therm_est: skin sensor registration failure

NULL checks in therm_est_get_trend during
thermal_zone_of_sensor_register registration
of the skin virtual sensor.

Bug 1790948

Change-Id: I3c3a793b32e41ada5f4420829321ce0afc6d838b
Signed-off-by: Cyril Raju <craju@nvidia.com>
Reviewed-on: http://git-master/r/1185044

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/misc/therm_est.c b/drivers/misc/therm_est.c
index c192297d6..ed445d205 100644
--- a/drivers/misc/therm_est.c
+++ b/drivers/misc/therm_est.c
@@ -176,7 +176,9 @@ static int therm_est_get_trend(void *of_data, long *trend)
 {
         struct therm_estimator *est = (struct therm_estimator *)of_data;
 
-        if (est->thz->temperature > est->thz->last_temperature + 100)
+        if (IS_ERR_OR_NULL(est->thz))
+                *trend = THERMAL_TREND_STABLE;
+        else if (est->thz->temperature > est->thz->last_temperature + 100)
                 *trend = THERMAL_TREND_RAISING;
         else if (est->thz->temperature < est->thz->last_temperature - 100)
                 *trend = THERMAL_TREND_DROPPING;