[PATCHv9 08/25] v4l: vb2-dma-contig: add support for scatterlist in userptr mode

This patch introduces usage of dma_map_sg to map memory behind a userspace pointer to a device as dma-contiguous mapping. This patch contains some of the code kindly provided by Marek Szyprowski and Kamil Debski and Andrzej Pietrasiewicz . Kind thanks for bug reports from Laurent Pinchart and

[PATCHv9 08/25] v4l: vb2-dma-contig: add support for scatterlist in userptr mode

This patch introduces usage of dma_map_sg to map memory behind a userspace pointer to a device as dma-contiguous mapping. This patch contains some of the code kindly provided by Marek Szyprowski and Kamil Debski and Andrzej Pietrasiewicz . Kind thanks for bug reports from Laurent Pinchart and S