Commit 402ac536 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Len Brown
Browse files

ACPI: add acpi_bus_get_status_handle()

Add acpi_bus_get_status_handle() so we can get the status of a namespace
object before building a struct acpi_device.

This removes a use of "device->flags.dynamic_status", a cached indicator of
whether _STA exists.  It seems simpler and more reliable to just evaluate
_STA and catch AE_NOT_FOUND errors.
Signed-off-by: default avatarBjorn Helgaas <>
Signed-off-by: default avatarLen Brown <>
parent 51a85faf
......@@ -94,36 +94,33 @@ int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
int acpi_bus_get_status(struct acpi_device *device)
acpi_status acpi_bus_get_status_handle(acpi_handle handle,
unsigned long long *sta)
acpi_status status = AE_OK;
unsigned long long sta = 0;
acpi_status status;
status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
if (ACPI_SUCCESS(status))
return AE_OK;
if (!device)
return -EINVAL;
if (status == AE_NOT_FOUND) {
return AE_OK;
return status;
* Evaluate _STA if present.
if (device->flags.dynamic_status) {
status =
acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
int acpi_bus_get_status(struct acpi_device *device)
acpi_status status;
unsigned long long sta;
status = acpi_bus_get_status_handle(device->handle, &sta);
if (ACPI_FAILURE(status))
return -ENODEV;
STRUCT_TO_INT(device->status) = (int)sta;
* According to ACPI spec some device can be present and functional
* even if the parent is not present but functional.
* In such conditions the child device should not inherit the status
* from the parent.
STRUCT_TO_INT(device->status) =
STRUCT_TO_INT(device->status) = (int) sta;
if (device->status.functional && !device->status.present) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
......@@ -135,10 +132,8 @@ int acpi_bus_get_status(struct acpi_device *device)
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
(u32) STRUCT_TO_INT(device->status)));
return 0;
void acpi_bus_private_data_handler(acpi_handle handle,
......@@ -322,6 +322,8 @@ extern void unregister_acpi_bus_notifier(struct notifier_block *nb);
int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device);
void acpi_bus_data_handler(acpi_handle handle, void *context);
acpi_status acpi_bus_get_status_handle(acpi_handle handle,
unsigned long long *sta);
int acpi_bus_get_status(struct acpi_device *device);
int acpi_bus_get_power(acpi_handle handle, int *state);
int acpi_bus_set_power(acpi_handle handle, int state);
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