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s390/cio: invalidate cdev pointer before deregistration

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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;