ACPI: ACPI Exception (): AE_NOT_FOUND, Processor Device is not present

ACPI Exception (acpi_processor-0677): AE_NOT_FOUND, Processor Device is not
present [20060707]

According to the ACPI spec 6.3.7,
"If a device object (including the processor object) does not have an
_STA object, then OSPM assumes that all of the above bits are set,
(in other words, the device is present, enabled, shown in the UI
and funtioning)".

is_processor_present shoud return 1 if the processor device object exists
while it doesn't have an _STA object.

http://bugzilla.kernel.org/show_bug.cgi?id=8570

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index e48ee4f8749f..c53113e18004 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -812,11 +812,18 @@ static int is_processor_present(acpi_handle handle)
 
 
         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
-        if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
-                ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
-                return 0;
-        }
-        return 1;
+        /*
+         * if a processor object does not have an _STA object,
+         * OSPM assumes that the processor is present.
+         */
+        if (status == AE_NOT_FOUND)
+                return 1;
+
+        if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
+                return 1;
+
+        ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
+        return 0;
 }
 
 static