netdev - [PATCH net v2 3/9] bridge: Fix the way to find old local fdb entries in br_fdb_change_mac

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Date:	Tue, 17 Dec 2013 21:03:35 +0900
From:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
To:	"David S . Miller" <davem@...emloft.net>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Vlad Yasevich <vyasevic@...hat.com>, netdev@...r.kernel.org
Cc:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Subject: [PATCH net v2 3/9] bridge: Fix the way to find old local fdb entries in br_fdb_change_mac_address

We have been always failed to delete the old entry at
br_fdb_change_mac_address() because br_set_mac_address() updates
dev->dev_addr before calling br_fdb_change_mac_address() and
br_fdb_change_mac_address() uses dev->dev_addr to find the old entry.

That update of dev_addr is completely unnecessary because the same work
is done in br_stp_change_bridge_id() which is called right away after
calling br_fdb_change_mac_address().

Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
---
 net/bridge/br_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index f00cfd2..d967773 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -187,8 +187,8 @@ static int br_set_mac_address(struct net_device *dev, void *p)
 
 	spin_lock_bh(&br->lock);
 	if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
-		memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 		br_fdb_change_mac_address(br, addr->sa_data);
+		/* Mac address will be changed in br_stp_change_bridge_id(). */
 		br_stp_change_bridge_id(br, addr->sa_data);
 	}
 	spin_unlock_bh(&br->lock);
-- 
1.8.1.2

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