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PCI_REQUEST_REGION_E(9)	      Hardware Interfaces      PCI_REQUEST_REGION_E(9)

NAME
       pci_request_region_exclusive - Reserved PCI I/O and memory resource

SYNOPSIS
       int pci_request_region_exclusive(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 BR 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.

       The key difference that _exclusive makes it that userspace is
       explicitly not allowed to map the resource via /dev/mem or sysfs.

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013	       PCI_REQUEST_REGION_E(9)

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