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-rw-r--r--drivers/thermal/gov_bang_bang.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/thermal/gov_bang_bang.c b/drivers/thermal/gov_bang_bang.c
index 70836c5b89bc..fc52016d4e85 100644
--- a/drivers/thermal/gov_bang_bang.c
+++ b/drivers/thermal/gov_bang_bang.c
@@ -29,7 +29,13 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
struct thermal_instance *instance;
tz->ops->get_trip_temp(tz, trip, &trip_temp);
- tz->ops->get_trip_hyst(tz, trip, &trip_hyst);
+
+ if (!tz->ops->get_trip_hyst) {
+ pr_warn_once("Undefined get_trip_hyst for thermal zone %s - "
+ "running with default hysteresis zero\n", tz->type);
+ trip_hyst = 0;
+ } else
+ tz->ops->get_trip_hyst(tz, trip, &trip_hyst);
dev_dbg(&tz->device, "Trip%d[temp=%d]:temp=%d:hyst=%d\n",
trip, trip_temp, tz->temperature,