thermal fixup for broken BIOS which has invalid trip points.

ACPI thermal driver only re-evaluate VALID trip points.

For the broken BIOS show in
http://bugzilla.kernel.org/show_bug.cgi?id=8544
the active[0] is set to invalid at boot time
and it will not be re-evaluated again.
We can still get a single warning message at boot time.

http://marc.info/?l=linux-kernel&m=120496222629983&w=2

http://bugzilla.kernel.org/show_bug.cgi?id=12203

Signed-off-by: Zhang Rui<rui.zhang@intel.com>
Tested-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/thermal.c

@@ -416,7 +416,8 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 	}
 
 	/* Passive (optional) */
-	if (flag & ACPI_TRIPS_PASSIVE) {
+	if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
+		(flag == ACPI_TRIPS_INIT)) {
 		valid = tz->trips.passive.flags.valid;
 		if (psv == -1) {
 			status = AE_SUPPORT;
@@ -462,8 +463,11 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 		memset(&devices, 0, sizeof(struct acpi_handle_list));
 		status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 							NULL, &devices);
-		if (ACPI_FAILURE(status))
+		if (ACPI_FAILURE(status)) {
+			printk(KERN_WARNING PREFIX
+				"Invalid passive threshold\n");
 			tz->trips.passive.flags.valid = 0;
+		}
 		else
 			tz->trips.passive.flags.valid = 1;
 
@@ -487,7 +491,8 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 		if (act == -1)
 			break; /* disable all active trip points */
 
-		if (flag & ACPI_TRIPS_ACTIVE) {
+		if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
+			tz->trips.active[i].flags.valid)) {
 			status = acpi_evaluate_integer(tz->device->handle,
 							name, NULL, &tmp);
 			if (ACPI_FAILURE(status)) {
@@ -521,8 +526,11 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 			memset(&devices, 0, sizeof(struct acpi_handle_list));
 			status = acpi_evaluate_reference(tz->device->handle,
 						name, NULL, &devices);
-			if (ACPI_FAILURE(status))
+			if (ACPI_FAILURE(status)) {
+				printk(KERN_WARNING PREFIX
+					"Invalid active%d threshold\n", i);
 				tz->trips.active[i].flags.valid = 0;
+			}
 			else
 				tz->trips.active[i].flags.valid = 1;