Reserve pci i/o and memory resource
int pci_request_region(struct pci_dev * pdev, int bar, const char * res_name);
pdev
PCI device whose resources are to be reserved
bar
BAR to be reserved
res_name
Name to be associated with resource
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.