Thermal: do thermal zone update after a cooling device registered

[linux-block.git] / drivers / thermal / thermal_core.c

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 9aae767bf39bb8cfec030e319b0a861456a491f2..ba08b5521382890e66b14a54a5b67e7bc29c69fe 100644 (file)
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1341,6 +1341,7 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
        if (!result) {
                list_add_tail(&dev->tz_node, &tz->thermal_instances);
                list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
+               atomic_set(&tz->need_update, 1);
        }
        mutex_unlock(&cdev->lock);
        mutex_unlock(&tz->lock);
@@ -1450,6 +1451,7 @@ __thermal_cooling_device_register(struct device_node *np,
                                  const struct thermal_cooling_device_ops *ops)
 {
        struct thermal_cooling_device *cdev;
+       struct thermal_zone_device *pos = NULL;
        int result;
 
        if (type && strlen(type) >= THERMAL_NAME_LENGTH)
@@ -1494,6 +1496,12 @@ __thermal_cooling_device_register(struct device_node *np,
        /* Update binding information for 'this' new cdev */
        bind_cdev(cdev);
 
+       mutex_lock(&thermal_list_lock);
+       list_for_each_entry(pos, &thermal_tz_list, node)
+               if (atomic_cmpxchg(&pos->need_update, 1, 0))
+                       thermal_zone_device_update(pos);
+       mutex_unlock(&thermal_list_lock);
+
        return cdev;
 }
 
@@ -1826,6 +1834,8 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
        tz->trips = trips;
        tz->passive_delay = passive_delay;
        tz->polling_delay = polling_delay;
+       /* A new thermal zone needs to be updated anyway. */
+       atomic_set(&tz->need_update, 1);
 
        dev_set_name(&tz->device, "thermal_zone%d", tz->id);
        result = device_register(&tz->device);
@@ -1921,7 +1931,9 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
        INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
 
        thermal_zone_device_reset(tz);
-       thermal_zone_device_update(tz);
+       /* Update the new thermal zone and mark it as already updated. */
+       if (atomic_cmpxchg(&tz->need_update, 1, 0))
+               thermal_zone_device_update(tz);
 
        return tz;