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sparc64: move dereference after check for NULL

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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>
This commit is contained in:
Dan Carpenter 2016-11-25 14:01:32 +03:00 committed by David S. Miller
parent b1ebb97550
commit efca4885b5
1 changed files with 2 additions and 3 deletions
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5
arch/sparc/kernel/pci_sun4v.c
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@ -478,11 +478,10 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
BUG_ON(direction == DMA_NONE);
iommu = dev->archdata.iommu;
atu = iommu->atu;
if (nelems == 0 || !iommu)
return 0;
atu = iommu->atu;
prot = HV_PCI_MAP_ATTR_READ;
if (direction != DMA_TO_DEVICE)
prot |= HV_PCI_MAP_ATTR_WRITE;