1 files changed, 67 insertions, 2 deletions

diff --git a/drivers/acpi/acpica/rscreate.c b/drivers/acpi/acpica/rscreate.c
index 4ce6e1147e80..46d6eb38ae66 100644
--- a/drivers/acpi/acpica/rscreate.c
+++ b/drivers/acpi/acpica/rscreate.c
@@ -5,7 +5,7 @@
  ******************************************************************************/
 
 /*
- * Copyright (C) 2000 - 2011, Intel Corp.
+ * Copyright (C) 2000 - 2012, Intel Corp.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -51,6 +51,70 @@ ACPI_MODULE_NAME("rscreate")
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_buffer_to_resource
+ *
+ * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
+ *              aml_buffer_length   - Length of the aml_buffer
+ *              resource_ptr        - Where the converted resource is returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Convert a raw AML buffer to a resource list
+ *
+ ******************************************************************************/
+acpi_status
+acpi_buffer_to_resource(u8 *aml_buffer,
+                        u16 aml_buffer_length,
+                        struct acpi_resource **resource_ptr)
+{
+        acpi_status status;
+        acpi_size list_size_needed;
+        void *resource;
+        void *current_resource_ptr;
+
+        /*
+         * Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag
+         * is not required here.
+         */
+
+        /* Get the required length for the converted resource */
+
+        status = acpi_rs_get_list_length(aml_buffer, aml_buffer_length,
+                                         &list_size_needed);
+        if (status == AE_AML_NO_RESOURCE_END_TAG) {
+                status = AE_OK;
+        }
+        if (ACPI_FAILURE(status)) {
+                return (status);
+        }
+
+        /* Allocate a buffer for the converted resource */
+
+        resource = ACPI_ALLOCATE_ZEROED(list_size_needed);
+        current_resource_ptr = resource;
+        if (!resource) {
+                return (AE_NO_MEMORY);
+        }
+
+        /* Perform the AML-to-Resource conversion */
+
+        status = acpi_ut_walk_aml_resources(aml_buffer, aml_buffer_length,
+                                            acpi_rs_convert_aml_to_resources,
+                                            &current_resource_ptr);
+        if (status == AE_AML_NO_RESOURCE_END_TAG) {
+                status = AE_OK;
+        }
+        if (ACPI_FAILURE(status)) {
+                ACPI_FREE(resource);
+        } else {
+                *resource_ptr = resource;
+        }
+
+        return (status);
+}
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_rs_create_resource_list
  *
  * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
@@ -66,9 +130,10 @@ ACPI_MODULE_NAME("rscreate")
  *              of device resources.
  *
  ******************************************************************************/
+
 acpi_status
 acpi_rs_create_resource_list(union acpi_operand_object *aml_buffer,
-                             struct acpi_buffer *output_buffer)
+                             struct acpi_buffer * output_buffer)
 {
 
         acpi_status status;