From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date: Wed, 22 Apr 2026 15:39:19 +0000 (+0200)
Subject: thermal: core: Simplify unregistration of governors
X-Git-Tag: v7.2-rc1~209^2~1^2~12
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e12b7be7f051f639b79a8c449c81519c975cd50;p=thirdparty%2Fkernel%2Flinux.git

thermal: core: Simplify unregistration of governors

Thermal governors are only unregistered in the thermal_init() error
path and they actually are only deleted from thermal_governor_list.

Put the entire code needed to do that to thermal_unregister_governors()
and rearrange thermal_init() to call that function also when
thermal_register_governors() returns an error.

This allows thermal_unregister_governor() to be dropped
and thermal_register_governor() that is only called by
thermal_register_governors() can be made static __init, so the
headers of these two functions can be dropped from thermal_core.h.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/9615355.CDJkKcVGEf@rafael.j.wysocki
---

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 23d460a5da585..427a76223c6fe 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -116,14 +116,12 @@ static int thermal_set_governor(struct thermal_zone_device *tz,
 	return ret;
 }
 
-int thermal_register_governor(struct thermal_governor *governor)
+static int __init thermal_register_governor(struct thermal_governor *governor)
 {
 
 	if (!governor)
 		return -EINVAL;
 
-	guard(mutex)(&thermal_governor_lock);
-
 	if (__find_governor(governor->name))
 		return -EBUSY;
 
@@ -138,19 +136,6 @@ int thermal_register_governor(struct thermal_governor *governor)
 	return 0;
 }
 
-void thermal_unregister_governor(struct thermal_governor *governor)
-{
-	if (!governor)
-		return;
-
-	guard(mutex)(&thermal_governor_lock);
-
-	if (!__find_governor(governor->name))
-		return;
-
-	list_del(&governor->governor_list);
-}
-
 int thermal_zone_device_set_policy(struct thermal_zone_device *tz,
 				   char *policy)
 {
@@ -186,40 +171,34 @@ int thermal_build_list_of_policies(char *buf)
 
 static void __init thermal_unregister_governors(void)
 {
-	struct thermal_governor **governor;
+	struct thermal_governor *gov, *pos;
+
+	guard(mutex)(&thermal_governor_lock);
 
-	for_each_governor_table(governor)
-		thermal_unregister_governor(*governor);
+	list_for_each_entry_safe(gov, pos, &thermal_governor_list, governor_list)
+		list_del(&gov->governor_list);
 }
 
 static int __init thermal_register_governors(void)
 {
-	int ret = 0;
 	struct thermal_governor **governor;
 
+	guard(mutex)(&thermal_governor_lock);
+
 	for_each_governor_table(governor) {
+		int ret;
+
 		ret = thermal_register_governor(*governor);
 		if (ret) {
 			pr_err("Failed to register governor: '%s'",
 			       (*governor)->name);
-			break;
+			return ret;
 		}
 
-		pr_info("Registered thermal governor '%s'",
-			(*governor)->name);
+		pr_info("Registered thermal governor '%s'", (*governor)->name);
 	}
 
-	if (ret) {
-		struct thermal_governor **gov;
-
-		for_each_governor_table(gov) {
-			if (gov == governor)
-				break;
-			thermal_unregister_governor(*gov);
-		}
-	}
-
-	return ret;
+	return 0;
 }
 
 static int __thermal_zone_device_set_mode(struct thermal_zone_device *tz,
@@ -1858,7 +1837,7 @@ static int __init thermal_init(void)
 
 	result = thermal_register_governors();
 	if (result)
-		goto destroy_workqueue;
+		goto unregister_governors;
 
 	result = class_register(&thermal_class);
 	if (result)
@@ -1870,7 +1849,6 @@ static int __init thermal_init(void)
 
 unregister_governors:
 	thermal_unregister_governors();
-destroy_workqueue:
 	destroy_workqueue(thermal_wq);
 unregister_netlink:
 	thermal_netlink_exit();
diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
index d3acff602f9ce..0acb7d9587ca5 100644
--- a/drivers/thermal/thermal_core.h
+++ b/drivers/thermal/thermal_core.h
@@ -258,8 +258,6 @@ struct thermal_instance {
 #define to_cooling_device(_dev)	\
 	container_of(_dev, struct thermal_cooling_device, device)
 
-int thermal_register_governor(struct thermal_governor *);
-void thermal_unregister_governor(struct thermal_governor *);
 int thermal_zone_device_set_policy(struct thermal_zone_device *, char *);
 int thermal_build_list_of_policies(char *buf);
 void __thermal_zone_device_update(struct thermal_zone_device *tz,