From 8b7ef6d8f16274da42344cd50746ddb1c93c25ea Mon Sep 17 00:00:00 2001 From: Thomas Renninger Date: Tue, 16 Feb 2010 22:55:51 +0100 Subject: [PATCH] ACPI thermal: Check for thermal zone requirement ACPI spec says (11.5 Thermal Zone Interface Requirements): A thermal zone must contain at least one trip point (critical, near critical, active, or passive) Check this once at init time. Signed-off-by: Thomas Renninger Tested-by: clarkt@cnsp.com Signed-off-by: Len Brown --- drivers/acpi/thermal.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c index 9073ada88835..e9f28e075cf8 100644 --- a/drivers/acpi/thermal.c +++ b/drivers/acpi/thermal.c @@ -575,7 +575,23 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag) static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) { - return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); + int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); + + if (ret) + return ret; + + valid = tz->trips.critical.flags.valid | + tz->trips.hot.flags.valid | + tz->trips.passive.flags.valid; + + for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) + valid |= tz->trips.active[i].flags.valid; + + if (!valid) { + printk(KERN_WARNING FW_BUG "No valid trip found\n"); + return -ENODEV; + } + return 0; } static void acpi_thermal_check(void *data)