netdev - [net-next-2.6 PATCH 3/3] bridge: forbid slave devices to change it's type

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Date:	Tue, 9 Mar 2010 15:19:47 +0100
From:	Jiri Pirko <jpirko@...hat.com>
To:	netdev@...r.kernel.org
Cc:	fubar@...ibm.com, bonding-devel@...ts.sourceforge.net,
	davem@...emloft.net, shemminger@...ux-foundation.org
Subject: [net-next-2.6 PATCH 3/3] bridge: forbid slave devices to change it's
 type

It's not desired for underlaying devices to change type. At the time, there is
for example possible to have bond with changed type from Ethernet to Infiniband
as a port of a bridge. This patch fixes this.

Signed-off-by: Jiri Pirko <jpirko@...hat.com>
---
 net/bridge/br_notify.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/bridge/br_notify.c b/net/bridge/br_notify.c
index 763a3ec..a68c692 100644
--- a/net/bridge/br_notify.c
+++ b/net/bridge/br_notify.c
@@ -82,6 +82,9 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v
 	case NETDEV_UNREGISTER:
 		br_del_if(br, dev);
 		break;
+
+	case NETDEV_TYPE_CHNG_START:
+		return NOTIFY_BAD;
 	}
 
 	/* Events that may cause spanning tree to refresh */
-- 
1.6.6.1

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