pci_enable_device_io(9) centos man page | unix.com

PCI_ENABLE_DEVICE_IO(9) 					Hardware Interfaces					   PCI_ENABLE_DEVICE_IO(9)

NAME
       pci_enable_device_io - Initialize a device for use with IO space

SYNOPSIS
       int pci_enable_device_io(struct pci_dev * dev);

ARGUMENTS
       dev
	   PCI device to be initialized

DESCRIPTION
       Initialize device before it's used by a driver. Ask low-level code to enable I/O resources. Wake up the device if it was suspended. Beware,
       this function can fail.

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Kernel Hackers Manual 3.10					     June 2014						   PCI_ENABLE_DEVICE_IO(9)