1 files changed, 26 insertions, 1 deletions

diff --git a/drivers/acpi/acpica/exutils.c b/drivers/acpi/acpica/exutils.c
index 8ad93146dd32..eb6798ba8b59 100644
--- a/drivers/acpi/acpica/exutils.c
+++ b/drivers/acpi/acpica/exutils.c
@@ -6,7 +6,7 @@
  *****************************************************************************/
 
 /*
- * 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
@@ -435,4 +435,29 @@ void acpi_ex_integer_to_string(char *out_string, u64 value)
         }
 }
 
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_is_valid_space_id
+ *
+ * PARAMETERS:  space_id            - ID to be validated
+ *
+ * RETURN:      TRUE if valid/supported ID.
+ *
+ * DESCRIPTION: Validate an operation region space_iD.
+ *
+ ******************************************************************************/
+
+u8 acpi_is_valid_space_id(u8 space_id)
+{
+
+        if ((space_id >= ACPI_NUM_PREDEFINED_REGIONS) &&
+            (space_id < ACPI_USER_REGION_BEGIN) &&
+            (space_id != ACPI_ADR_SPACE_DATA_TABLE) &&
+            (space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
+                return (FALSE);
+        }
+
+        return (TRUE);
+}
+
 #endif