---

yaml
---
r: 14937
b: refs/heads/master
c: 2a298a3
h: refs/heads/master
i:
  14935: 4f8a571
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: deda498710e190c7922c2634ed630ee64ce86c05
+refs/heads/master: 2a298a35ebe060a6f2b06b20c2a34ea188ddfd37

trunk/drivers/acpi/processor_idle.c

@@ -169,15 +169,11 @@ acpi_processor_power_activate(struct acpi_processor *pr,
 
 static void acpi_safe_halt(void)
 {
-	int polling = test_thread_flag(TIF_POLLING_NRFLAG);
-	if (polling) {
-		clear_thread_flag(TIF_POLLING_NRFLAG);
-		smp_mb__after_clear_bit();
-	}
+	clear_thread_flag(TIF_POLLING_NRFLAG);
+	smp_mb__after_clear_bit();
 	if (!need_resched())
 		safe_halt();
-	if (polling)
-		set_thread_flag(TIF_POLLING_NRFLAG);
+	set_thread_flag(TIF_POLLING_NRFLAG);
 }
 
 static atomic_t c3_cpu_count;
@@ -295,6 +291,15 @@ static void acpi_processor_idle(void)
 	 * ------
 	 * Invoke the current Cx state to put the processor to sleep.
 	 */
+	if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) {
+		clear_thread_flag(TIF_POLLING_NRFLAG);
+		smp_mb__after_clear_bit();
+		if (need_resched()) {
+			set_thread_flag(TIF_POLLING_NRFLAG);
+			return;
+		}
+	}
+
 	switch (cx->type) {
 
 	case ACPI_STATE_C1:
@@ -327,6 +332,7 @@ static void acpi_processor_idle(void)
 		t2 = inl(acpi_fadt.xpm_tmr_blk.address);
 		/* Re-enable interrupts */
 		local_irq_enable();
+		set_thread_flag(TIF_POLLING_NRFLAG);
 		/* Compute time (ticks) that we were actually asleep */
 		sleep_ticks =
 		    ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD;
@@ -366,6 +372,7 @@ static void acpi_processor_idle(void)
 
 		/* Re-enable interrupts */
 		local_irq_enable();
+		set_thread_flag(TIF_POLLING_NRFLAG);
 		/* Compute time (ticks) that we were actually asleep */
 		sleep_ticks =
 		    ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD;