tipc: avoid stale link after aborted failover

During link failover it may happen that the remaining link goes
down while it is still in the process of taking over traffic
from a previously failed link. When this happens, we currently
abort the failover procedure and reset the first failed link to
non-failover mode, so that it will be ready to re-establish
contact with its peer when it comes available.

However, if the first link goes down because its bearer was manually
disabled, it is not enough to reset it; it must also be deleted;
which is supposed to happen when the failover procedure is finished.
Otherwise it will remain a zombie link: attached to the owner node
structure, in mode LINK_STOPPED, and permanently blocking any re-
establishing of the link to the peer via the interface in question.

We fix this by amending the failover abort procedure. Apart from
resetting the link to non-failover state, we test if the link is
also in LINK_STOPPED mode. If so, we delete it, using the conditional
tipc_link_delete() function introduced in the previous commit.

Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/tipc/node.c b/net/tipc/node.c
index ee5d33cfcf80..d4cb8c127063 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -406,6 +406,10 @@ static void node_lost_contact(struct tipc_node *n_ptr)
                 l_ptr->reset_checkpoint = l_ptr->next_in_no;
                 l_ptr->exp_msg_count = 0;
                 tipc_link_reset_fragments(l_ptr);
+
+                /* Link marked for deletion after failover? => do it now */
+                if (l_ptr->flags & LINK_STOPPED)
+                        tipc_link_delete(l_ptr);
         }
 
         n_ptr->action_flags &= ~TIPC_WAIT_OWN_LINKS_DOWN;