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Commit 668e0200 authored by Lan Tianyu's avatar Lan Tianyu Committed by Rafael J. Wysocki
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ACPI / thermal: Add check of "_TZD" availability and evaluating result 



Some machines don't provide _TZD, so check the availability of it
before carrying out futher operations.

If _TZD is present, also check the result of its evaluation.

[rjw: Changelog]
Signed-off-by: default avatarLan Tianyu <tianyu.lan@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 7702ae0d

drivers/acpi/thermal.c

+6 −6
Original line number Diff line number Diff line
@@ -485,14 +485,14 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag) 
			break;

	}



	if (flag & ACPI_TRIPS_DEVICES) {

		memset(&devices, 0, sizeof(struct acpi_handle_list));

	if ((flag & ACPI_TRIPS_DEVICES)

	    && acpi_has_method(tz->device->handle, "_TZD")) {

		memset(&devices, 0, sizeof(devices));

		status = acpi_evaluate_reference(tz->device->handle, "_TZD",

						NULL, &devices);

		if (memcmp(&tz->devices, &devices,

				sizeof(struct acpi_handle_list))) {

			memcpy(&tz->devices, &devices,

				sizeof(struct acpi_handle_list));

		if (ACPI_SUCCESS(status)

		    && memcmp(&tz->devices, &devices, sizeof(devices))) {

			tz->devices = devices;

			ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");

		}

	}