thermal/sysfs: Update governors when the 'weight' has changed

Support governors update when the thermal instance's weight has changed.
This allows to adjust internal state for the governor.
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
[ rjw: Add two empty code lines aroung the locking ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/thermal/thermal_sysfs.c

@@ -939,7 +939,12 @@ ssize_t weight_store(struct device *dev, struct device_attribute *attr,
 
 	/* Don't race with governors using the 'weight' value */
 	mutex_lock(&instance->tz->lock);
+
 	instance->weight = weight;
+
+	thermal_governor_update_tz(instance->tz,
+				   THERMAL_INSTANCE_WEIGHT_CHANGED);
+
 	mutex_unlock(&instance->tz->lock);
 
 	return count;

include/linux/thermal.h

@@ -53,6 +53,7 @@ enum thermal_notify_event {
 	THERMAL_EVENT_KEEP_ALIVE, /* Request for user space handler to respond */
 	THERMAL_TZ_BIND_CDEV, /* Cooling dev is bind to the thermal zone */
 	THERMAL_TZ_UNBIND_CDEV, /* Cooling dev is unbind from the thermal zone */
+	THERMAL_INSTANCE_WEIGHT_CHANGED, /* Thermal instance weight changed */
 };
 
 /**