ACPI: Reject below-freezing temperatures as invalid critical temperatures (a39a2d7c) · Commits · 戴 / test

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>

drivers/acpi/thermal.c

+9 −2

Original line number	Diff line number	Diff line
		@@ -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;

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