This is a note to let you know that I've just added the patch titled
bridge: fix race with topology change timer
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bridge-fix-race-with-topology-change-timer.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 471842a45ef380de09b74cbd4b09f7d6f202dfc7 Mon Sep 17 00:00:00 2001
From: stephen hemminger <stephen@xxxxxxxxxxxxxxxxxx>
Date: Thu, 2 May 2013 14:23:28 +0000
Subject: bridge: fix race with topology change timer
From: stephen hemminger <stephen@xxxxxxxxxxxxxxxxxx>
[ Upstream commit 83401eb4990ff6af55aeed8f49681558544192e6 ]
A bridge should only send topology change notice if it is not
the root bridge. It is possible for message age timer to elect itself
as a new root bridge, and still have a topology change timer running
but waiting for bridge lock on other CPU.
Solve the race by checking if we are root bridge before continuing.
This was the root cause of the cases where br_send_tcn_bpdu would OOPS.
Reported-by: JerryKang <jerry.kang@xxxxxxxxxxx>
Signed-off-by: Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/bridge/br_stp_timer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/bridge/br_stp_timer.c
+++ b/net/bridge/br_stp_timer.c
@@ -107,7 +107,7 @@ static void br_tcn_timer_expired(unsigne
br_debug(br, "tcn timer expired\n");
spin_lock(&br->lock);
- if (br->dev->flags & IFF_UP) {
+ if (!br_is_root_bridge(br) && (br->dev->flags & IFF_UP)) {
br_transmit_tcn(br);
mod_timer(&br->tcn_timer,jiffies + br->bridge_hello_time);
Patches currently in stable-queue which might be from stephen@xxxxxxxxxxxxxxxxxx are
queue-3.4/bridge-fix-race-with-topology-change-timer.patch
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