etc/udev/redhat/05-udev-early.rules

   1 # sysfs is populated after the event is sent
   2 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
   3 ACTION=="add", SUBSYSTEM=="net", WAIT_FOR_SYSFS="address"
   4 ACTION=="add", SUBSYSTEM=="scsi", WAIT_FOR_SYSFS="ioerr_cnt"
   5
   6 # ignore these events until someone needs them
   7 SUBSYSTEM=="drivers",           OPTIONS="ignore_device"
   8 SUBSYSTEM=="module",            OPTIONS="ignore_device"
   9
  10 ACTION=="add", SUBSYSTEM=="firmware", ENV{FIRMWARE}=="*", RUN="/sbin/firmware_helper", OPTIONS="last_rule"