dma_devfn 124 drivers/tty/serial/8250/8250_lpss.c unsigned int dma_devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0); dma_devfn 125 drivers/tty/serial/8250/8250_lpss.c struct pci_dev *dma_dev = pci_get_slot(pdev->bus, dma_devfn);