IB/mthca: don't change driver's copy of attributes if modify QP fails
Only change the driver's copy of the QP attributes in modify QP after checking the modify QP command completed successfully. Signed-off-by: NJack Morgenstein <jackm@mellanox.co.il> Signed-off-by: NMichael S. Tsirkin <mst@mellanox.co.il> Signed-off-by: NRoland Dreier <rolandd@cisco.com>
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