Varun Prakash 165ae50e45 scsi: libcxgbi: return error if interface is not up
Do not post hw active open cmd if IFF_UP is not set or link is down on
the interface, return -ENETDOWN in this case.

Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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