Commit 593298e6 authored Aug 03, 2013 by Aaron Lu Committed by Rafael J. Wysocki Aug 03, 2013

ACPI / PM: Add state information to error message in acpi_device_set_power()



The state information can be useful to know what the problem is when
an error message about a device can not being set to a higher power
state than its parent appeared, so this patch adds such state
information for both the target state of the device and the current
state of its parent.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 7b4e0c4a

drivers/acpi/device_pm.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -179,7 +179,9 @@ int acpi_device_set_power(struct acpi_device *device, int state)
		}
		if (device->parent && (state < device->parent->power.state)) {
		dev_warn(&device->dev,
		"Cannot transition to a higher-powered state than parent\n");
		"Cannot transition to power state %s for parent in %s\n",
		acpi_power_state_string(state),
		acpi_power_state_string(device->parent->power.state));
		return -ENODEV;
		}