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When performing DMA operations on a MCB device, the device needed for using the DMA API is "mcb_device->bus_carrier". This is rather lengthy, so a shortcut is introduced to struct mcb_device in order to ensure the MCB device driver uses the correct device for DMA operations. Signed-off-by: Michael Moese <[email protected]> Signed-off-by: Johannes Thumshirn <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>