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| author | Allan Stephens <allan.stephens@windriver.com> | 2011-10-25 15:14:46 -0400 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2012-02-06 16:59:16 -0500 |
| commit | 934993137199ffb56fef50664f87e71cdb3471b0 (patch) | |
| tree | eda9ba8ab9f8bed085ff108b38765b72aa8e4e50 /net/tipc/link.c | |
| parent | 4d75313ce9b832efc4efb487f080b5ed72beae2c (diff) | |
| download | linux-3.10-934993137199ffb56fef50664f87e71cdb3471b0.tar.gz linux-3.10-934993137199ffb56fef50664f87e71cdb3471b0.tar.bz2 linux-3.10-934993137199ffb56fef50664f87e71cdb3471b0.zip | |
tipc: Ensure broadcast link re-acquires node after link failure
Fix a bug that can prevent TIPC from sending broadcast messages to a node
if contact with the node is lost and then regained. The problem occurs if
the broadcast link first clears the flag indicating the node is part of the
link's distribution set (when it loses contact with the node), and later
fails to restore the flag (when contact is regained); restoration fails
if contact with the node is regained by implicit unicast link activation
triggered by the arrival of a data message, rather than explicitly by the
arrival of a link activation message.
The broadcast link now uses separate fields to track whether a node is
theoretically capable of receiving broadcast messages versus whether it is
actually part of the link's distribution set. The former member is updated
by the receipt of link protocol messages, which can occur at any time; the
latter member is updated only when contact with the node is gained or lost.
This change also permits the simplification of several conditional
expressions since the broadcast link's "supported" field can now only be
set if there are working links to the associated node.
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'net/tipc/link.c')
| -rw-r--r-- | net/tipc/link.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c index 4ea6cad1174..3405f560a84 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -1502,6 +1502,7 @@ static void link_retransmit_failure(struct tipc_link *l_ptr, tipc_addr_string_fill(addr_string, n_ptr->addr); info("Multicast link info for %s\n", addr_string); + info("Supportable: %d, ", n_ptr->bclink.supportable); info("Supported: %d, ", n_ptr->bclink.supported); info("Acked: %u\n", n_ptr->bclink.acked); info("Last in: %u, ", n_ptr->bclink.last_in); @@ -1736,7 +1737,7 @@ void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *b_ptr) /* Release acked messages */ - if (tipc_node_is_up(n_ptr) && n_ptr->bclink.supported) + if (n_ptr->bclink.supported) tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg)); crs = l_ptr->first_out; @@ -2126,7 +2127,7 @@ static void link_recv_proto_msg(struct tipc_link *l_ptr, struct sk_buff *buf) } else { l_ptr->max_pkt = l_ptr->max_pkt_target; } - l_ptr->owner->bclink.supported = (max_pkt_info != 0); + l_ptr->owner->bclink.supportable = (max_pkt_info != 0); /* Synchronize broadcast link info, if not done previously */ |