[PATCH v4 1/9] ACPI / PM: Let acpi_dev_pm_detach() return an error code

[Ulf Hansson]

To give callers the option of acting on a errors while removing the
pm_domain ops for the device in the ACPI PM domain, let
acpi_dev_pm_detach() return an int to provide the error code.

Signed-off-by: Ulf Hansson <ulf.hansson at linaro.org>
Tested-by: Philipp Zabel <p.zabel at pengutronix.de>
Acked-by: Pavel Machek <Pavel at ucw.cz>
Reviewed-by: Kevin Hilman <khilman at linaro.org>
---
 drivers/acpi/device_pm.c | 8 +++++++-
 include/linux/acpi.h     | 7 +++++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index 67075f8..0d52ce1 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -1055,6 +1055,8 @@ static struct dev_pm_domain acpi_general_pm_domain = {
  *
  * Callers must ensure proper synchronization of this function with power
  * management callbacks.
+ *
+ * Returns 0 on successfully attached PM domain or negative error code.
  */
 int acpi_dev_pm_attach(struct device *dev, bool power_on)
 {
@@ -1087,8 +1089,10 @@ EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);
  *
  * Callers must ensure proper synchronization of this function with power
  * management callbacks.
+ *
+ * Returns 0 on successfully detached PM domain or negative error code.
  */
-void acpi_dev_pm_detach(struct device *dev, bool power_off)
+int acpi_dev_pm_detach(struct device *dev, bool power_off)
 {
 	struct acpi_device *adev = ACPI_COMPANION(dev);
 
@@ -1107,7 +1111,9 @@ void acpi_dev_pm_detach(struct device *dev, bool power_off)
 			acpi_device_wakeup(adev, ACPI_STATE_S0, false);
 			acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
 		}
+		return 0;
 	}
+	return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(acpi_dev_pm_detach);
 #endif /* CONFIG_PM */
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 807cbc4..c83cca5 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -587,7 +587,7 @@ static inline int acpi_subsys_freeze(struct device *dev) { return 0; }
 #if defined(CONFIG_ACPI) && defined(CONFIG_PM)
 struct acpi_device *acpi_dev_pm_get_node(struct device *dev);
 int acpi_dev_pm_attach(struct device *dev, bool power_on);
-void acpi_dev_pm_detach(struct device *dev, bool power_off);
+int acpi_dev_pm_detach(struct device *dev, bool power_off);
 #else
 static inline struct acpi_device *acpi_dev_pm_get_node(struct device *dev)
 {
@@ -597,7 +597,10 @@ static inline int acpi_dev_pm_attach(struct device *dev, bool power_on)
 {
 	return -ENODEV;
 }
-static inline void acpi_dev_pm_detach(struct device *dev, bool power_off) {}
+static inline int acpi_dev_pm_detach(struct device *dev, bool power_off)
+{
+	return -ENODEV;
+}
 #endif
 
 #ifdef CONFIG_ACPI
-- 
1.9.1