ACPI: Use ACPICA native way to decode the PLD buffer

This patch is on top of the ACPICA 20120816 release, which implemented
a native way to decode PLD buffer, so use it instead of leting upper
level users do the decoding.

v2: Modify the check for PLD buffer length to reject buffers whose
length < 16

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 3e87c9c538aa..462f7e300363 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -384,7 +384,7 @@ acpi_evaluate_reference(acpi_handle handle,
 EXPORT_SYMBOL(acpi_evaluate_reference);
 
 acpi_status
-acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld *pld)
+acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld)
 {
         acpi_status status;
         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -400,13 +400,16 @@ acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld *pld)
         if (!output || output->type != ACPI_TYPE_PACKAGE
             || !output->package.count
             || output->package.elements[0].type != ACPI_TYPE_BUFFER
-            || output->package.elements[0].buffer.length > sizeof(*pld)) {
+            || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) {
                 status = AE_TYPE;
                 goto out;
         }
 
-        memcpy(pld, output->package.elements[0].buffer.pointer,
-               output->package.elements[0].buffer.length);
+        status = acpi_decode_pld_buffer(
+                        output->package.elements[0].buffer.pointer,
+                        output->package.elements[0].buffer.length,
+                        pld);
+
 out:
         kfree(buffer.pointer);
         return status;