3.6.11.5 stable review patch. If anyone has any objections, please let me know. ------------------ From: stephen hemminger [ 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 Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller Signed-off-by: Steven Rostedt --- net/bridge/br_stp_timer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/bridge/br_stp_timer.c b/net/bridge/br_stp_timer.c index a6747e6..acc63a4 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); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/