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In some cases where the channel subsystem decides to drop a subchannel device device_unregister may be called twice, which results in an oops. The patch prevents this by only unregistering registered devices. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>