[S390] cio: fix ccw group device cleanup

Fix ccw group device initialization: initialize device object before
using reference counting during cleanup.

Fixes the following message when group device initialization fails
(e.g. because too few devices where specified):

  kobject: '<NULL>' (..): is not initialized, yet kobject_put() is
           being called.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 12 insertions, 8 deletions

diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index 26a930e832bd..e0ce65fca4e7 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -112,8 +112,10 @@ ccwgroup_release (struct device *dev)
         gdev = to_ccwgroupdev(dev);
 
         for (i = 0; i < gdev->count; i++) {
-                dev_set_drvdata(&gdev->cdev[i]->dev, NULL);
-                put_device(&gdev->cdev[i]->dev);
+                if (gdev->cdev[i]) {
+                        dev_set_drvdata(&gdev->cdev[i]->dev, NULL);
+                        put_device(&gdev->cdev[i]->dev);
+                }
         }
         kfree(gdev);
 }
@@ -221,6 +223,13 @@ int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
         atomic_set(&gdev->onoff, 0);
         mutex_init(&gdev->reg_mutex);
         mutex_lock(&gdev->reg_mutex);
+        gdev->creator_id = creator_id;
+        gdev->count = num_devices;
+        gdev->dev.bus = &ccwgroup_bus_type;
+        gdev->dev.parent = root;
+        gdev->dev.release = ccwgroup_release;
+        device_initialize(&gdev->dev);
+
         curr_buf = buf;
         for (i = 0; i < num_devices && curr_buf; i++) {
                 rc = __get_next_bus_id(&curr_buf, tmp_bus_id);
@@ -258,16 +267,11 @@ int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
                 rc = -EINVAL;
                 goto error;
         }
-        gdev->creator_id = creator_id;
-        gdev->count = num_devices;
-        gdev->dev.bus = &ccwgroup_bus_type;
-        gdev->dev.parent = root;
-        gdev->dev.release = ccwgroup_release;
 
         snprintf (gdev->dev.bus_id, BUS_ID_SIZE, "%s",
                         gdev->cdev[0]->dev.bus_id);
 
-        rc = device_register(&gdev->dev);
+        rc = device_add(&gdev->dev);
         if (rc)
                 goto error;
         get_device(&gdev->dev);