Merge branch 'thermal-core'

Merge thermal core fixes and cleanups for 6.12:

 - Refuse to accept trip point temperature or hysteresis that would lead
   to an invalid threshold value when setting them via sysfs (Rafael
   Wysocki).

 - Adjust states of all uninitialized instances in the .manage()
   callback of the Bang-bang thermal governor (Rafael Wysocki).

 - Drop a couple of redundant checks along with the code depending on
   them from the thermal core (Rafael Wysocki).

 - Rearrange the thermal core to avoid redundant checks and simplify
   control flow in a couple of code paths (Rafael Wysocki).

* thermal-core:
  thermal: core: Drop thermal_zone_device_is_enabled()
  thermal: core: Check passive delay in monitor_thermal_zone()
  thermal: core: Drop dead code from monitor_thermal_zone()
  thermal: core: Drop redundant lockdep_assert_held()
  thermal: gov_bang_bang: Adjust states of all uninitialized instances
  thermal: sysfs: Add sanity checks for trip temperature and hysteresis

Author: rafaeljw

drivers/thermal/gov_bang_bang.c

@@ -92,23 +92,21 @@ static void bang_bang_manage(struct thermal_zone_device *tz)
 
 	for_each_trip_desc(tz, td) {
 		const struct thermal_trip *trip = &td->trip;
+		bool turn_on;
 
-		if (tz->temperature >= td->threshold ||
-		    trip->temperature == THERMAL_TEMP_INVALID ||
+		if (trip->temperature == THERMAL_TEMP_INVALID ||
 		    trip->type == THERMAL_TRIP_CRITICAL ||
 		    trip->type == THERMAL_TRIP_HOT)
 			continue;
 
 		/*
-		 * If the initial cooling device state is "on", but the zone
-		 * temperature is not above the trip point, the core will not
-		 * call bang_bang_control() until the zone temperature reaches
-		 * the trip point temperature which may be never.  In those
-		 * cases, set the initial state of the cooling device to 0.
+		 * Adjust the target states for uninitialized thermal instances
+		 * to the thermal zone temperature and the trip point threshold.
 		 */
+		turn_on = tz->temperature >= td->threshold;
 		list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
 			if (!instance->initialized && instance->trip == trip)
-				bang_bang_set_instance_target(instance, 0);
+				bang_bang_set_instance_target(instance, turn_on);
 		}
 	}
 

drivers/thermal/thermal_core.c

@@ -323,11 +323,6 @@ static void thermal_zone_broken_disable(struct thermal_zone_device *tz)
 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 					    unsigned long delay)
 {
-	if (!delay) {
-		cancel_delayed_work(&tz->poll_queue);
-		return;
-	}
-
 	if (delay > HZ)
 		delay = round_jiffies_relative(delay);
 
@@ -364,9 +359,7 @@ static void thermal_zone_recheck(struct thermal_zone_device *tz, int error)
 
 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 {
-	if (tz->mode != THERMAL_DEVICE_ENABLED)
-		thermal_zone_device_set_polling(tz, 0);
-	else if (tz->passive > 0)
+	if (tz->passive > 0 && tz->passive_delay_jiffies)
 		thermal_zone_device_set_polling(tz, tz->passive_delay_jiffies);
 	else if (tz->polling_delay_jiffies)
 		thermal_zone_device_set_polling(tz, tz->polling_delay_jiffies);
@@ -554,10 +547,7 @@ void __thermal_zone_device_update(struct thermal_zone_device *tz,
 	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);
@@ -659,13 +649,6 @@ int thermal_zone_device_disable(struct thermal_zone_device *tz)
 }
 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);
@@ -891,8 +874,6 @@ static void thermal_unbind_cdev_from_trip(struct thermal_zone_device *tz,
 {
 	struct thermal_instance *pos, *next;
 
-	lockdep_assert_held(&tz->lock);
-
 	mutex_lock(&cdev->lock);
 	list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
 		if (pos->trip == trip && pos->cdev == cdev) {
@@ -1415,13 +1396,8 @@ thermal_zone_device_register_with_trips(const char *type,
 	if (num_trips > 0 && !trips)
 		return ERR_PTR(-EINVAL);
 
-	if (polling_delay) {
-		if (passive_delay > polling_delay)
-			return ERR_PTR(-EINVAL);
-
-		if (!passive_delay)
-			passive_delay = polling_delay;
-	}
+	if (polling_delay && passive_delay > polling_delay)
+		return ERR_PTR(-EINVAL);
 
 	if (!thermal_class)
 		return ERR_PTR(-ENODEV);

drivers/thermal/thermal_core.h

@@ -284,7 +284,4 @@ thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
 				    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__ */

drivers/thermal/thermal_sysfs.c

@@ -53,7 +53,7 @@ mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 	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");
@@ -111,18 +111,26 @@ trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 
 	mutex_lock(&tz->lock);
 
-	if (temp != trip->temperature) {
-		if (tz->ops.set_trip_temp) {
-			ret = tz->ops.set_trip_temp(tz, trip, temp);
-			if (ret)
-				goto unlock;
-		}
+	if (temp == trip->temperature)
+		goto unlock;
 
-		thermal_zone_set_trip_temp(tz, trip, temp);
+	/* Arrange the condition to avoid integer overflows. */
+	if (temp != THERMAL_TEMP_INVALID &&
+	    temp <= trip->hysteresis + THERMAL_TEMP_INVALID) {
+		ret = -EINVAL;
+		goto unlock;
+	}
 
-		__thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
+	if (tz->ops.set_trip_temp) {
+		ret = tz->ops.set_trip_temp(tz, trip, temp);
+		if (ret)
+			goto unlock;
 	}
 
+	thermal_zone_set_trip_temp(tz, trip, temp);
+
+	__thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
+
 unlock:
 	mutex_unlock(&tz->lock);
 
@@ -152,15 +160,33 @@ trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 
 	mutex_lock(&tz->lock);
 
-	if (hyst != trip->hysteresis) {
-		thermal_zone_set_trip_hyst(tz, trip, hyst);
+	if (hyst == trip->hysteresis)
+		goto unlock;
+
+	/*
+	 * Allow the hysteresis to be updated when the temperature is invalid
+	 * to allow user space to avoid having to adjust hysteresis after a
+	 * valid temperature has been set, but in that case just change the
+	 * value and do nothing else.
+	 */
+	if (trip->temperature == THERMAL_TEMP_INVALID) {
+		WRITE_ONCE(trip->hysteresis, hyst);
+		goto unlock;
+	}
 
-		__thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
+	if (trip->temperature - hyst <= THERMAL_TEMP_INVALID) {
+		ret = -EINVAL;
+		goto unlock;
 	}
 
+	thermal_zone_set_trip_hyst(tz, trip, hyst);
+
+	__thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
+
+unlock:
 	mutex_unlock(&tz->lock);
 
-	return count;
+	return ret ? ret : count;
 }
 
 static ssize_t