linux-kernel - [PATCH v1 4/4] thermal: core: Drop thermal_zone_device_is

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <9353673.CDJkKcVGEf@rjwysocki.net>
Date: Mon, 26 Aug 2024 18:37:16 +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>,
 Huisong Li <lihuisong@...wei.com>
Subject: [PATCH v1 4/4] thermal: core: Drop thermal_zone_device_is_enabled()

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

There are only two callers of thermal_zone_device_is_enabled()
and one of them call is under the zone lock and the other one uses
lockdep_assert_held() on that lock.  Thus the lockdep_assert_held()
in thermal_zone_device_is_enabled() is redundant and it could be
dropped, but then the function would merely become a wrapper around
a simple tz->mode check that is more convenient to do directly.

Accordingly, drop thermal_zone_device_is_enabled() altogether and update
its callers to check tz->mode directly as appropriate.

While at it, combine the tz->mode and tz->suspended checks in
__thermal_zone_device_update() because they are of a similar category
and if any of them evaluates to "true", the outcome is the same.

No intentinal functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/thermal/thermal_core.c  |   12 +-----------
 drivers/thermal/thermal_core.h  |    3 ---
 drivers/thermal/thermal_sysfs.c |    2 +-
 3 files changed, 2 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
@@ -547,10 +547,7 @@ void __thermal_zone_device_update(struct
 	int low = -INT_MAX, high = INT_MAX;
 	int temp, ret;

-	if (tz->suspended)
-		return;
-
-	if (!thermal_zone_device_is_enabled(tz))
+	if (tz->suspended || tz->mode != THERMAL_DEVICE_ENABLED)
 		return;

 	ret = __thermal_zone_get_temp(tz, &temp);
@@ -652,13 +649,6 @@ int thermal_zone_device_disable(struct t
 }
 EXPORT_SYMBOL_GPL(thermal_zone_device_disable);

-int thermal_zone_device_is_enabled(struct thermal_zone_device *tz)
-{
-	lockdep_assert_held(&tz->lock);
-
-	return tz->mode == THERMAL_DEVICE_ENABLED;
-}
-
 static bool thermal_zone_is_present(struct thermal_zone_device *tz)
 {
 	return !list_empty(&tz->node);
Index: linux-pm/drivers/thermal/thermal_core.h
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.h
+++ linux-pm/drivers/thermal/thermal_core.h
@@ -284,7 +284,4 @@ thermal_cooling_device_stats_update(stru
 				    unsigned long new_state) {}
 #endif /* CONFIG_THERMAL_STATISTICS */

-/* device tree support */
-int thermal_zone_device_is_enabled(struct thermal_zone_device *tz);
-
 #endif /* __THERMAL_CORE_H__ */
Index: linux-pm/drivers/thermal/thermal_sysfs.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_sysfs.c
+++ linux-pm/drivers/thermal/thermal_sysfs.c
@@ -53,7 +53,7 @@ mode_show(struct device *dev, struct dev
 	int enabled;

 	mutex_lock(&tz->lock);
-	enabled = thermal_zone_device_is_enabled(tz);
+	enabled = tz->mode == THERMAL_DEVICE_ENABLED;
 	mutex_unlock(&tz->lock);

 	return sprintf(buf, "%s\n", enabled ? "enabled" : "disabled");