RDS: Do not send congestion updates to loopback connections
Andy Grover [Fri, 30 Oct 2009 08:51:56 +0000 (08:51 +0000)]
This issue was discovered by HP's Pradeep and fixed in OFED
1.3, but not fixed in later versions, since the fix's implementation
was not immediately applyable to the later code. This patch should
do the trick for 1.4+ codebases.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/rds/cong.c

index dd2711d..6d06cac 100644 (file)
@@ -218,6 +218,8 @@ void rds_cong_queue_updates(struct rds_cong_map *map)
        spin_lock_irqsave(&rds_cong_lock, flags);
 
        list_for_each_entry(conn, &map->m_conn_list, c_map_item) {
+               if (conn->c_loopback)
+                       continue;
                if (!test_and_set_bit(0, &conn->c_map_queued)) {
                        rds_stats_inc(s_cong_update_queued);
                        queue_delayed_work(rds_wq, &conn->c_send_w, 0);