ACPICA: Add support to externally execute _OSI method

The current implemenation of _OSI within ACPICA only allows other
control methods to execute _OSI. This change allows the host
OS to execute _OSI via the AcpiEvaluateObject interface. _OSI
is a special method -- it does not exist in the AML code, it is
implemented within ACPICA.

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>

drivers/acpi/dispatcher/dsmethod.c

@@ -412,6 +412,9 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 
 	if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) {
 		status = obj_desc->method.implementation(next_walk_state);
+		if (status == AE_OK) {
+			status = AE_CTRL_TERMINATE;
+		}
 	}
 
 	return_ACPI_STATUS(status);

drivers/acpi/parser/psparse.c

@@ -447,6 +447,10 @@ acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state)
 			  walk_state, walk_state->parser_state.aml,
 			  walk_state->parser_state.aml_size));
 
+	if (!walk_state->parser_state.aml) {
+		return_ACPI_STATUS(AE_NULL_OBJECT);
+	}
+
 	/* Create and initialize a new thread state */
 
 	thread = acpi_ut_create_thread_state();

drivers/acpi/parser/psxface.c

@@ -45,6 +45,7 @@
 #include <acpi/acparser.h>
 #include <acpi/acdispat.h>
 #include <acpi/acinterp.h>
+#include <acpi/amlcode.h>
 
 #define _COMPONENT          ACPI_PARSER
 ACPI_MODULE_NAME("psxface")
@@ -278,6 +279,22 @@ acpi_status acpi_ps_execute_method(struct acpi_evaluate_info *info)
 		goto cleanup;
 	}
 
+	/* Invoke an internal method if necessary */
+
+	if (info->obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) {
+		status = info->obj_desc->method.implementation(walk_state);
+		info->return_object = walk_state->return_desc;
+
+		/* Cleanup states */
+
+		acpi_ds_scope_stack_clear(walk_state);
+		acpi_ps_cleanup_scope(&walk_state->parser_state);
+		acpi_ds_terminate_control_method(walk_state->method_desc,
+						 walk_state);
+		acpi_ds_delete_walk_state(walk_state);
+		goto cleanup;
+	}
+
 	/* Parse the AML */
 
 	status = acpi_ps_parse_aml(walk_state);

drivers/acpi/utilities/uteval.c

@@ -129,7 +129,7 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
 
 			/* The interface is supported */
 
-			return_ACPI_STATUS(AE_CTRL_TERMINATE);
+			return_ACPI_STATUS(AE_OK);
 		}
 	}
 
@@ -143,13 +143,13 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
 
 		/* The interface is supported */
 
-		return_ACPI_STATUS(AE_CTRL_TERMINATE);
+		return_ACPI_STATUS(AE_OK);
 	}
 
 	/* The interface is not supported */
 
 	return_desc->integer.value = 0;
-	return_ACPI_STATUS(AE_CTRL_TERMINATE);
+	return_ACPI_STATUS(AE_OK);
 }
 
 /*******************************************************************************