WD_IO_EXTENT
release_region(base_addr, WD_IO_EXTENT);
r = request_region(ioaddr, WD_IO_EXTENT, "wd-probe");
release_region(ioaddr, WD_IO_EXTENT);
release_region(dev->base_addr - WD_NIC_OFFSET, WD_IO_EXTENT);
r = request_region(base_addr, WD_IO_EXTENT, "wd-probe");