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>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index 5f09fb8c0e0..7f16f5f8e7d 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;
         }