tipc: Flush unsent broadcast messages when contact with last node is lost

Adds code to release any unsent broadcast messages in the broadcast link
transmit queue if TIPC loses contact with its only neighboring node.
Previously, a broadcast link that was in the congested state would hold
on to the unsent messages, even though the messages were now undeliverable.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index dd990b081435158bc387b3522d87a7e9a7aeee32..4609819ea807c2e61c5a06b1bfc8cfbb81da3679 100644 (file)
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -252,7 +252,17 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
 
        while (crs && less_eq(buf_seqno(crs), acked)) {
                next = crs->next;
-               bcbuf_decr_acks(crs);
+
+               if (crs != bcl->next_out)
+                       bcbuf_decr_acks(crs);
+               else if (bclink->bcast_nodes.count)
+                       break;
+               else {
+                       bcbuf_set_acks(crs, 0);
+                       bcl->next_out = next;
+                       bclink_set_last_sent();
+               }
+
                if (bcbuf_acks(crs) == 0) {
                        bcl->first_out = next;
                        bcl->out_queue_size--;