tree 1391190938fb43587967f44f0ab139a2522b4a65
parent 24023451c8df726692e2f52288a20870d13b501f
author Patrick McHardy <kaber@trash.net> 1184464322 -0700
committer David S. Miller <davem@davemloft.net> 1184464322 -0700

[NET]: dev_mcast: add multicast list synchronization helpers

The method drivers currently use to synchronize multicast lists is not
very pretty:

- walk the multicast list
- search each entry on a copy of the previous list
- if new add to lower device
- walk the copy of the previous list
- search each entry on the current list
- if removed delete from lower device
- copy entire list

This patch adds a new field to struct dev_addr_list to store the
synchronization state and adds two helper functions for synchronization
and cleanup.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>