thermal: ACPI: Initialize trips if temperature is out of range

In some cases it is still useful to register a trip point if the
temperature returned by the corresponding ACPI thermal object (for
example, _HOT) is invalid to start with, because the same ACPI
thermal object may start to return a valid temperature after a
system configuration change (for example, from an AC power source
to battery an vice versa).

For this reason, if the ACPI thermal object evaluated by
thermal_acpi_trip_init() successfully returns a temperature value that
is out of the range of values taken into account, initialize the trip
point using THERMAL_TEMP_INVALID as the temperature value instead of
returning an error to allow the user of the trip point to decide what
to do with it.

Also update pch_wpt_add_acpi_psv_trip() to reject trip points with
invalid temperature values.

Fixes: 7a0e39748861 ("thermal: ACPI: Add ACPI trip point routines")
Reported-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

2 files changed, 5 insertions, 4 deletions

diff --git a/drivers/thermal/intel/intel_pch_thermal.c b/drivers/thermal/intel/intel_pch_thermal.c
index cc4e9d28496b..45a9ea86907e 100644
--- a/drivers/thermal/intel/intel_pch_thermal.c
+++ b/drivers/thermal/intel/intel_pch_thermal.c
@@ -107,7 +107,7 @@ static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
 		return;
 
 	ret = thermal_acpi_trip_passive(adev, &ptd->trips[*nr_trips]);
-	if (ret)
+	if (ret || ptd->trips[*nr_trips].temperature <= 0)
 		return;
 
 	++(*nr_trips);
diff --git a/drivers/thermal/thermal_acpi.c b/drivers/thermal/thermal_acpi.c
index f65281ca3ed0..671f774a7621 100644
--- a/drivers/thermal/thermal_acpi.c
+++ b/drivers/thermal/thermal_acpi.c
@@ -64,13 +64,14 @@ static int thermal_acpi_trip_init(struct acpi_device *adev,
 		return -ENODATA;
 	}
 
-	if (temp < TEMP_MIN_DECIK || temp >= TEMP_MAX_DECIK) {
+	if (temp >= TEMP_MIN_DECIK && temp <= TEMP_MAX_DECIK) {
+		trip->temperature = deci_kelvin_to_millicelsius(temp);
+	} else {
 		acpi_handle_debug(adev->handle, "%s result %llu out of range\n",
 				  obj_name, temp);
-		return -ENODATA;
+		trip->temperature = THERMAL_TEMP_INVALID;
 	}
 
-	trip->temperature = deci_kelvin_to_millicelsius(temp);
 	trip->hysteresis = 0;
 	trip->type = type;