IB/ehca: Serialize hypervisor calls in ehca_register_mr()
Some pSeries hypervisor versions show a race condition in the allocate MR hCall. Serialize this call per adapter to circumvent this problem. Signed-off-by: NJoachim Fenkes <fenkes@de.ibm.com> Signed-off-by: NRoland Dreier <rolandd@cisco.com>
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