linux-kernel - [RFC PATCH for 6.13 v1 19/20] thermal: core: Separate thermal zone governor initialization

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Message-ID: <2495577.jE0xQCEvom@rjwysocki.net>
Date: Sat, 14 Sep 2024 12:49:17 +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 19/20] thermal: core: Separate thermal zone governor
 initialization

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

In preparation for a subsequent change that will switch over the thermal
core to using a mutex guard for managing thermal_governor_lock, move
the code running in thermal_zone_device_register_with_trips() under that
lock into a separate function called thermal_zone_init_governor().

While at it, drop a useless comment.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/thermal/thermal_core.c |   36 +++++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 15 deletions(-)

Index: linux-pm/drivers/thermal/thermal_core.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.c
+++ linux-pm/drivers/thermal/thermal_core.c
@@ -1342,6 +1342,25 @@ int thermal_zone_get_crit_temp(struct th
 }
 EXPORT_SYMBOL_GPL(thermal_zone_get_crit_temp);

+static int thermal_zone_init_governor(struct thermal_zone_device *tz)
+{
+	struct thermal_governor *governor;
+	int ret;
+
+	mutex_lock(&thermal_governor_lock);
+
+	if (tz->tzp)
+		governor = __find_governor(tz->tzp->governor_name);
+	else
+		governor = def_governor;
+
+	ret = thermal_set_governor(tz, governor);
+
+	mutex_unlock(&thermal_governor_lock);
+
+	return ret;
+}
+
 static void thermal_zone_init_complete(struct thermal_zone_device *tz)
 {
 	struct thermal_cooling_device *cdev;
@@ -1406,7 +1425,6 @@ thermal_zone_device_register_with_trips(
 	struct thermal_trip_desc *td;
 	int id;
 	int result;
-	struct thermal_governor *governor;

 	if (!type || strlen(type) == 0) {
 		pr_err("No thermal zone type defined\n");
@@ -1502,21 +1520,9 @@ thermal_zone_device_register_with_trips(
 	if (result)
 		goto release_device;

-	/* Update 'this' zone's governor information */
-	mutex_lock(&thermal_governor_lock);
-
-	if (tz->tzp)
-		governor = __find_governor(tz->tzp->governor_name);
-	else
-		governor = def_governor;
-
-	result = thermal_set_governor(tz, governor);
-	if (result) {
-		mutex_unlock(&thermal_governor_lock);
+	result = thermal_zone_init_governor(tz);
+	if (result)
 		goto unregister;
-	}
-
-	mutex_unlock(&thermal_governor_lock);

 	if (!tz->tzp || !tz->tzp->no_hwmon) {
 		result = thermal_add_hwmon_sysfs(tz);