btle 6lowpan races

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Hi Jukka,

I think it's bad for filling data for btle lowpan private data at point [0].
This is called after register_netdev and the rtnl_lock isn't hold after
calling "register_netdev" anymore which ends in a possible interface up
between register and filling lowpan_dev information. The result would be
that lowpan_dev is readed somewhere where it isn't filled.

The solution would be simple move the filling between alloc and register of
netdev.

If you like I can prepare patches for that.

Any thoughts on this?

- Alex

[0] http://lxr.free-electrons.com/source/net/bluetooth/6lowpan.c#L874
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