net: count hw_addr syncs so that unsync works properly.
authorVlad Yasevich <vyasevic@redhat.com>
Tue, 2 Apr 2013 21:10:07 +0000 (17:10 -0400)
committerBen Hutchings <ben@decadent.org.uk>
Mon, 13 May 2013 14:02:35 +0000 (15:02 +0100)
commitc8b2a1ad3630f35394bc23595cfa075d60c81f18
tree4e61bbbf2fd9fd205f1703132e10158cd58a3aae
parentc1e0fcf7ab8dfdec5a752482880900bcfd7b9527
net: count hw_addr syncs so that unsync works  properly.

[ Upstream commit 4543fbefe6e06a9e40d9f2b28d688393a299f079 ]

A few drivers use dev_uc_sync/unsync to synchronize the
address lists from master down to slave/lower devices.  In
some cases (bond/team) a single address list is synched down
to multiple devices.  At the time of unsync, we have a leak
in these lower devices, because "synced" is treated as a
boolean and the address will not be unsynced for anything after
the first device/call.

Treat "synced" as a count (same as refcount) and allow all
unsync calls to work.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
include/linux/netdevice.h
net/core/dev_addr_lists.c