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path: root/drivers/acpi/device_pm.c
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Diffstat (limited to 'drivers/acpi/device_pm.c')
-rw-r--r--drivers/acpi/device_pm.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index a94383d1f35..d42b2fb5a7e 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -118,9 +118,10 @@ int acpi_device_get_power(struct acpi_device *device, int *state)
/*
* If we were unsure about the device parent's power state up to this
* point, the fact that the device is in D0 implies that the parent has
- * to be in D0 too.
+ * to be in D0 too, except if ignore_parent is set.
*/
- if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
+ if (!device->power.flags.ignore_parent && device->parent
+ && device->parent->power.state == ACPI_STATE_UNKNOWN
&& result == ACPI_STATE_D0)
device->parent->power.state = ACPI_STATE_D0;
@@ -177,7 +178,8 @@ int acpi_device_set_power(struct acpi_device *device, int state)
acpi_power_state_string(state));
return -ENODEV;
}
- if (device->parent && (state < device->parent->power.state)) {
+ if (!device->power.flags.ignore_parent &&
+ device->parent && (state < device->parent->power.state)) {
dev_warn(&device->dev,
"Cannot transition to power state %s for parent in %s\n",
acpi_power_state_string(state),