pcitool_cfg_access
rval = pcitool_cfg_access(&prg, write_flag, cfgspace_io);
rval = pcitool_cfg_access(&cfg, B_FALSE, cfgspace_io);
rval = pcitool_cfg_access(&cfg, B_FALSE, cfgspace_io);
static int pcitool_cfg_access(pcitool_reg_t *prg, boolean_t write_flag,
int ret = pcitool_cfg_access(cfg, B_FALSE, cfg_io);