pcim_request_region
ret = pcim_request_region(pdev, 0, "vboxvideo");
err = pcim_request_region(pdev, SMBBAR, ismt_driver.name);
err = pcim_request_region(pdev, 0, pci_name(pdev));
EXPORT_SYMBOL(pcim_request_region);
ret = pcim_request_region(pdev, bar, name);
retval = pcim_request_region(pdev, 2, "mxser(IO)");
retval = pcim_request_region(pdev, 3, "mxser(vector)");
int pcim_request_region(struct pci_dev *pdev, int bar, const char *name);