[PATCH] acpi: handle the acpi hotplug schedule error

[Lee, Chun-Yi]

Kernel should decrements the reference count of acpi device
when scheduling acpi hotplug work is failed, and also evaluates
_OST to notify BIOS the failure.

Cc: "Rafael J. Wysocki" <r...@rjwysocki.net>
Cc: Len Brown <l...@kernel.org>
Signed-off-by: "Lee, Chun-Yi" <j...@suse.com>
---
 drivers/acpi/bus.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 34fbe02..2f2cec9 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -427,8 +427,14 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, 
void *data)
            (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
                driver->ops.notify(adev, type);
 
-       if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
-               return;
+       if (hotplug_event) {
+               if (ACPI_FAILURE(acpi_hotplug_schedule(adev, type))) {
+                       acpi_bus_put_acpi_device(adev);
+                       goto err;
+               } else {
+                       return;
+               }
+       }
 
        acpi_bus_put_acpi_device(adev);
        return;
-- 
2.10.2