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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 <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Lin Ming 2008-04-10 19:06:42 +04:00 committed by Len Brown
parent 8246934b7c
commit 9accd46459
1 changed files with 24 additions and 0 deletions
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24
drivers/acpi/parser/psparse.c
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@ -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,