linux-kernel - [PATCH v1 04/17] thermal: core: Clean up cdev binding/unbinding functions

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Message-ID: <3324744.oiGErgHkdL@rjwysocki.net>
Date: Tue, 30 Jul 2024 20:20:12 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Linux ACPI <linux-acpi@...r.kernel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Lukasz Luba <lukasz.luba@....com>, Zhang Rui <rui.zhang@...el.com>
Subject:
 [PATCH v1 04/17] thermal: core: Clean up cdev binding/unbinding functions

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

Add a new label to thermal_bind_cdev_to_trip() and use it to eliminate
two redundant !result check from that function, rename a label in
thermal_unbind_cdev_from_trip() to reflect its actual purpose and
adjust some white space in these functions.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/thermal/thermal_core.c |   32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

Index: linux-pm/drivers/thermal/thermal_core.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.c
+++ linux-pm/drivers/thermal/thermal_core.c
@@ -806,6 +806,7 @@ int thermal_bind_cdev_to_trip(struct the
 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		return -ENOMEM;
+
 	dev->tz = tz;
 	dev->cdev = cdev;
 	dev->trip = trip;
@@ -821,8 +822,7 @@ int thermal_bind_cdev_to_trip(struct the
 
 	dev->id = result;
 	sprintf(dev->name, "cdev%d", dev->id);
-	result =
-	    sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
+	result = sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 	if (result)
 		goto release_ida;
 
@@ -849,24 +849,26 @@ int thermal_bind_cdev_to_trip(struct the
 
 	mutex_lock(&tz->lock);
 	mutex_lock(&cdev->lock);
-	list_for_each_entry(pos, &tz->thermal_instances, tz_node)
+
+	list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 		if (pos->trip == trip && pos->cdev == cdev) {
 			result = -EEXIST;
-			break;
+			goto remove_weight_file;
 		}
-	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);
-
-		thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV);
 	}
+
+	list_add_tail(&dev->tz_node, &tz->thermal_instances);
+	list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
+	atomic_set(&tz->need_update, 1);
+
+	thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV);
+
 	mutex_unlock(&cdev->lock);
 	mutex_unlock(&tz->lock);
 
-	if (!result)
-		return 0;
+	return 0;
 
+remove_weight_file:
 	device_remove_file(&tz->device, &dev->weight_attr);
 remove_trip_file:
 	device_remove_file(&tz->device, &dev->attr);
@@ -914,6 +916,7 @@ int thermal_unbind_cdev_from_trip(struct
 
 	mutex_lock(&tz->lock);
 	mutex_lock(&cdev->lock);
+
 	list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
 		if (pos->trip == trip && pos->cdev == cdev) {
 			list_del(&pos->tz_node);
@@ -923,15 +926,16 @@ int thermal_unbind_cdev_from_trip(struct
 
 			mutex_unlock(&cdev->lock);
 			mutex_unlock(&tz->lock);
-			goto unbind;
+			goto free;
 		}
 	}
+
 	mutex_unlock(&cdev->lock);
 	mutex_unlock(&tz->lock);
 
 	return -ENODEV;
 
-unbind:
+free:
 	device_remove_file(&tz->device, &pos->weight_attr);
 	device_remove_file(&tz->device, &pos->attr);
 	sysfs_remove_link(&tz->device.kobj, pos->name);