IOMMU Fixes for Linux v4.6-rc4 The fixes include: * Two patches to revert the use of default domains in the ARM SMMU driver. Enabling this caused regressions which need more thorough fixing. So the regressions are fixed for now by disabling the use of default domains. * A fix for a v4.4 regression in the AMD IOMMU driver which broke devices behind invisible PCIe-to-PCI bridges with IOMMU enabled.