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);