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

[Rafael J. Wysocki]

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

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@xxxxxxxxx>
---
 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