[3.5.y.z,extended,stable] Patch "net: count hw_addr syncs so that unsync works properly." has been added to staging queue

Message ID 1367451276-19998-1-git-send-email-luis.henriques@canonical.com
State New
Headers show

Commit Message

Luis Henriques May 1, 2013, 11:34 p.m.
This is a note to let you know that I have just added a patch titled

    net: count hw_addr syncs so that unsync works properly.

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From 727aeed3718b4357ed24435166a1c943432e9b51 Mon Sep 17 00:00:00 2001
From: Vlad Yasevich <vyasevic@redhat.com>
Date: Tue, 2 Apr 2013 17:10:07 -0400
Subject: [PATCH] net: count hw_addr syncs so that unsync works properly.

commit 4543fbefe6e06a9e40d9f2b28d688393a299f079 upstream.

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: Luis Henriques <luis.henriques@canonical.com>
 include/linux/netdevice.h | 2 +-
 net/core/dev_addr_lists.c | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)



diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index b52070a..735cb59 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -233,9 +233,9 @@  struct netdev_hw_addr {
-	bool			synced;
 	bool			global_use;
 	int			refcount;
+	int			synced;
 	struct rcu_head		rcu_head;

diff --git a/net/core/dev_addr_lists.c b/net/core/dev_addr_lists.c
index 716f363..fb898d7 100644
--- a/net/core/dev_addr_lists.c
+++ b/net/core/dev_addr_lists.c
@@ -38,7 +38,7 @@  static int __hw_addr_create_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);

@@ -164,7 +164,7 @@  int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
 					    addr_len, ha->type);
 			if (err)
-			ha->synced = true;
+			ha->synced++;
 		} else if (ha->refcount == 1) {
 			__hw_addr_del(to_list, ha->addr, addr_len, ha->type);
@@ -185,7 +185,7 @@  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);