1 files changed, 110 insertions, 3 deletions

diff --git a/drivers/acpi/dispatcher/dsutils.c b/drivers/acpi/dispatcher/dsutils.c
index d2a8cfdaec22..36518b4a79c2 100644
--- a/drivers/acpi/dispatcher/dsutils.c
+++ b/drivers/acpi/dispatcher/dsutils.c
@@ -472,7 +472,8 @@ acpi_ds_create_operand(struct acpi_walk_state *walk_state,
         /* A valid name must be looked up in the namespace */
 
         if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) &&
-            (arg->common.value.string)) {
+            (arg->common.value.string) &&
+            !(arg->common.flags & ACPI_PARSEOP_IN_STACK)) {
                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n",
                                   arg));
 
@@ -595,7 +596,8 @@ acpi_ds_create_operand(struct acpi_walk_state *walk_state,
         } else {
                 /* Check for null name case */
 
-                if (arg->common.aml_opcode == AML_INT_NAMEPATH_OP) {
+                if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) &&
+                    !(arg->common.flags & ACPI_PARSEOP_IN_STACK)) {
                         /*
                          * If the name is null, this means that this is an
                          * optional result parameter that was not specified
@@ -617,7 +619,8 @@ acpi_ds_create_operand(struct acpi_walk_state *walk_state,
                         return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
                 }
 
-                if (op_info->flags & AML_HAS_RETVAL) {
+                if ((op_info->flags & AML_HAS_RETVAL)
+                    || (arg->common.flags & ACPI_PARSEOP_IN_STACK)) {
                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                                           "Argument previously created, already stacked\n"));
 
@@ -759,3 +762,107 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state,
         ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %d", index));
         return_ACPI_STATUS(status);
 }
+
+/*****************************************************************************
+ *
+ * FUNCTION:    acpi_ds_evaluate_name_path
+ *
+ * PARAMETERS:  walk_state      - Current state of the parse tree walk,
+ *                                the opcode of current operation should be
+ *                                AML_INT_NAMEPATH_OP
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Translate the -name_path- parse tree object to the equivalent
+ *              interpreter object, convert it to value, if needed, duplicate
+ *              it, if needed, and push it onto the current result stack.
+ *
+ ****************************************************************************/
+
+acpi_status acpi_ds_evaluate_name_path(struct acpi_walk_state *walk_state)
+{
+        acpi_status status = AE_OK;
+        union acpi_parse_object *op = walk_state->op;
+        union acpi_operand_object **operand = &walk_state->operands[0];
+        union acpi_operand_object *new_obj_desc;
+        u8 type;
+
+        ACPI_FUNCTION_TRACE_PTR(ds_evaluate_name_path, walk_state);
+
+        if (!op->common.parent) {
+
+                /* This happens after certain exception processing */
+
+                goto exit;
+        }
+
+        if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
+            (op->common.parent->common.aml_opcode == AML_VAR_PACKAGE_OP) ||
+            (op->common.parent->common.aml_opcode == AML_REF_OF_OP)) {
+
+                /* TBD: Should we specify this feature as a bit of op_info->Flags of these opcodes? */
+
+                goto exit;
+        }
+
+        status = acpi_ds_create_operand(walk_state, op, 0);
+        if (ACPI_FAILURE(status)) {
+                goto exit;
+        }
+
+        if (op->common.flags & ACPI_PARSEOP_TARGET) {
+                new_obj_desc = *operand;
+                goto push_result;
+        }
+
+        type = ACPI_GET_OBJECT_TYPE(*operand);
+
+        status = acpi_ex_resolve_to_value(operand, walk_state);
+        if (ACPI_FAILURE(status)) {
+                goto exit;
+        }
+
+        if (type == ACPI_TYPE_INTEGER) {
+
+                /* It was incremented by acpi_ex_resolve_to_value */
+
+                acpi_ut_remove_reference(*operand);
+
+                status =
+                    acpi_ut_copy_iobject_to_iobject(*operand, &new_obj_desc,
+                                                    walk_state);
+                if (ACPI_FAILURE(status)) {
+                        goto exit;
+                }
+        } else {
+                /*
+                 * The object either was anew created or is
+                 * a Namespace node - don't decrement it.
+                 */
+                new_obj_desc = *operand;
+        }
+
+        /* Cleanup for name-path operand */
+
+        status = acpi_ds_obj_stack_pop(1, walk_state);
+        if (ACPI_FAILURE(status)) {
+                walk_state->result_obj = new_obj_desc;
+                goto exit;
+        }
+
+      push_result:
+
+        walk_state->result_obj = new_obj_desc;
+
+        status = acpi_ds_result_push(walk_state->result_obj, walk_state);
+        if (ACPI_SUCCESS(status)) {
+
+                /* Force to take it from stack */
+
+                op->common.flags |= ACPI_PARSEOP_IN_STACK;
+        }
+
+      exit:
+
+        return_ACPI_STATUS(status);
+}