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authorstephen hemminger <stephen@networkplumber.org>2013-05-02 14:23:28 +0000
committerDavid S. Miller <davem@davemloft.net>2013-05-03 16:08:58 -0400
commit83401eb4990ff6af55aeed8f49681558544192e6 (patch)
tree03ffd894cf160fdd0f87e63a4136810cf6275e2b
parent488fc9af8267d0cd9036bc9db9f5dbbfde6de208 (diff)
downloadblackbird-op-linux-83401eb4990ff6af55aeed8f49681558544192e6.tar.gz
blackbird-op-linux-83401eb4990ff6af55aeed8f49681558544192e6.zip
bridge: fix race with topology change timer
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@samsung.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/bridge/br_stp_timer.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/bridge/br_stp_timer.c b/net/bridge/br_stp_timer.c
index c3530a81a33b..950663d4d330 100644
--- a/net/bridge/br_stp_timer.c
+++ b/net/bridge/br_stp_timer.c
@@ -107,7 +107,7 @@ static void br_tcn_timer_expired(unsigned long arg)
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);
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