pci_create_legacy_files — create legacy I/O port and memory files
|struct pci_bus * b|
Some platforms allow access to legacy I/O port and ISA memory space on a per-bus basis. This routine creates the files and ties them into their associated read, write and mmap files from pci-sysfs.c
On error unwind, but don't propagate the error to the caller as it is ok to set up the PCI bus without these files.