thermal: intel: int340x: Add locking to int340x_thermal_get_trip_type()

[ 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@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c b/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
index 852f6c5..0a4eaa3 100644 (file)
--- 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,