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authorZhang Rui <rui.zhang@intel.com>2008-10-17 02:41:20 -0400
committerLen Brown <len.brown@intel.com>2008-10-17 02:42:03 -0400
commit22a94d79a34bf010d11996d30eed8ee3fc1a4fbf (patch)
tree5213d9bc43c0613a4606e8d2928f2e17f7f74c2c /drivers/acpi/thermal.c
parent7745384080ef70f7710530afa3e45477b126e056 (diff)
downloadop-kernel-dev-22a94d79a34bf010d11996d30eed8ee3fc1a4fbf.zip
op-kernel-dev-22a94d79a34bf010d11996d30eed8ee3fc1a4fbf.tar.gz
ACPI: Allow overriding to higher critical trip point.
http://bugzilla.kernel.org/show_bug.cgi?id=9129 lenb: Note that overriding a critical trip point may simply fool the user into thinking that they have control that they do not actually have. For it is EC firmware that decides when the EC sends Linux temperature change events, and the EC may or may not decide to send Linux these events anywhere in the neighborhood of the fake override trip points. Beware. note also that thermal.nocrt is already available to disable crtical trip point actios, and thermal.crt=-1 is already available to disabled critical trip points entirely. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/thermal.c')
-rw-r--r--drivers/acpi/thermal.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index e052a75..e9e17df 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -388,10 +388,12 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
} else if (crt > 0) {
unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
/*
- * Allow override to lower critical threshold
+ * Allow override critical threshold
*/
- if (crt_k < tz->trips.critical.temperature)
- tz->trips.critical.temperature = crt_k;
+ if (crt_k > tz->trips.critical.temperature)
+ printk(KERN_WARNING PREFIX
+ "Critical threshold %d C\n", crt);
+ tz->trips.critical.temperature = crt_k;
}
}
}
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