From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
[ Upstream commit acd7e9ee57c880b99671dd99680cb707b7b5b0ee ]
In order to prevent int340x_thermal_get_trip_type() from possibly
racing with int340x_thermal_read_trips() invoked by int3403_notify()
add locking to it in analogy with int340x_thermal_get_trip_temp().
Fixes: 6757a7abe47b ("thermal: intel: int340x: Protect trip temperature from concurrent updates")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
.../intel/int340x_thermal/int340x_thermal_zone.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c b/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
index 852f6c579af5..0a4eaa307156 100644
--- a/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
+++ b/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
@@ -81,11 +81,13 @@ static int int340x_thermal_get_trip_type(struct thermal_zone_device *zone,
enum thermal_trip_type *type)
{
struct int34x_thermal_zone *d = zone->devdata;
- int i;
+ int i, ret = 0;
if (d->override_ops && d->override_ops->get_trip_type)
return d->override_ops->get_trip_type(zone, trip, type);
+ mutex_lock(&d->trip_mutex);
+
if (trip < d->aux_trip_nr)
*type = THERMAL_TRIP_PASSIVE;
else if (trip == d->crt_trip_id)
@@ -103,10 +105,12 @@ static int int340x_thermal_get_trip_type(struct thermal_zone_device *zone,
}
}
if (i == INT340X_THERMAL_MAX_ACT_TRIP_COUNT)
- return -EINVAL;
+ ret = -EINVAL;
}
- return 0;
+ mutex_unlock(&d->trip_mutex);
+
+ return ret;
}
static int int340x_thermal_set_trip_temp(struct thermal_zone_device *zone,
--
2.39.0
