IB/ipath: Prevent random program use of diags interface
To prevent random utility reads and writes of the diag interface to the chip, we first require a handshake of reading from offset 0 and writing to offset 0 before any other reads or writes can be done through the diags device. Otherwise chip errors can be triggered. Signed-off-by: NDave Olson <dave.olson@qlogic.com> Signed-off-by: NBryan O'Sullivan <bryan.osullivan@qlogic.com> Signed-off-by: NRoland Dreier <rolandd@cisco.com>
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