From 593298e68a3a53bd2fe942244250dfef4d68d477 Mon Sep 17 00:00:00 2001 From: Aaron Lu Date: Sat, 3 Aug 2013 21:13:22 +0200 Subject: [PATCH] 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 Signed-off-by: Rafael J. Wysocki --- drivers/acpi/device_pm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index beb9625e8458..59d3202f6b36 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -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; }