centos man page for pci_request_regions

PCI_REQUEST_REGIONS(9)						Hardware Interfaces					    PCI_REQUEST_REGIONS(9)

NAME
       pci_request_regions - Reserved PCI I/O and memory resources

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

ARGUMENTS
       pdev
	   PCI device whose resources are to be reserved

       res_name
	   Name to be associated with resource.

DESCRIPTION
       Mark all PCI regions associated with PCI device pdev 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_REGIONS(9)