linux-kernel - [PATCH v1 1/3] thermal/debugfs: Free all thermal zone debug memory on zone removal

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Date: Thu, 25 Apr 2024 15:49:04 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Lukasz Luba <lukasz.luba@....com>,
 Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Linux PM <linux-pm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>
Subject:
 [PATCH v1 1/3] thermal/debugfs: Free all thermal zone debug memory on zone
 removal

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

Because thermal_debug_tz_remove() does not free all memory allocated for
thermal zone diagnostics, some of that memory becomes unreachable after
freeing the thermal zone's struct thermal_debugfs object.

Address this by making thermal_debug_tz_remove() free all of the memory
in question.

Fixes: 7ef01f228c9f ("thermal/debugfs: Add thermal debugfs information for mitigation episodes")
Cc :6.8+ <stable@...r.kernel.org> # 6.8+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/thermal/thermal_debugfs.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

Index: linux-pm/drivers/thermal/thermal_debugfs.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_debugfs.c
+++ linux-pm/drivers/thermal/thermal_debugfs.c
@@ -832,15 +832,28 @@ void thermal_debug_tz_add(struct thermal
 void thermal_debug_tz_remove(struct thermal_zone_device *tz)
 {
 	struct thermal_debugfs *thermal_dbg = tz->debugfs;
+	struct tz_episode *tze, *tmp;
+	struct tz_debugfs *tz_dbg;
+	int *trips_crossed;

 	if (!thermal_dbg)
 		return;

+	tz_dbg = &thermal_dbg->tz_dbg;
+
 	mutex_lock(&thermal_dbg->lock);

+	trips_crossed = tz_dbg->trips_crossed;
+
+	list_for_each_entry_safe(tze, tmp, &tz_dbg->tz_episodes, node) {
+		list_del(&tze->node);
+		kfree(tze);
+	}
+
 	tz->debugfs = NULL;

 	mutex_unlock(&thermal_dbg->lock);

 	thermal_debugfs_remove_id(thermal_dbg);
+	kfree(trips_crossed);
 }