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ACPI: Reject below-freezing temperatures as invalid critical temperatures

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My laptop thinks that it's a good idea to give -73C as the critical
CPU temperature.... which isn't the best thing since it causes a shutdown
right at bootup.

Temperatures below freezing are clearly invalid critical thresholds
so just reject these as such.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Arjan van de Ven 2008-05-19 15:55:15 -07:00 committed by Len Brown
parent 8410565f54
commit a39a2d7c72
1 changed files with 9 additions and 2 deletions
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11
drivers/acpi/thermal.c
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@ -364,10 +364,17 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
if (flag & ACPI_TRIPS_CRITICAL) {
status = acpi_evaluate_integer(tz->device->handle,
"_CRT", NULL, &tz->trips.critical.temperature);
if (ACPI_FAILURE(status)) {
/*
* Treat freezing temperatures as invalid as well; some
* BIOSes return really low values and cause reboots at startup.
* Below zero (Celcius) values clearly aren't right for sure..
* ... so lets discard those as invalid.
*/
if (ACPI_FAILURE(status) ||
tz->trips.critical.temperature <= 2732) {
tz->trips.critical.flags.valid = 0;
ACPI_EXCEPTION((AE_INFO, status,
"No critical threshold"));
"No or invalid critical threshold"));
return -ENODEV;
} else {
tz->trips.critical.flags.valid = 1;