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authorArjan van de Ven <arjan@linux.intel.com>2008-05-19 18:55:15 -0400
committerLen Brown <len.brown@intel.com>2008-06-11 19:13:47 -0400
commita39a2d7c72b358c6253a2ec28e17b023b7f6f41c (patch)
treee6ad8c035a0db797d748a3739385de14c9ed55f7 /drivers
parent8410565f540db87ca938f56f92780d251e4f157d (diff)
ACPI: Reject below-freezing temperatures as invalid critical temperatures
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/acpi/thermal.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 504385b1f211..84c795fb9b1e 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -364,10 +364,17 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
364 if (flag & ACPI_TRIPS_CRITICAL) { 364 if (flag & ACPI_TRIPS_CRITICAL) {
365 status = acpi_evaluate_integer(tz->device->handle, 365 status = acpi_evaluate_integer(tz->device->handle,
366 "_CRT", NULL, &tz->trips.critical.temperature); 366 "_CRT", NULL, &tz->trips.critical.temperature);
367 if (ACPI_FAILURE(status)) { 367 /*
368 * Treat freezing temperatures as invalid as well; some
369 * BIOSes return really low values and cause reboots at startup.
370 * Below zero (Celcius) values clearly aren't right for sure..
371 * ... so lets discard those as invalid.
372 */
373 if (ACPI_FAILURE(status) ||
374 tz->trips.critical.temperature <= 2732) {
368 tz->trips.critical.flags.valid = 0; 375 tz->trips.critical.flags.valid = 0;
369 ACPI_EXCEPTION((AE_INFO, status, 376 ACPI_EXCEPTION((AE_INFO, status,
370 "No critical threshold")); 377 "No or invalid critical threshold"));
371 return -ENODEV; 378 return -ENODEV;
372 } else { 379 } else {
373 tz->trips.critical.flags.valid = 1; 380 tz->trips.critical.flags.valid = 1;