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authorBob Moore <robert.moore@intel.com>2012-12-31 00:05:33 +0000
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-01-10 12:36:20 +0100
commitf8c9bfe461bb2923ae5d070f1ec0fb312825caad (patch)
tree977bd0cd3ba62e032cbe96fb10ca17b885171d42
parent04a81dce13c672757637b759039de216ed29a536 (diff)
ACPICA: Add root node optimization to internal get namespace node function.
Detect a request for the root node (a lone backslash) up front before invoking a full namespace lookup. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/acpi/acpica/nsutils.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nsutils.c b/drivers/acpi/acpica/nsutils.c
index d2dfe6172181..596d4ccc963f 100644
--- a/drivers/acpi/acpica/nsutils.c
+++ b/drivers/acpi/acpica/nsutils.c
@@ -671,6 +671,8 @@ acpi_ns_get_node(struct acpi_namespace_node *prefix_node,
ACPI_FUNCTION_TRACE_PTR(ns_get_node, ACPI_CAST_PTR(char, pathname));
+ /* Simplest case is a null pathname */
+
if (!pathname) {
*return_node = prefix_node;
if (!prefix_node) {
@@ -679,6 +681,13 @@ acpi_ns_get_node(struct acpi_namespace_node *prefix_node,
return_ACPI_STATUS(AE_OK);
}
+ /* Quick check for a reference to the root */
+
+ if (ACPI_IS_ROOT_PREFIX(pathname[0]) && (!pathname[1])) {
+ *return_node = acpi_gbl_root_node;
+ return_ACPI_STATUS(AE_OK);
+ }
+
/* Convert path to internal representation */
status = acpi_ns_internalize_name(pathname, &internal_path);