[thermal: thermal/next] thermal/core/thermal_of: Stop zone device before unregistering it

["thermal-bot for Dmitry Osipenko" <tip-bot2@linutronix.de>]

The following commit has been merged into the thermal/next branch of thermal:

Commit-ID:     5e5c9f9a75fc4532980c2e699caf8a36070a3a2e
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux.git//5e5c9f9a75fc4532980c2e699caf8a36070a3a2e
Author:        Dmitry Osipenko <digetx@gmail.com>
AuthorDate:    Wed, 16 Jun 2021 22:04:13 +03:00
Committer:     Daniel Lezcano <daniel.lezcano@linaro.org>
CommitterDate: Sun, 04 Jul 2021 18:28:04 +02:00

thermal/core/thermal_of: Stop zone device before unregistering it

Zone device is enabled after thermal_zone_of_sensor_register() completion,
but it's not disabled before senor is unregistered, leaving temperature
polling active. This results in accessing a disabled zone device and
produces a warning about this problem. Stop zone device before
unregistering it in order to fix this "use-after-free" problem.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210616190417.32214-3-digetx@gmail.com
---
 drivers/thermal/thermal_of.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 5b76f9a..6379f26 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -559,6 +559,9 @@ void thermal_zone_of_sensor_unregister(struct device *dev,
 	if (!tz)
 		return;
 
+	/* stop temperature polling */
+	thermal_zone_device_disable(tzd);
+
 	mutex_lock(&tzd->lock);
 	tzd->ops->get_temp = NULL;
 	tzd->ops->get_trend = NULL;