X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Facpi%2Fthermal.c;h=84c795fb9b1ebef3a787907ba372cc368923a6c2;hb=54364b752ef0c91fe92684df000cc4593d1e8963;hp=504385b1f2116614bd8e53e598b5c093414b2841;hpb=d626e3bf728c47746f2129aa00c775d4e8c2a73b;p=linux-2.6

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 504385b1f2..84c795fb9b 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)
 	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;