1 files changed, 127 insertions, 86 deletions

diff --git a/drivers/acpi/acpica/nsalloc.c b/drivers/acpi/acpica/nsalloc.c
index efc971ab7d6..607eb9e5150 100644
--- a/drivers/acpi/acpica/nsalloc.c
+++ b/drivers/acpi/acpica/nsalloc.c
@@ -5,7 +5,7 @@
  ******************************************************************************/
 
 /*
- * Copyright (C) 2000 - 2008, Intel Corp.
+ * Copyright (C) 2000 - 2014, Intel Corp.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -52,7 +52,7 @@ ACPI_MODULE_NAME("nsalloc")
  *
  * FUNCTION:    acpi_ns_create_node
  *
- * PARAMETERS:  Name            - Name of the new node (4 char ACPI name)
+ * PARAMETERS:  name            - Name of the new node (4 char ACPI name)
  *
  * RETURN:      New namespace node (Null on failure)
  *
@@ -92,23 +92,84 @@ struct acpi_namespace_node *acpi_ns_create_node(u32 name)
  *
  * FUNCTION:    acpi_ns_delete_node
  *
- * PARAMETERS:  Node            - Node to be deleted
+ * PARAMETERS:  node            - Node to be deleted
  *
  * RETURN:      None
  *
- * DESCRIPTION: Delete a namespace node
+ * DESCRIPTION: Delete a namespace node. All node deletions must come through
+ *              here. Detaches any attached objects, including any attached
+ *              data. If a handler is associated with attached data, it is
+ *              invoked before the node is deleted.
  *
  ******************************************************************************/
 
 void acpi_ns_delete_node(struct acpi_namespace_node *node)
 {
+	union acpi_operand_object *obj_desc;
+	union acpi_operand_object *next_desc;
+
+	ACPI_FUNCTION_NAME(ns_delete_node);
+
+	/* Detach an object if there is one */
+
+	acpi_ns_detach_object(node);
+
+	/*
+	 * Delete an attached data object list if present (objects that were
+	 * attached via acpi_attach_data). Note: After any normal object is
+	 * detached above, the only possible remaining object(s) are data
+	 * objects, in a linked list.
+	 */
+	obj_desc = node->object;
+	while (obj_desc && (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA)) {
+
+		/* Invoke the attached data deletion handler if present */
+
+		if (obj_desc->data.handler) {
+			obj_desc->data.handler(node, obj_desc->data.pointer);
+		}
+
+		next_desc = obj_desc->common.next_object;
+		acpi_ut_remove_reference(obj_desc);
+		obj_desc = next_desc;
+	}
+
+	/* Special case for the statically allocated root node */
+
+	if (node == acpi_gbl_root_node) {
+		return;
+	}
+
+	/* Now we can delete the node */
+
+	(void)acpi_os_release_object(acpi_gbl_namespace_cache, node);
+
+	ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++);
+	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Node %p, Remaining %X\n",
+			  node, acpi_gbl_current_node_count));
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_remove_node
+ *
+ * PARAMETERS:  node            - Node to be removed/deleted
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Remove (unlink) and delete a namespace node
+ *
+ ******************************************************************************/
+
+void acpi_ns_remove_node(struct acpi_namespace_node *node)
+{
 	struct acpi_namespace_node *parent_node;
 	struct acpi_namespace_node *prev_node;
 	struct acpi_namespace_node *next_node;
 
-	ACPI_FUNCTION_TRACE_PTR(ns_delete_node, node);
+	ACPI_FUNCTION_TRACE_PTR(ns_remove_node, node);
 
