centos man page for pci_request_region

PCI_REQUEST_REGION(9)						Hardware Interfaces					     PCI_REQUEST_REGION(9)

NAME
       pci_request_region - Reserve PCI I/O and memory resource

SYNOPSIS
       int pci_request_region(struct pci_dev * pdev, int bar, const char * res_name);

ARGUMENTS
       pdev
	   PCI device whose resources are to be reserved

       bar
	   BAR to be reserved

       res_name
	   Name to be associated with resource

DESCRIPTION
       Mark the PCI region associated with PCI device pdev BAR bar as being reserved by owner res_name. Do not access any address inside the PCI
       regions unless this call returns successfully.

       Returns 0 on success, or EBUSY on error. A warning message is also printed on failure.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						     PCI_REQUEST_REGION(9)