ACPICA: Fix race condition with AcpiWalkNamespace.

Fixed a problem with a possible race condition between threads executing
AcpiWalkNamespace and the AML interpreter. This condition was removed by
modifying AcpiWalkNamespace to (by default) ignore all temporary
namespace entries created during any concurrent control method execution

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/acpi/namespace/nsdump.c b/drivers/acpi/namespace/nsdump.c
index da88834f55e7..ec5ce59acb98 100644
--- a/drivers/acpi/namespace/nsdump.c
+++ b/drivers/acpi/namespace/nsdump.c
@@ -226,6 +226,12 @@ acpi_ns_dump_one_object(acpi_handle obj_handle,
         obj_desc = acpi_ns_get_attached_object(this_node);
         acpi_dbg_level = dbg_level;
 
+        /* Temp nodes are those nodes created by a control method */
+
+        if (this_node->flags & ANOBJ_TEMPORARY) {
+                acpi_os_printf("(T) ");
+        }
+
         switch (info->display_type & ACPI_DISPLAY_MASK) {
         case ACPI_DISPLAY_SUMMARY:
 
@@ -623,7 +629,8 @@ acpi_ns_dump_objects(acpi_object_type type,
         info.display_type = display_type;
 
         (void)acpi_ns_walk_namespace(type, start_handle, max_depth,
-                                     ACPI_NS_WALK_NO_UNLOCK,
+                                     ACPI_NS_WALK_NO_UNLOCK |
+                                     ACPI_NS_WALK_TEMP_NODES,
                                      acpi_ns_dump_one_object, (void *)&info,
                                      NULL);
 }