linux-kernel - [RFC PATCH for 6.13 v1 07/20] thermal: core: Mark thermal zones as exiting before unregistration

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Message-ID: <1997536.PYKUYFuaPT@rjwysocki.net>
Date: Sat, 14 Sep 2024 12:34:06 +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 07/20] thermal: core: Mark thermal zones as exiting
 before unregistration

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

In analogy with a previous change in the thermal zone registration code
path, to ensure that __thermal_zone_device_update() will return early
for thermal zones that are going away, introduce a thermal zone state
flag representing the "exit" state and set it along with deleting the
thermal zone from thermal_tz_list.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/thermal/thermal_core.c |    5 +++--
 drivers/thermal/thermal_core.h |    1 +
 2 files changed, 4 insertions(+), 2 deletions(-)

Index: linux-pm/drivers/thermal/thermal_core.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.c
+++ linux-pm/drivers/thermal/thermal_core.c
@@ -1563,10 +1563,11 @@ struct device *thermal_zone_device(struc
 }
 EXPORT_SYMBOL_GPL(thermal_zone_device);

-static void thermal_zone_del_from_list(struct thermal_zone_device *tz)
+static void thermal_zone_exit(struct thermal_zone_device *tz)
 {
 	guard(thermal_zone)(tz);

+	tz->state |= TZ_STATE_FLAG_EXIT;
 	list_del(&tz->node);
 }

@@ -1594,7 +1595,7 @@ void thermal_zone_device_unregister(stru
 		return;
 	}

-	thermal_zone_del_from_list(tz);
+	thermal_zone_exit(tz);

 	/* Unbind all cdevs associated with 'this' thermal zone */
 	list_for_each_entry(cdev, &thermal_cdev_list, node)
Index: linux-pm/drivers/thermal/thermal_core.h
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.h
+++ linux-pm/drivers/thermal/thermal_core.h
@@ -65,6 +65,7 @@ struct thermal_governor {
 #define	TZ_STATE_FLAG_SUSPENDED	BIT(0)
 #define	TZ_STATE_FLAG_RESUMING	BIT(1)
 #define	TZ_STATE_FLAG_INIT	BIT(2)
+#define	TZ_STATE_FLAG_EXIT	BIT(3)

 #define TZ_STATE_READY		0