[PATCH 96/140] ACPICA: Abort downward walk on temporary node detection.

Len Brown
2007-02-07T18:55:15Z

From: Bob Moore <robert.moore@intel.com>

Enhancement to code that ignores temporary namespace nodes

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
drivers/acpi/namespace/nswalk.c | 26 +++++++++++++++-----------
1 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/acpi/namespace/nswalk.c b/drivers/acpi/namespace/nswalk.c
index c6619d8..bccf27d 100644
--- a/drivers/acpi/namespace/nswalk.c
+++ b/drivers/acpi/namespace/nswalk.c
@@ -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.
--
1.5.0.rc3.39.gec804