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ACPICA: Enhance implicit return mechanism 

For Windows compatibility, return an implicit integer of value
zero for methods that have no executable code. A default implicit
value of zero is provided for methods. Lin Ming.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Lin Ming 2008-11-13 11:25:22 +08:00 committed by Len Brown
parent eeb4437e63
commit 7a4b8131ac
1 changed files with 16 additions and 0 deletions
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16
drivers/acpi/parser/psxface.c
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@ -295,6 +295,22 @@ acpi_status acpi_ps_execute_method(struct acpi_evaluate_info *info)
goto cleanup;
}
/*
* Start method evaluation with an implicit return of zero.
* This is done for Windows compatibility.
*/
if (acpi_gbl_enable_interpreter_slack) {
walk_state->implicit_return_obj =
acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
if (!walk_state->implicit_return_obj) {
status = AE_NO_MEMORY;
acpi_ds_delete_walk_state(walk_state);
goto cleanup;
}
walk_state->implicit_return_obj->integer.value = 0;
}
/* Parse the AML */
status = acpi_ps_parse_aml(walk_state);