udev rules time out and firmware of NICs fail to load at boot in Red Hat Enterprise Linux 6.

Issue

• Firmware fails to load and some udev rules time out.
• The following logs can be seen on console :

Starting udev:
udevadm settle - timeout of 180 seconds reached, the event queue contains:

udevd[11136]: worker [13191] failed while handling '/devices/pci0000:00/0000:00:03.2/0000:04:00.1/host2/rport-2:0-4/target2:0:2/2:0:2:31/scsi_device/2:0:2:31'
udevd[11136]: worker [13192] unexpectedly returned with status 0x0100