linux-kernel - [RFC PATCH for 6.13 v1 14/20] thermal: core: Introduce thermal_instance

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Message-ID: <2641944.Lt9SDvczpP@rjwysocki.net>
Date: Sat, 14 Sep 2024 12:43:24 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Lukasz Luba <lukasz.luba@....com>, Zhang Rui <rui.zhang@...el.com>
Subject:
 [RFC PATCH for 6.13 v1 14/20] thermal: core: Introduce thermal_instance_add()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

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 that code 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@...el.com>
---
 drivers/thermal/thermal_core.c |   46 ++++++++++++++++++++++++++---------------
 1 file changed, 30 insertions(+), 16 deletions(-)

Index: linux-pm/drivers/thermal/thermal_core.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.c
+++ linux-pm/drivers/thermal/thermal_core.c
@@ -736,6 +736,28 @@ struct thermal_zone_device *thermal_zone
  *				     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
@@ -754,7 +776,7 @@ static int thermal_bind_cdev_to_trip(str
 				     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;
 
@@ -816,23 +838,15 @@ static int thermal_bind_cdev_to_trip(str
 	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);