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net: count hw_addr syncs so that unsync works properly.

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[ Upstream commit 4543fbefe6 ]

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vlad Yasevich 2013-04-02 17:10:07 -04:00 committed by Greg Kroah-Hartman
parent ef95e3d5d7
commit 617f13b419
2 changed files with 4 additions and 4 deletions
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2
include/linux/netdevice.h
View file

@ -232,9 +232,9 @@ struct netdev_hw_addr {
#define NETDEV_HW_ADDR_T_SLAVE 3
#define NETDEV_HW_ADDR_T_UNICAST 4
#define NETDEV_HW_ADDR_T_MULTICAST 5
bool synced;
bool global_use;
int refcount;
int synced;
struct rcu_head rcu_head;
};

6
net/core/dev_addr_lists.c
View file

@ -57,7 +57,7 @@ static int __hw_addr_add_ex(struct netdev_hw_addr_list *list,
ha->type = addr_type;
ha->refcount = 1;
ha->global_use = global;
ha->synced = false;
ha->synced = 0;
list_add_tail_rcu(&ha->list, &list->list);
list->count++;
return 0;
@ -155,7 +155,7 @@ int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
addr_len, ha->type);
if (err)
break;
ha->synced = true;
ha->synced++;
ha->refcount++;
} else if (ha->refcount == 1) {
__hw_addr_del(to_list, ha->addr, addr_len, ha->type);
@ -176,7 +176,7 @@ void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
if (ha->synced) {
__hw_addr_del(to_list, ha->addr,
addr_len, ha->type);
ha->synced = false;
ha->synced--;
__hw_addr_del(from_list, ha->addr,
addr_len, ha->type);
}