From 4973b22aa8c70fe036e3e0039f104cf5bb7fe2b1 Mon Sep 17 00:00:00 2001
From: Zhang Rui <rui.zhang@intel.com>
Date: Mon, 11 May 2009 09:36:01 +0800
Subject: [PATCH] ACPI processor: reset the throttling state once it's invalid
If the BIOS hands us an invalid throttling state,
write a valid state.
http://bugzilla.kernel.org/show_bug.cgi?id=13259
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: James Ettle <theholyettlz@googlemail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
drivers/acpi/processor_throttling.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index 5f09fb8c0e054..7f16f5f8e7d39 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -838,6 +838,14 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
ret = acpi_read_throttling_status(pr, &value);
if (ret >= 0) {
state = acpi_get_throttling_state(pr, value);
+ if (state == -1) {
+ ACPI_WARNING((AE_INFO,
+ "Invalid throttling state, reset\n"));
+ state = 0;
+ ret = acpi_processor_set_throttling(pr, state);
+ if (ret)
+ return ret;
+ }
pr->throttling.state = state;
}
--
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