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>
This commit is contained in:
Aaron Lu 2013-08-03 21:13:22 +02:00 коммит произвёл Rafael J. Wysocki
Родитель 7b4e0c4ac1
Коммит 593298e68a
1 изменённых файлов: 3 добавлений и 1 удалений

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@ -179,7 +179,9 @@ int acpi_device_set_power(struct acpi_device *device, int state)
} }
if (device->parent && (state < device->parent->power.state)) { if (device->parent && (state < device->parent->power.state)) {
dev_warn(&device->dev, 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; return -ENODEV;
} }