linux-kernel - [PATCH v2 07/12] thermal: core: Mark thermal zones as exiting before unregistration

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Message-ID: <4394176.ejJDZkT8p0@rjwysocki.net>
Date: Fri, 04 Oct 2024 21:26:12 +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>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject:
 [PATCH v2 07/12] 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 while deleting the thermal
zone from thermal_tz_list.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

This is a new iteration of

https://lore.kernel.org/linux-pm/1997536.PYKUYFuaPT@rjwysocki.net/

v1 -> v2: Rebase.

---
 drivers/thermal/thermal_core.c |    3 +++
 drivers/thermal/thermal_core.h |    1 +
 2 files changed, 4 insertions(+)

Index: linux-pm/drivers/thermal/thermal_core.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.c
+++ linux-pm/drivers/thermal/thermal_core.c
@@ -1613,7 +1613,10 @@ void thermal_zone_device_unregister(stru
 	}

 	mutex_lock(&tz->lock);
+
+	tz->state |= TZ_STATE_FLAG_EXIT;
 	list_del(&tz->node);
+
 	mutex_unlock(&tz->lock);

 	/* Unbind all cdevs associated with 'this' thermal zone */
Index: linux-pm/drivers/thermal/thermal_core.h
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.h
+++ linux-pm/drivers/thermal/thermal_core.h
@@ -64,6 +64,7 @@ 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