From 9accd46459b8c068540451fdab07dbfcefaf7280 Mon Sep 17 00:00:00 2001 From: Lin Ming Date: Thu, 10 Apr 2008 19:06:42 +0400 Subject: [PATCH] ACPICA: Methods now implicitly return 0 in slack mode Implemented an enhancement to the interpreter "slack mode". In the absence of an explicit return or an implicitly returned object from the last executed opcode, a control method will now implicitly return an integer of value 0 for Microsoft compatibility. http://www.acpica.org/bugzilla/show_bug.cgi?id=392 Signed-off-by: Lin Ming Signed-off-by: Bob Moore Signed-off-by: Alexey Starikovskiy Signed-off-by: Len Brown --- drivers/acpi/parser/psparse.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/acpi/parser/psparse.c b/drivers/acpi/parser/psparse.c index a8995ca..a4c4020 100644 --- a/drivers/acpi/parser/psparse.c +++ b/drivers/acpi/parser/psparse.c @@ -594,6 +594,30 @@ acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state) * The object is deleted */ if (!previous_walk_state->return_desc) { + /* + * In slack mode execution, if there is no return value + * we should implicitly return zero (0) as a default value. + */ + if (acpi_gbl_enable_interpreter_slack && + !previous_walk_state-> + implicit_return_obj) { + previous_walk_state-> + implicit_return_obj = + acpi_ut_create_internal_object + (ACPI_TYPE_INTEGER); + if (!previous_walk_state-> + implicit_return_obj) { + return_ACPI_STATUS + (AE_NO_MEMORY); + } + + previous_walk_state-> + implicit_return_obj-> + integer.value = 0; + } + + /* Restart the calling control method */ + status = acpi_ds_restart_control_method (walk_state, -- 2.7.4