ACPICA: Optimization: Reduce the number of namespace walks

On control method exit, only walk the namespace if the method is
known to have created namespace objects outside of its local scope.

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/drivers/acpi/acpica/nsalloc.c b/drivers/acpi/acpica/nsalloc.c
index 8d3a43a061a..1e5ff803d9a 100644
--- a/drivers/acpi/acpica/nsalloc.c
+++ b/drivers/acpi/acpica/nsalloc.c
@@ -219,12 +219,24 @@ 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.flags |=
+                            AOPOBJ_MODIFIED_NAMESPACE;
+                }
         }
 
         /* Link the new entry into the parent and existing children */