On Mon, Mar 18, 2019 at 06:39:30PM +0300, Andy Shevchenko wrote: > Intel IOMMU, when enabled, tries to find the domain of the device, > assuming it's a PCI one, during DMA operations, such as mapping or > unmapping. Since we are splitting the actual PCI device to couple of > children via MFD framework (see drivers/mfd/intel-lpss.c for details), > the DMA device appears to be a platform one, and thus not an actual one > that performs DMA. In a such situation IOMMU can't find or allocate > a proper domain for its operations. As a result, all DMA operations are > failed. > > In order to fix this, supply parent of the platform device > to the DMA engine framework and fix filter functions accordingly. > > We may rely on the fact that parent is a real PCI device, because no > other configuration is present in the wild. > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> For the tty/serial/ portion: Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
