sparc64: move dereference after check for NULL
We shouldn't dereference "iommu" until after we have checked that it is
non-NULL.
Fixes: f08978b0fd
("sparc64: Enable sun4v dma ops to use IOMMU v2 APIs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -478,10 +478,9 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
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BUG_ON(direction == DMA_NONE);
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iommu = dev->archdata.iommu;
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atu = iommu->atu;
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if (nelems == 0 || !iommu)
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return 0;
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atu = iommu->atu;
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prot = HV_PCI_MAP_ATTR_READ;
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if (direction != DMA_TO_DEVICE)
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