pci_request_region — Reserved PCI I/O and memory resource
PCI device whose resources are to be reserved
BAR to be reserved
Name to be associated with resource.
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.