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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: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lan Tianyu 2013-08-27 16:29:31 +08:00 committed by Rafael J. Wysocki
parent 7702ae0dd9
commit 668e020044
1 changed files with 6 additions and 6 deletions
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12
drivers/acpi/thermal.c
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@ -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");
}
}