1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index 37d73024b82e..e20708f2b8e5 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -215,8 +215,15 @@ static int power_saving_thread(void *data)
 		 * borrow CPU time from this CPU and cause RT task use > 95%
 		 * CPU time. To make 'avoid starvation' work, takes a nap here.
 		 */
-		if (do_sleep)
+		if (unlikely(do_sleep))
 			schedule_timeout_killable(HZ * idle_pct / 100);
+
+		/* If an external event has set the need_resched flag, then
+		 * we need to deal with it, or this loop will continue to
+		 * spin without calling __mwait().
+		 */
+		if (unlikely(need_resched()))
+			schedule();
 	}
 
 	exit_round_robin(tsk_index);