netdev - [PATCH net-next 2/4] tipc: avoid stale link after aborted failover

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Date:	Tue,  3 Feb 2015 08:59:18 -0500
From:	Jon Maloy <jon.maloy@...csson.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	erik.hugne@...csson.com, ying.xue@...driver.com, maloy@...jonn.com,
	tipc-discussion@...ts.sourceforge.net,
	Jon Maloy <jon.maloy@...csson.com>
Subject: [PATCH net-next 2/4] 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@...csson.com>
Reviewed-by: Ying Xue <ying.xue@...driver.com>
Signed-off-by: Jon Maloy <jon.maloy@...csson.com>
---
 net/tipc/link.h | 1 +
 net/tipc/node.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/net/tipc/link.h b/net/tipc/link.h
index f06b779..3e3432b 100644
--- a/net/tipc/link.h
+++ b/net/tipc/link.h
@@ -202,6 +202,7 @@ struct tipc_port;
 struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
 			      struct tipc_bearer *b_ptr,
 			      const struct tipc_media_addr *media_addr);
+void tipc_link_delete(struct tipc_link *link);
 void tipc_link_delete_list(struct net *net, unsigned int bearer_id,
 			   bool shutting_down);
 void tipc_link_failover_send_queue(struct tipc_link *l_ptr);
diff --git a/net/tipc/node.c b/net/tipc/node.c
index ee5d33c..d4cb8c1 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;
-- 
1.9.1

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