ACPI: add ACPI_TYPE_LOCAL_REFERENCE support to acpi_extract_package()

Add ACPI_TYPE_LOCAL_REFERENCE support to acpi_extract_package(),
so that we can use this helper for more cases like _ART/_TRT.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>

1 files changed, 27 insertions, 1 deletions

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 07c8c5a5ee95..1ed7aba99d8d 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -149,6 +149,21 @@ acpi_extract_package(union acpi_object *package,
                                 break;
                         }
                         break;
+                case ACPI_TYPE_LOCAL_REFERENCE:
+                        switch (format_string[i]) {
+                        case 'R':
+                                size_required += sizeof(void *);
+                                tail_offset += sizeof(void *);
+                                break;
+                        default:
+                                printk(KERN_WARNING PREFIX "Invalid package element"
+                                              " [%d] got reference,"
+                                              " expecting [%c]\n",
+                                              i, format_string[i]);
+                                return AE_BAD_DATA;
+                                break;
+                        }
+                        break;
 
                 case ACPI_TYPE_PACKAGE:
                 default:
@@ -247,7 +262,18 @@ acpi_extract_package(union acpi_object *package,
                                 break;
                         }
                         break;
-
+                case ACPI_TYPE_LOCAL_REFERENCE:
+                        switch (format_string[i]) {
+                        case 'R':
+                                *(void **)head =
+                                    (void *)element->reference.handle;
+                                head += sizeof(void *);
+                                break;
+                        default:
+                                /* Should never get here */
+                                break;
+                        }
+                        break;
                 case ACPI_TYPE_PACKAGE:
                         /* TBD: handle nested packages... */
                 default: