A HBA has detected a LOOP DOWN condition, how can I reset the HBA?

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Issue

One HBA is reporting the loop it's attached to as down:

 qla2400 0000:0b:00.0: LOOP DOWN detected (2 6 0).

multipath -ll shows that all multipathed devices are available through one path only.
How can we re-enable the link?

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
SAN attached server

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