[PATCH RESEND] iommu/dma: Use correct offset in map_sg

[Joerg Roedel]

On Mon, Jan 04, 2016 at 04:19:42PM +0000, Robin Murphy wrote:
> When mapping a non-page-aligned scatterlist entry, we copy the original
> offset to the output DMA address before aligning it to hand off to
> iommu_map_sg(), then later adding the IOVA page address portion to get
> the final mapped address. However, when the IOVA page size is smaller
> than the CPU page size, it is the offset within the IOVA page we want,
> not that within the CPU page, which can easily be larger than an IOVA
> page and thus result in an incorrect final address.
> 
> Fix the bug by taking only the IOVA-aligned part of the offset as the
> basis of the DMA address, not the whole thing.
> 
> Signed-off-by: Robin Murphy <robin.murphy at arm.com>

Applied, thanks.