[S390] cio: Fix refcount after moving devices.

In ccw_device_move_to_orphanage(), a replacing ccw_device
is searched via get_{disc,orphaned}_ccwdev_by_dev_id()
which obtain a reference on the returned ccw_device.
This reference must be given up again after the device
has been moved to its new parent.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 4e78c82194b..4e4008325e2 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -874,11 +874,15 @@ void ccw_device_move_to_orphanage(struct work_struct *work)
         replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev);
         if (replacing_cdev) {
                 sch_attach_disconnected_device(sch, replacing_cdev);
+                /* Release reference from get_disc_ccwdev_by_dev_id() */
+                put_device(&cdev->dev);
                 return;
         }
         replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id);
         if (replacing_cdev) {
                 sch_attach_orphaned_device(sch, replacing_cdev);
+                /* Release reference from get_orphaned_ccwdev_by_dev_id() */
+                put_device(&cdev->dev);
                 return;
         }
         sch_create_and_recog_new_device(sch);