From: Zhang Rui <rui.zhang@xxxxxxxxx> 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@xxxxxxxxx> Signed-off-by: Len Brown <len.brown@xxxxxxxxx> --- Documentation/kernel-parameters.txt | 2 +- drivers/acpi/thermal.c | 8 +++++--- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 1150444..0707423 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -2146,7 +2146,7 @@ and is between 256 and 4096 characters. It is defined in the file thermal.crt= [HW,ACPI] -1: disable all critical trip points in all thermal zones - <degrees C>: lower all critical trip points + <degrees C>: override all critical trip points thermal.nocrt= [HW,ACPI] Set to disable actions on ACPI thermal zone 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; } } } -- 1.5.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
