thermal: rcar: rcar_thermal_get_temp() return error if strange temp

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index fb81fd7e6b81..44b9c485157d 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -203,6 +203,7 @@ err_out_unlock:
 static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp)
 {
         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
+        int tmp;
         int ret;
 
         ret = rcar_thermal_update_temp(priv);
@@ -210,9 +211,18 @@ static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp)
                 return ret;
 
         mutex_lock(&priv->lock);
-        *temp =  MCELSIUS((priv->ctemp * 5) - 65);
+        tmp =  MCELSIUS((priv->ctemp * 5) - 65);
         mutex_unlock(&priv->lock);
 
+        if ((tmp < MCELSIUS(-45)) || (tmp > MCELSIUS(125))) {
+                struct device *dev = rcar_priv_to_dev(priv);
+
+                dev_err(dev, "it couldn't measure temperature correctly\n");
+                return -EIO;
+        }
+
+        *temp = tmp;
+
         return 0;
 }