thermal/drivers/qcom: Fix set_trip_temp() deadlock

The set_trip_temp() callback is used when changing the trip temperature
through sysfs. As it is called with the thermal-zone-device lock held
it must not use thermal_zone_get_trip() directly or it will deadlock.

Fixes: 78c3e24 ("thermal/drivers/qcom: Use generic thermal_zone_get_trip() function")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20221214131617.2447-2-johan+linaro@kernel.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>

Author: jhovold

drivers/thermal/qcom/qcom-spmi-temp-alarm.c

@@ -270,7 +270,7 @@ static int qpnp_tm_set_trip_temp(struct thermal_zone_device *tz, int trip_id, in
 	struct thermal_trip trip;
 	int ret;
 
-	ret = thermal_zone_get_trip(chip->tz_dev, trip_id, &trip);
+	ret = __thermal_zone_get_trip(chip->tz_dev, trip_id, &trip);
 	if (ret)
 		return ret;
 

drivers/thermal/thermal_core.c

@@ -1214,6 +1214,7 @@ int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
 
 	return tz->ops->get_trip_type(tz, trip_id, &trip->type);
 }
+EXPORT_SYMBOL_GPL(__thermal_zone_get_trip);
 
 int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
 			  struct thermal_trip *trip)

include/linux/thermal.h

@@ -334,6 +334,8 @@ static inline void devm_thermal_of_zone_unregister(struct device *dev,
 }
 #endif
 
+int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
+			    struct thermal_trip *trip);
 int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
 			  struct thermal_trip *trip);