-	parent_node = acpi_ns_get_parent_node(node);
+	parent_node = node->parent;
 
 	prev_node = NULL;
 	next_node = parent_node->child;
@@ -117,37 +178,25 @@ void acpi_ns_delete_node(struct acpi_namespace_node *node)
 
 	while (next_node != node) {
 		prev_node = next_node;
-		next_node = prev_node->peer;
+		next_node = next_node->peer;
 	}
 
 	if (prev_node) {
 
 		/* Node is not first child, unlink it */
 
-		prev_node->peer = next_node->peer;
-		if (next_node->flags & ANOBJ_END_OF_PEER_LIST) {
-			prev_node->flags |= ANOBJ_END_OF_PEER_LIST;
-		}
+		prev_node->peer = node->peer;
 	} else {
-		/* Node is first child (has no previous peer) */
-
-		if (next_node->flags & ANOBJ_END_OF_PEER_LIST) {
-
-			/* No peers at all */
-
-			parent_node->child = NULL;
-		} else {	/* Link peer list to parent */
-
-			parent_node->child = next_node->peer;
-		}
+		/*
+		 * Node is first child (has no previous peer).
+		 * Link peer list to parent
+		 */
+		parent_node->child = node->peer;
 	}
 
-	ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++);
+	/* Delete the node and any attached objects */
 
-	/* Detach an object if there is one, then delete the node */
-
-	acpi_ns_detach_object(node);
-	(void)acpi_os_release_object(acpi_gbl_namespace_cache, node);
+	acpi_ns_delete_node(node);
 	return_VOID;
 }
 
@@ -157,8 +206,8 @@ void acpi_ns_delete_node(struct acpi_namespace_node *node)
  *
  * PARAMETERS:  walk_state      - Current state of the walk
  *              parent_node     - The parent of the new Node
- *              Node            - The new Node to install
- *              Type            - ACPI object type of the new Node
+ *              node            - The new Node to install
+ *              type            - ACPI object type of the new Node
  *
  * RETURN:      None
  *
@@ -180,33 +229,42 @@ void acpi_ns_install_node(struct acpi_walk_state *walk_state, struct acpi_namesp
 
 	ACPI_FUNCTION_TRACE(ns_install_node);
 
-	/*
-	 * Get the owner ID from the Walk state. The owner ID is used to track
-	 * table deletion and deletion of objects created by methods.
-	 */
 	if (walk_state) {
+		/*
+		 * Get the owner ID from the Walk state. The owner ID is used to
+		 * track table deletion and deletion of objects created by methods.
+		 */
 		owner_id = walk_state->owner_id;
+
+		if ((walk_state->method_desc) &&
+		    (parent_node != walk_state->method_node)) {
+			/*
+			 * A method is creating a new node that is not a child of the
+			 * method (it is non-local). Mark the executing method as having
+			 * modified the namespace. This is used for cleanup when the
+			 * method exits.
+			 */
+			walk_state->method_desc->method.info_flags |=
+			    ACPI_METHOD_MODIFIED_NAMESPACE;
+		}
 	}
 
 	/* Link the new entry into the parent and existing children */
 
+	node->peer = NULL;
+	node->parent = parent_node;
 	child_node = parent_node->child;
+
 	if (!child_node) {
 		parent_node->child = node;
-		node->flags |= ANOBJ_END_OF_PEER_LIST;
-		node->peer = parent_node;
 	} else {
-		while (!(child_node->flags & ANOBJ_END_OF_PEER_LIST)) {
+		/* Add node to the end of the peer list */
+
+		while (child_node->peer) {
 			child_node = child_node->peer;
 		}
 
 		child_node->peer = node;
-
-		/* Clear end-of-list flag */
-
-		child_node->flags &= ~ANOBJ_END_OF_PEER_LIST;
-		node->flags |= ANOBJ_END_OF_PEER_LIST;
-		node->peer = parent_node;
 	}
 
 	/* Init the new entry */
@@ -240,9 +298,8 @@ void acpi_ns_install_node(struct acpi_walk_state *walk_state, struct acpi_namesp
 
 void acpi_ns_delete_children(struct acpi_namespace_node *parent_node)
 {
-	struct acpi_namespace_node *child_node;
 	struct acpi_namespace_node *next_node;
-	u8 flags;
+	struct acpi_namespace_node *node_to_delete;
 
 	ACPI_FUNCTION_TRACE_PTR(ns_delete_children, parent_node);
 
