s390/qeth: do basic setup for data channel
The data channel currently doesn't need a setup operation, because we don't use pre-allocated cmd buffers for its IO. But subsequent changes will introduce further setup that also applies to the data channel. This refactors things a bit, so that the new stuff can then be automatically applied to all channels. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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