s390/qeth: lock the card while changing its hsuid
qeth_l3_dev_hsuid_store() initially checks the card state, but doesn't take the conf_mutex to ensure that the card stays in this state while being reconfigured. Rework the code to take this lock, and drop a redundant state check in a helper function. Fixes: b3332930 ("qeth: add support for af_iucv HiperSockets transport") Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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