On Mon, Jun 03, 2013 at 01:51:58PM -0700, Ethan Jackson wrote:
> If ofproto decided to change the netdev of a particular ofport,
> cfm_demand mode would improperly continue using the old netdev to
> collect stats.
> 
> Bug #17583.
> Signed-off-by: Ethan Jackson <[email protected]>

The refcounting saved us here.  Without refcounting, this would have
been a segfault instead of just bad stats.  Yay.
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