linux-kernel - [RFC PATCH for 6.13 v1 16/20] thermal: core: Introduce thermal_cdev_update

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Message-ID: <3791590.MHq7AAxBmi@rjwysocki.net>
Date: Sat, 14 Sep 2024 12:45:57 +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 16/20] thermal: core: Introduce
 thermal_cdev_update_nocheck()

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

Three thermal governors call __thermal_cdev_update() under the
cdev lock without doing any checks, so in order to reduce the
related code duplication, introduce a new helper function called
thermal_cdev_update_nocheck() for them and make them use it.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/thermal/gov_bang_bang.c       |    4 +---
 drivers/thermal/gov_fair_share.c      |    4 +---
 drivers/thermal/gov_power_allocator.c |    5 ++---
 drivers/thermal/thermal_core.h        |    1 +
 drivers/thermal/thermal_helpers.c     |   13 +++++++++++++
 5 files changed, 18 insertions(+), 9 deletions(-)

Index: linux-pm/drivers/thermal/gov_bang_bang.c
===================================================================
--- linux-pm.orig/drivers/thermal/gov_bang_bang.c
+++ linux-pm/drivers/thermal/gov_bang_bang.c
@@ -30,9 +30,7 @@ static void bang_bang_set_instance_targe
 
 	dev_dbg(&instance->cdev->device, "target=%ld\n", instance->target);
 
-	mutex_lock(&instance->cdev->lock);
-	__thermal_cdev_update(instance->cdev);
-	mutex_unlock(&instance->cdev->lock);
+	thermal_cdev_update_nocheck(instance->cdev);
 }
 
 /**
Index: linux-pm/drivers/thermal/gov_fair_share.c
===================================================================
--- linux-pm.orig/drivers/thermal/gov_fair_share.c
+++ linux-pm/drivers/thermal/gov_fair_share.c
@@ -89,9 +89,7 @@ static void fair_share_throttle(struct t
 		}
 		instance->target = div_u64(dividend, divisor);
 
-		mutex_lock(&cdev->lock);
-		__thermal_cdev_update(cdev);
-		mutex_unlock(&cdev->lock);
+		thermal_cdev_update_nocheck(cdev);
 	}
 }
 
Index: linux-pm/drivers/thermal/gov_power_allocator.c
===================================================================
--- linux-pm.orig/drivers/thermal/gov_power_allocator.c
+++ linux-pm/drivers/thermal/gov_power_allocator.c
@@ -317,9 +317,8 @@ power_actor_set_power(struct thermal_coo
 		return ret;
 
 	instance->target = clamp_val(state, instance->lower, instance->upper);
-	mutex_lock(&cdev->lock);
-	__thermal_cdev_update(cdev);
-	mutex_unlock(&cdev->lock);
+
+	thermal_cdev_update_nocheck(cdev);
 
 	return 0;
 }
Index: linux-pm/drivers/thermal/thermal_core.h
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.h
+++ linux-pm/drivers/thermal/thermal_core.h
@@ -212,6 +212,7 @@ static inline bool cdev_is_power_actor(s
 }
 
 void thermal_cdev_update(struct thermal_cooling_device *);
+void thermal_cdev_update_nocheck(struct thermal_cooling_device *cdev);
 void __thermal_cdev_update(struct thermal_cooling_device *cdev);
 
 int get_tz_trend(struct thermal_zone_device *tz, const struct thermal_trip *trip);
Index: linux-pm/drivers/thermal/thermal_helpers.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_helpers.c
+++ linux-pm/drivers/thermal/thermal_helpers.c
@@ -206,6 +206,19 @@ void thermal_cdev_update(struct thermal_
 }
 
 /**
+ * thermal_cdev_update_nocheck() - Unconditionally update cooling device state
+ * @cdev: Target cooling device.
+ */
+void thermal_cdev_update_nocheck(struct thermal_cooling_device *cdev)
+{
+	mutex_lock(&cdev->lock);
+
+	__thermal_cdev_update(cdev);
+
+	mutex_unlock(&cdev->lock);
+}
+
+/**
  * thermal_zone_get_slope - return the slope attribute of the thermal zone
  * @tz: thermal zone device with the slope attribute
  *