Re: 2.6.7-rc3: unregister_netdevice: waiting for tun0 to become free. Usage count = 1

["David S. Miller" <davem@xxxxxxxxxx>]

On Thu, 17 Jun 2004 21:24:49 +0400
Alexey Kuznetsov <kuznet@xxxxxxxxxxxxx> wrote:

> Actually, he noticed right thing. I forgot that this function
> works in context when dev, which is argument is of the function,
> is held, so dev_put() here can be safely replaced with __dev_put().
> 
> So, synchonize_kernel() can be moved somewhere to unregister_netdevice(),
> (maybe, it is already present there under surface)

It occurs, via synchronize_net(), but this happens before NETDEV_UNREGISTER
event is sent out.  Is it sufficient?  I think not, and that we need to
add another call in unregister_netdevice() right before final dev_put().