c: 1a0c009
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4713e22ce81eb8b3353e16435362eb3d0ec95640
+refs/heads/master: 1a0c009ac53de4a7664a1239936f0bc258133156

trunk/arch/x86/kernel/i8253.c

@@ -18,6 +18,12 @@
 DEFINE_SPINLOCK(i8253_lock);
 EXPORT_SYMBOL(i8253_lock);
 
+#ifdef CONFIG_X86_32
+static void pit_disable_clocksource(void);
+#else
+static inline void pit_disable_clocksource(void) { }
+#endif
+
 /*
  * HPET replaces the PIT, when enabled. So we need to know, which of
  * the two timers is used
@@ -52,11 +58,13 @@ static void init_pit_timer(enum clock_event_mode mode,
 			outb_p(0, PIT_CH0);
 			outb_p(0, PIT_CH0);
 		}
+		pit_disable_clocksource();
 		break;
 
 	case CLOCK_EVT_MODE_ONESHOT:
 		/* One shot setup */
 		outb_p(0x38, PIT_MODE);
+		pit_disable_clocksource();
 		break;
 
 	case CLOCK_EVT_MODE_RESUME:
@@ -196,6 +204,17 @@ static struct clocksource clocksource_pit = {
 	.shift	= 20,
 };
 
+static void pit_disable_clocksource(void)
+{
+	/*
+	 * Use mult to check whether it is registered or not
+	 */
+	if (clocksource_pit.mult) {
+		clocksource_unregister(&clocksource_pit);
+		clocksource_pit.mult = 0;
+	}
+}
+
 static int __init init_pit_clocksource(void)
 {
 	 /*