From 593298e68a3a53bd2fe942244250dfef4d68d477 Mon Sep 17 00:00:00 2001
From: Aaron Lu <aaron.lu@intel.com>
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 <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
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;
}
--
2.34.1