ACPICA: Namespace: Add acpi_ns_handle_to_name()

ACPICA commit f9fe27a68a90c9d32dd3156241a5e788fb6956ea

This patch adds acpi_ns_handle_to_name() so that in the acpi_get_name():
1. Logics can be made simpler,
2. Lock held for acpi_ns_handle_to_name() can also be applied to
   acpi_ns_handle_to_pathname().
The lock might be useless (see Link 1 below), but kept as acpi_get_name()
is an external API. Except the lock correction, this patch is a functional
no-op. BZ 1182, Lv Zheng.

Link: https://github.com/acpica/acpica/commit/f9fe27a6
Link: https://bugs.acpica.org/show_bug.cgi?id=1182 [# 1]
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

3 files changed, 59 insertions, 32 deletions

diff --git a/drivers/acpi/acpica/acnamesp.h b/drivers/acpi/acpica/acnamesp.h
index bb7fca1c8ba3..7affdcdfcc81 100644
--- a/drivers/acpi/acpica/acnamesp.h
+++ b/drivers/acpi/acpica/acnamesp.h
@@ -292,6 +292,9 @@ char *acpi_ns_get_normalized_pathname(struct acpi_namespace_node *node,
 char *acpi_ns_name_of_current_scope(struct acpi_walk_state *walk_state);
 
 acpi_status
+acpi_ns_handle_to_name(acpi_handle target_handle, struct acpi_buffer *buffer);
+
+acpi_status
 acpi_ns_handle_to_pathname(acpi_handle target_handle,
                            struct acpi_buffer *buffer, u8 no_trailing);
 
diff --git a/drivers/acpi/acpica/nsnames.c b/drivers/acpi/acpica/nsnames.c
index f03dd41e86d0..94d5d3339845 100644
--- a/drivers/acpi/acpica/nsnames.c
+++ b/drivers/acpi/acpica/nsnames.c
@@ -97,6 +97,51 @@ acpi_size acpi_ns_get_pathname_length(struct acpi_namespace_node *node)
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_ns_handle_to_name
+ *
+ * PARAMETERS:  target_handle           - Handle of named object whose name is
+ *                                        to be found
+ *              buffer                  - Where the name is returned
+ *
+ * RETURN:      Status, Buffer is filled with name if status is AE_OK
+ *
+ * DESCRIPTION: Build and return a full namespace name
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_handle_to_name(acpi_handle target_handle, struct acpi_buffer *buffer)
+{
+        acpi_status status;
+        struct acpi_namespace_node *node;
+        const char *node_name;
+
+        ACPI_FUNCTION_TRACE_PTR(ns_handle_to_name, target_handle);
+
+        node = acpi_ns_validate_handle(target_handle);
+        if (!node) {
+                return_ACPI_STATUS(AE_BAD_PARAMETER);
+        }
+
+        /* Validate/Allocate/Clear caller buffer */
+
+        status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
+        /* Just copy the ACPI name from the Node and zero terminate it */
+
+        node_name = acpi_ut_get_node_name(node);
+        ACPI_MOVE_NAME(buffer->pointer, node_name);
+        ((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
+
+        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%4.4s\n", (char *)buffer->pointer));
+        return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_ns_handle_to_pathname
  *
  * PARAMETERS:  target_handle           - Handle of named object whose name is
diff --git a/drivers/acpi/acpica/nsxfname.c b/drivers/acpi/acpica/nsxfname.c
index 76a1bd4bb070..e525cbe7d83b 100644
--- a/drivers/acpi/acpica/nsxfname.c
+++ b/drivers/acpi/acpica/nsxfname.c
@@ -158,8 +158,6 @@ acpi_status
 acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer *buffer)
 {
         acpi_status status;
-        struct acpi_namespace_node *node;
-        const char *node_name;
 
         /* Parameter validation */
 
@@ -172,18 +170,6 @@ acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer *buffer)
                 return (status);
         }
 
-        if (name_type == ACPI_FULL_PATHNAME ||
-            name_type == ACPI_FULL_PATHNAME_NO_TRAILING) {
-
-                /* Get the full pathname (From the namespace root) */
-
-                status = acpi_ns_handle_to_pathname(handle, buffer,
-                                                    name_type ==
-                                                    ACPI_FULL_PATHNAME ? FALSE :
-                                                    TRUE);
-                return (status);
-        }
-
         /*
          * Wants the single segment ACPI name.
          * Validate handle and convert to a namespace Node
@@ -193,27 +179,20 @@ acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer *buffer)
                 return (status);
         }
 
-        node = acpi_ns_validate_handle(handle);
-        if (!node) {
-                status = AE_BAD_PARAMETER;
-                goto unlock_and_exit;
-        }
-
-        /* Validate/Allocate/Clear caller buffer */
-
-        status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH);
-        if (ACPI_FAILURE(status)) {
-                goto unlock_and_exit;
-        }
+        if (name_type == ACPI_FULL_PATHNAME ||
+            name_type == ACPI_FULL_PATHNAME_NO_TRAILING) {
 
-        /* Just copy the ACPI name from the Node and zero terminate it */
+                /* Get the full pathname (From the namespace root) */
 
-        node_name = acpi_ut_get_node_name(node);
-        ACPI_MOVE_NAME(buffer->pointer, node_name);
-        ((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
-        status = AE_OK;
+                status = acpi_ns_handle_to_pathname(handle, buffer,
+                                                    name_type ==
+                                                    ACPI_FULL_PATHNAME ? FALSE :
+                                                    TRUE);
+        } else {
+                /* Get the single name */
 
-unlock_and_exit:
+                status = acpi_ns_handle_to_name(handle, buffer);
+        }
 
         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
         return (status);