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

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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 committed by Rafael J. Wysocki
parent 7b4e0c4ac1
commit 593298e68a
1 changed files with 3 additions and 1 deletions
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4
drivers/acpi/device_pm.c
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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)) {
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;
}