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s390/cio: invalidate cdev pointer before deregistration 

Make sure that the cdev pointer for IO subchannels is set to NULL when
we deregister the device (and release its last reference). This will
fix a bug were another process operates on an already freed ccw device.

Acked-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2012-09-05 14:20:41 +02:00 committed by Martin Schwidefsky
parent 43d0be75af
commit 3368ba25bf
1 changed files with 4 additions and 1 deletions
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5
drivers/s390/cio/device.c
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@ -1521,11 +1521,14 @@ static int io_subchannel_sch_event(struct subchannel *sch, int process)
goto out;
break;
case IO_SCH_UNREG_ATTACH:
spin_lock_irqsave(sch->lock, flags);
if (cdev->private->flags.resuming) {
/* Device will be handled later. */
rc = 0;
goto out;
goto out_unlock;
}
sch_set_cdev(sch, NULL);
spin_unlock_irqrestore(sch->lock, flags);
/* Unregister ccw device. */
ccw_device_unregister(cdev);
break;