ACPICA: DeRefOf operator: Update to fully resolve FieldUnit and BufferField refs.

Previously, references to these objects were resolved only to the actual
FieldUnit or BufferField object. The correct behavior is to resolve these
references to an actual value.
The problem is that DerefOf did not resolve these objects to actual
values.  An "Integer" object is simple, return the value.  But a field in
an operation region will require a read operation.  For a BufferField, the
appropriate data must be extracted from the parent buffer.

NOTE: It appears that this issues is present in Windows7 but not
Windows8.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/acpica/exoparg1.c b/drivers/acpi/acpica/exoparg1.c
index 814b4a3d656ad1dc3d9acf438258735569017656..3482df4a69f94eb7b50bdb8cba7516aa2c122f22 100644 (file)
--- a/drivers/acpi/acpica/exoparg1.c
+++ b/drivers/acpi/acpica/exoparg1.c
@@ -990,11 +990,40 @@ acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
                                                                         acpi_namespace_node
                                                                         *)
                                                                        return_desc);
-                               }
+                                       if (!return_desc) {
+                                               break;
+                                       }
+
+                                       /*
+                                        * June 2013:
+                                        * buffer_fields/field_units require additional resolution
+                                        */
+                                       switch (return_desc->common.type) {
+                                       case ACPI_TYPE_BUFFER_FIELD:
+                                       case ACPI_TYPE_LOCAL_REGION_FIELD:
+                                       case ACPI_TYPE_LOCAL_BANK_FIELD:
+                                       case ACPI_TYPE_LOCAL_INDEX_FIELD:
+
+                                               status =
+                                                   acpi_ex_read_data_from_field
+                                                   (walk_state, return_desc,
+                                                    &temp_desc);
+                                               if (ACPI_FAILURE(status)) {
+                                                       goto cleanup;
+                                               }
 
-                               /* Add another reference to the object! */
+                                               return_desc = temp_desc;
+                                               break;
 
-                               acpi_ut_add_reference(return_desc);
+                                       default:
+
+                                               /* Add another reference to the object */
+
+                                               acpi_ut_add_reference
+                                                   (return_desc);
+                                               break;
+                                       }
+                               }
                                break;
 
                        default: