[S390] cio: Fix reference counting for online/offline.

The current code attempts to get an extra reference count
for online devices by doing a get_device() in ccw_device_online()
and a put_device() in ccw_device_done(). However, this
- incorrectly obtains an extra reference for disconnected
  devices becoming available again (since they are already
  online)
- needs special checks for css_init_done in order to handle
  the console device
- is not obvious and
- may incorretly drop a reference count in ccw_device_done() if
  that function is called after path verification for a device
  that just became not operational.

So let's just get the reference in ccw_device_set_online() and
drop it in ccw_device_set_offline(). (Unfortunately, we still
need the special case in io_subchannel_probe().)

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

1 files changed, 0 insertions, 5 deletions

diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index 10bc03940fb3..01330cf5ae5e 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -399,9 +399,6 @@ ccw_device_done(struct ccw_device *cdev, int state)
                 ccw_device_oper_notify(cdev);
         }
         wake_up(&cdev->private->wait_q);
-
-        if (css_init_done && state != DEV_STATE_ONLINE)
-                put_device (&cdev->dev);
 }
 
 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
@@ -611,8 +608,6 @@ ccw_device_online(struct ccw_device *cdev)
             (cdev->private->state != DEV_STATE_BOXED))
                 return -EINVAL;
         sch = to_subchannel(cdev->dev.parent);
-        if (css_init_done && !get_device(&cdev->dev))
-                return -ENODEV;
         ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
         if (ret != 0) {
                 /* Couldn't enable the subchannel for i/o. Sick device. */