thermal: core: Introduce thermal_instance_add()

To reduce the number of redundant result checks in
thermal_bind_cdev_to_trip() and make the code in it easier to
follow, move some of it to a new function called thermal_instance_add()
and make thermal_bind_cdev_to_trip() invoke that function.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/3618899.iIbC2pHGDl@rjwysocki.net
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index cc1fd230b1001922b91e50bb868ca920e7c92623..ae424eef45749fc8854058f53bc1faec21e3f532 100644 (file)
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -745,6 +745,28 @@ struct thermal_zone_device *thermal_zone_get_by_id(int id)
  *                                  binding, and unbinding.
  */
 
+static int thermal_instance_add(struct thermal_instance *new_instance,
+                               struct thermal_cooling_device *cdev,
+                               struct thermal_trip_desc *td)
+{
+       struct thermal_instance *instance;
+
+       list_for_each_entry(instance, &td->thermal_instances, trip_node) {
+               if (instance->cdev == cdev)
+                       return -EEXIST;
+       }
+
+       list_add_tail(&new_instance->trip_node, &td->thermal_instances);
+
+       mutex_lock(&cdev->lock);
+
+       list_add_tail(&new_instance->cdev_node, &cdev->thermal_instances);
+
+       mutex_unlock(&cdev->lock);
+
+       return 0;
+}
+
 /**
  * thermal_bind_cdev_to_trip - bind a cooling device to a thermal zone
  * @tz:                pointer to struct thermal_zone_device
@@ -763,7 +785,7 @@ static int thermal_bind_cdev_to_trip(struct thermal_zone_device *tz,
                                     struct thermal_cooling_device *cdev,
                                     struct cooling_spec *cool_spec)
 {
-       struct thermal_instance *dev, *instance;
+       struct thermal_instance *dev;
        bool upper_no_limit;
        int result;
 
@@ -825,23 +847,15 @@ static int thermal_bind_cdev_to_trip(struct thermal_zone_device *tz,
        if (result)
                goto remove_trip_file;
 
-       mutex_lock(&cdev->lock);
-       list_for_each_entry(instance, &td->thermal_instances, trip_node)
-               if (instance->cdev == cdev) {
-                       result = -EEXIST;
-                       break;
-               }
-       if (!result) {
-               list_add_tail(&dev->trip_node, &td->thermal_instances);
-               list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
-       }
-       mutex_unlock(&cdev->lock);
+       result = thermal_instance_add(dev, cdev, td);
+       if (result)
+               goto remove_weight_file;
 
-       if (!result) {
-               thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV);
-               return 0;
-       }
+       thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV);
+
+       return 0;
 
+remove_weight_file:
        device_remove_file(&tz->device, &dev->weight_attr);
 remove_trip_file:
        device_remove_file(&tz->device, &dev->attr);