ACPI: Add support for acpi_load_table/acpi_unload_table_id

[sfrench/cifs-2.6.git] / drivers / acpi / tables / tbxface.c

diff --git a/drivers/acpi/tables/tbxface.c b/drivers/acpi/tables/tbxface.c
index 7767987be15a0d517acf10fa5b6327b203e08f23..5ba9303293ad968c4366ca49c4044291cd4bf10c 100644 (file)
--- a/drivers/acpi/tables/tbxface.c
+++ b/drivers/acpi/tables/tbxface.c
@@ -123,7 +123,6 @@ acpi_status acpi_load_tables(void)
 
 ACPI_EXPORT_SYMBOL(acpi_load_tables)
 
-#ifdef ACPI_FUTURE_USAGE
 /*******************************************************************************
  *
  * FUNCTION:    acpi_load_table
@@ -219,6 +218,59 @@ acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
 
 ACPI_EXPORT_SYMBOL(acpi_load_table)
 
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_unload_table_id
+ *
+ * PARAMETERS:  table_type    - Type of table to be unloaded
+ *              id            - Owner ID of the table to be removed.
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: This routine is used to force the unload of a table (by id)
+ *
+ ******************************************************************************/
+acpi_status acpi_unload_table_id(acpi_table_type table_type, acpi_owner_id id)
+{
+       struct acpi_table_desc *table_desc;
+       acpi_status status;
+
+       ACPI_FUNCTION_TRACE(acpi_unload_table);
+
+       /* Parameter validation */
+       if (table_type > ACPI_TABLE_ID_MAX)
+               return_ACPI_STATUS(AE_BAD_PARAMETER);
+
+       /* Find table from the requested type list */
+       table_desc = acpi_gbl_table_lists[table_type].next;
+       while (table_desc && table_desc->owner_id != id)
+               table_desc = table_desc->next;
+
+       if (!table_desc)
+               return_ACPI_STATUS(AE_NOT_EXIST);
+
+       /*
+        * Delete all namespace objects owned by this table. Note that these
+        * objects can appear anywhere in the namespace by virtue of the AML
+        * "Scope" operator. Thus, we need to track ownership by an ID, not
+        * simply a position within the hierarchy
+        */
+       acpi_ns_delete_namespace_by_owner(table_desc->owner_id);
+
+       status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+       if (ACPI_FAILURE(status))
+               return_ACPI_STATUS(status);
+
+       (void)acpi_tb_uninstall_table(table_desc);
+
+       (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+
+       return_ACPI_STATUS(AE_OK);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
+
+#ifdef ACPI_FUTURE_USAGE
 /*******************************************************************************
  *
  * FUNCTION:    acpi_unload_table