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ACPICA: Update comments about behavior when _STA does not exist

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No functional change.  Add some comments concerning behavior
when the _STA method does not exist. According to the ACPI
specification, in this case the device should be assumed to be
present, functional, and enabled.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Acked-by: Len Brown <len.brown@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Bob Moore 2013-07-17 09:48:15 +08:00 committed by Rafael J. Wysocki
parent 3b2f64d00c
commit a7d5caf6d2
2 changed files with 13 additions and 2 deletions
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7
drivers/acpi/acpica/nsxfname.c
View File

@ -379,9 +379,14 @@ acpi_get_object_info(acpi_handle handle,
* Get extra info for ACPI Device/Processor objects only:
* Run the _STA, _ADR and, sx_w, and _sx_d methods.
*
* Note: none of these methods are required, so they may or may
* Notes: none of these methods are required, so they may or may
* not be present for this device. The Info->Valid bitfield is used
* to indicate which methods were found and run successfully.
*
* For _STA, if the method does not exist, then (as per the ACPI
* specification), the returned current_status flags will indicate
* that the device is present/functional/enabled. Otherwise, the
* current_status flags reflect the value returned from _STA.
*/
/* Execute the Device._STA method */

8
drivers/acpi/acpica/uteval.c
View File

@ -239,7 +239,8 @@ acpi_ut_evaluate_numeric_object(char *object_name,
* RETURN: Status
*
* DESCRIPTION: Executes _STA for selected device and stores results in
* *Flags.
* *Flags. If _STA does not exist, then the device is assumed
* to be present/functional/enabled (as per the ACPI spec).
*
* NOTE: Internal function, no parameter validation
*
@ -257,6 +258,11 @@ acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags)
ACPI_BTYPE_INTEGER, &obj_desc);
if (ACPI_FAILURE(status)) {
if (AE_NOT_FOUND == status) {
/*
* if _STA does not exist, then (as per the ACPI specification),
* the returned flags will indicate that the device is present,
* functional, and enabled.
*/
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"_STA on %4.4s was not found, assuming device is present\n",
acpi_ut_get_node_name(device_node)));