ACPICA: Abort downward walk on temporary node detection. (c1014629) · Commits · 戴 / test

drivers/acpi/namespace/nswalk.c

+15 −11

Original line number	Diff line number	Diff line
		@@ -194,24 +194,28 @@ acpi_ns_walk_namespace(acpi_object_type type,
		child_node);
		if (child_node) {

		/* Found node, Get the type if we are not searching for ANY */
		/* Found next child, get the type if we are not searching for ANY */

		if (type != ACPI_TYPE_ANY) {
		child_type = child_node->type;
		}

		/*
		* 1) Type must match
		* 2) Permanent namespace nodes are OK
		* 3) Ignore temporary nodes unless told otherwise. Typically,
		* the temporary nodes can cause a race condition where they can
		* be deleted during the execution of the user function. Only the
		* debugger namespace dump will examine the temporary nodes.
		* Ignore all temporary namespace nodes (created during control
		* method execution) unless told otherwise. These temporary nodes
		* can cause a race condition because they can be deleted during the
		* execution of the user function (if the namespace is unlocked before
		* invocation of the user function.) Only the debugger namespace dump
		* will examine the temporary nodes.
		*/
		if ((child_type == type) &&
		(!(child_node->flags & ANOBJ_TEMPORARY) \|\|
		(child_node->flags & ANOBJ_TEMPORARY)
		&& (flags & ACPI_NS_WALK_TEMP_NODES))) {
		if ((child_node->flags & ANOBJ_TEMPORARY) &&
		!(flags & ACPI_NS_WALK_TEMP_NODES)) {
		status = AE_CTRL_DEPTH;
		}

		/* Type must match requested type */

		else if (child_type == type) {
		/*
		* Found a matching node, invoke the user callback function.
		* Unlock the namespace if flag is set.