[S390] cio: fix unreg race in set_online path

In ccw_device_set_online we basically start path verification and
wait for the device to reach a final state. If it turns out that the
device has no useable path we schedule the deregistration of the
device (which is still in an non-final state) and wake up the waiting
process. The deregistration process will set a final state, but if
the wake up happens to be prior to this, the device will hang forever
in ccw_device_set_online.

To fix this just set the final NOT_OPER state prior to the scheduled
deregistration of the device.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index 6084103672b5..e087a8685f95 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -408,9 +408,10 @@ ccw_device_done(struct ccw_device *cdev, int state)
                 CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel "
                               "%04x\n", cdev->private->dev_id.devno,
                               sch->schid.sch_no);
-                if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK)
+                if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) {
+                        cdev->private->state = DEV_STATE_NOT_OPER;
                         ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
-                else
+                } else
                         ccw_device_set_disconnected(cdev);
                 cdev->private->flags.donotify = 0;
                 break;