Dependency between interfaces

[Brooks Davis]

On Thu, Oct 20, 2005 at 08:20:34PM +0000, Wojciech A. Koszek wrote:
> Hello,
> 
> Is EVENTHANDLER(9) proper way of notification for standalone driver about
> network interface attach/detach operations? I've met simple problem in
> ef(4), which causes machine freeze in following situation: load NIC driver
> -> load if_ef -> unload NIC driver -> some activity with interface.
> Althought driver of network interface no longer exists, if_ef does not know
> about it and continues it's operation.
> 
> I've seen similar situation for example in ng_fec(4): piece of code needs to
> call some cleanup routines in order to keep pointers in valid state. I think
> this situation is almost the same like this current in if_bridge(4). Just
> repeat situation described above for ef(4), but with if_bridge(4).

It looks like you could hook into the ifnet_departure_event pretty
easily.  The one gotcha is that it's called during interface renames so
you need to consider that possibility.

-- Brooks

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