2 files changed, 4 insertions, 1 deletions

diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index e0ce65fca4e7..9a50f245774b 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -113,7 +113,8 @@ ccwgroup_release (struct device *dev)
 
         for (i = 0; i < gdev->count; i++) {
                 if (gdev->cdev[i]) {
-                        dev_set_drvdata(&gdev->cdev[i]->dev, NULL);
+                        if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev)
+                                dev_set_drvdata(&gdev->cdev[i]->dev, NULL);
                         put_device(&gdev->cdev[i]->dev);
                 }
         }
@@ -296,6 +297,7 @@ error:
                         if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev)
                                 dev_set_drvdata(&gdev->cdev[i]->dev, NULL);
                         put_device(&gdev->cdev[i]->dev);
+                        gdev->cdev[i] = NULL;
                 }
         mutex_unlock(&gdev->reg_mutex);
         put_device(&gdev->dev);
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 5954b905e3ca..326f4cc7f92c 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -174,6 +174,7 @@ cio_start_key (struct subchannel *sch,	/* subchannel structure */
         CIO_TRACE_EVENT(4, sch->dev.bus_id);
 
         orb = &to_io_private(sch)->orb;
+        memset(orb, 0, sizeof(union orb));
         /* sch is always under 2G. */
         orb->cmd.intparm = (u32)(addr_t)sch;
         orb->cmd.fmt = 1;