@@ -250,51 +307,26 @@ void acpi_ns_delete_children(struct acpi_namespace_node *parent_node)
 		return_VOID;
 	}
 
-	/* If no children, all done! */
-
-	child_node = parent_node->child;
-	if (!child_node) {
-		return_VOID;
-	}
-
 	/* Deallocate all children at this level */
 
-	do {
-
-		/* Get the things we need */
-
-		next_node = child_node->peer;
-		flags = child_node->flags;
+	next_node = parent_node->child;
+	while (next_node) {
 
 		/* Grandchildren should have all been deleted already */
 
-		if (child_node->child) {
+		if (next_node->child) {
 			ACPI_ERROR((AE_INFO, "Found a grandchild! P=%p C=%p",
-				    parent_node, child_node));
+				    parent_node, next_node));
 		}
 
-		/* Now we can free this child object */
-
-		ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++);
-
-		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
-				  "Object %p, Remaining %X\n", child_node,
-				  acpi_gbl_current_node_count));
-
-		/* Detach an object if there is one, then free the child node */
-
-		acpi_ns_detach_object(child_node);
-
-		/* Now we can delete the node */
-
-		(void)acpi_os_release_object(acpi_gbl_namespace_cache,
-					     child_node);
-
-		/* And move on to the next child in the list */
-
-		child_node = next_node;
-
-	} while (!(flags & ANOBJ_END_OF_PEER_LIST));
+		/*
+		 * Delete this child node and move on to the next child in the list.
+		 * No need to unlink the node since we are deleting the entire branch.
+		 */
+		node_to_delete = next_node;
+		next_node = next_node->peer;
+		acpi_ns_delete_node(node_to_delete);
+	};
 
 	/* Clear the parent's child pointer */
 
@@ -310,7 +342,7 @@ void acpi_ns_delete_children(struct acpi_namespace_node *parent_node)
  *
  * RETURN:      None.
  *
- * DESCRIPTION: Delete a subtree of the namespace.  This includes all objects
+ * DESCRIPTION: Delete a subtree of the namespace. This includes all objects
  *              stored within the subtree.
  *
  ******************************************************************************/
@@ -319,6 +351,7 @@ void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
 {
 	struct acpi_namespace_node *child_node = NULL;
 	u32 level = 1;
+	acpi_status status;
 
 	ACPI_FUNCTION_TRACE(ns_delete_namespace_subtree);
 
@@ -326,6 +359,13 @@ void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
 		return_VOID;
 	}
 
+	/* Lock namespace for possible update */
+
+	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
+	if (ACPI_FAILURE(status)) {
+		return_VOID;
+	}
+
 	/*
 	 * Traverse the tree of objects until we bubble back up
 	 * to where we started.
@@ -371,10 +411,11 @@ void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
 
 			/* Move up the tree to the grandparent */
 
-			parent_node = acpi_ns_get_parent_node(parent_node);
+			parent_node = parent_node->parent;
 		}
 	}
 
+	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 	return_VOID;
 }
 
@@ -387,7 +428,7 @@ void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
  * RETURN:      Status
  *
  * DESCRIPTION: Delete entries within the namespace that are owned by a
- *              specific ID.  Used to delete entire ACPI tables.  All
+ *              specific ID. Used to delete entire ACPI tables. All
  *              reference counts are updated.
  *
  * MUTEX:       Locks namespace during deletion walk.
@@ -433,7 +474,7 @@ void acpi_ns_delete_namespace_by_owner(acpi_owner_id owner_id)
 
 		if (deletion_node) {
 			acpi_ns_delete_children(deletion_node);
-			acpi_ns_delete_node(deletion_node);
+			acpi_ns_remove_node(deletion_node);
 			deletion_node = NULL;
 		}
 
@@ -476,7 +517,7 @@ void acpi_ns_delete_namespace_by_owner(acpi_owner_id owner_id)
 
 			/* Move up the tree to the grandparent */
 
-			parent_node = acpi_ns_get_parent_node(parent_node);
+			parent_node = parent_node->parent;
 		}
 	}