"register_netdevice+0x1eb/0x450()" messages appears for the broadcome "tg3" based NICs in the system running on RHEL6.6 release.

Issue

• We have recently update the underlying firmware of our server and have update the network drivers.
• After reboot system is getting some of the following message for the interfaces, though system is up and running:

 kernel: WARNING: at net/core/dev.c:6325 register_netdevice+0x1eb/0x450() (Not tainted)
 kernel: Hardware name: ProLiant DL380p Gen8
 kernel: Pid: 807, comm: work_for_cpu Not tainted 2.6.32-504.16.2.el6.x86_64 #1
 kernel: Call Trace:
 kernel: [<ffffffff81074e27>] ? warn_slowpath_common+0x87/0xc0
 kernel: [<ffffffff81074e7a>] ? warn_slowpath_null+0x1a/0x20
 kernel: [<ffffffff814605fb>] ? register_netdevice+0x1eb/0x450
 kernel: [<ffffffff8146089f>] ? register_netdev+0x3f/0x60
 kernel: [<ffffffffa021aa6d>] ? tg3_init_one+0x1502/0x1c97 [tg3]
 kernel: [<ffffffff81098530>] ? do_work_for_cpu+0x0/0x30
 kernel: [<ffffffff812af3c7>] ? local_pci_probe+0x17/0x20
 kernel: [<ffffffff81098548>] ? do_work_for_cpu+0x18/0x30
 kernel: [<ffffffff8109e71e>] ? kthread+0x9e/0xc0
 kernel: [<ffffffff8100c20a>] ? child_rip+0xa/0x20

• Why do such messages appears in the setup after update?