Getting unregister_netdevice: waiting for eth0 to become free. Usage count = 4 error

[Vishwas Srivastava]

Hi All,
            When i am trying to delete an interface from the application,
while traffic is flowing through it, kernel throws the message

unregister_netdevice: waiting for eth0 to become free. Usage count = 4

which means network device usage counter is more that zero and there are 4
references of this device still active, therefore the networking subsystem
of the kernel
defers it, to become the usage counter 0.

Can somebody let me know what are the operations/ events increases the
reference count of any network device.

I looked in to the kernel code and found that a call to
"dev_hold" increases the refrence count and
"dev_put" decreases this.

thanks,
Vishwas S
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