iommu/dma: Move __iommu_dma_map
Moving this function up to its unmap counterpart helps to keep related code together for the following changes. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NRobin Murphy <robin.murphy@arm.com> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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