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path: root/drivers/acpi/bus.c
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-rw-r--r--drivers/acpi/bus.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 4edff173857..d77c2307883 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -212,6 +212,12 @@ acpi_bus_set_power (
ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device is not power manageable\n"));
return_VALUE(-ENODEV);
}
+ /*
+ * Get device's current power state if it's unknown
+ * This means device power state isn't initialized or previous setting failed
+ */
+ if (device->power.state == ACPI_STATE_UNKNOWN)
+ acpi_bus_get_power(device->handle, &device->power.state);
if (state == device->power.state) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", state));
return_VALUE(0);
@@ -231,7 +237,7 @@ acpi_bus_set_power (
* On transitions to a high-powered state we first apply power (via
* power resources) then evalute _PSx. Conversly for transitions to
* a lower-powered state.
- */
+ */
if (state < device->power.state) {
if (device->power.flags.power_resources) {
result = acpi_power_transition(device, state);