thermal: disable polling if passive_delay and polling_delay are both unset

Otherwise polling will continue for the thermal zone even when
it is no longer needed, for example because forced passive cooling
was disabled.

Signed-off-by: Frans Pop <elendil@planet.nl>
Acked-by: Matthew Garrett <mjg@redhat.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 663c2fdba775..3bc72ea57e09 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -1019,6 +1019,8 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
                 thermal_zone_device_set_polling(tz, tz->passive_delay);
         else if (tz->polling_delay)
                 thermal_zone_device_set_polling(tz, tz->polling_delay);
+        else
+                thermal_zone_device_set_polling(tz, 0);
         mutex_unlock(&tz->lock);
 }
 EXPORT_SYMBOL(thermal_zone_device_update);