From: Eric Dumazet <dada1@cosmosbay.com>
Date: Wed, 15 Apr 2009 11:27:50 +0200

quoted text
> Since you obviously need a write lock here to be sure following
> can be done by one cpu only.
> 
> You have same problem all over this patch.

RTNL semaphore is held across all modification operations.
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