s390/qeth: use callback to finalize cmd
To avoid concurrency issues, some parts of the cmd setup are delayed until qeth_send_control_data() holds the IO channel's irq_pending "lock". Rather than hard-coding those setup steps for each cmd type, have the cmd provide a callback. This will make it easier to also issue IDX commands via qeth_send_control_data(). Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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