[B.A.T.M.A.N.] bug - unregister_netdevice: usage_count = 1

Hi all,

I found a bug playing with my interfaces while bat0 was active. The bug is described here: http://www.open-mesh.org/issues/148 The steps to reproduce it are reported too.

In a few words, when trying to unregister a device by unloading its module, the modprobe hangs and in the dmesg I can see this message:

unregister_netdevice: waiting for wlan0 to become free. Usage count = 1

I tried to do some tests and what I observed is that hard_iface->refcount doesn't reach 0. This means that hard_iface_free_rcu() is never invoked and dev_put() too.

I hope the information are enough..

Regards,