IB/mlx4: Check if GRH is available before using it
Before reading GRH attributes, need to make sure AH contains GRH, and in addition, initialize GID type. Fixes: dbf727de ('IB/core: Use GID table in AH creation and dmac resolution') Signed-off-by: NEran Ben Elisha <eranbe@mellanox.com> Signed-off-by: NDaniel Jurgens <danielj@mellanox.com> Reviewed-by: NMark Bloch <markb@mellanox.com> Signed-off-by: NLeon Romanovsky <leon@kernel.org> Signed-off-by: NDoug Ledford <dledford@redhat.com>
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