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Receive buffers need to be mapped with DMA_FROM_DEVICE. Incorrectly mapping with DMA_TO_DEVICE causes a hard lock on ppc64 machines with an IOMMU. This fixes <https://bugs.openfabrics.org/show_bug.cgi?id=431> Signed-off-by: Michael S. Tsirkin <mst@dev.mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>