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authorErik Hugne <erik.hugne@ericsson.com>2014-03-06 14:40:19 +0100
committerDavid S. Miller <davem@davemloft.net>2014-03-06 20:46:23 +0100
commitedcc0511b5ee7235282a688cd604e3ae7f9e1fc9 (patch)
tree08ca164fb87ec0848efef992466a08d6469bbb8b
parenttipc: avoid to unnecessary process switch under non-block mode (diff)
downloadlinux-edcc0511b5ee7235282a688cd604e3ae7f9e1fc9.tar.xz
linux-edcc0511b5ee7235282a688cd604e3ae7f9e1fc9.zip
tipc: drop subscriber connection id invalidation
When a topology server subscriber is disconnected, the associated connection id is set to zero. A check vs zero is then done in the subscription timeout function to see if the subscriber have been shut down. This is unnecessary, because all subscription timers will be cancelled when a subscriber terminates. Setting the connection id to zero is actually harmful because id zero is the identity of the topology server listening socket, and can cause a race that leads to this socket being closed instead. Signed-off-by: Erik Hugne <erik.hugne@ericsson.com> Acked-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/tipc/subscr.c11
1 files changed, 0 insertions, 11 deletions
diff --git a/net/tipc/subscr.c b/net/tipc/subscr.c
index a6ce3bbf3eaf..11c9ae00837d 100644
--- a/net/tipc/subscr.c
+++ b/net/tipc/subscr.c
@@ -149,14 +149,6 @@ static void subscr_timeout(struct tipc_subscription *sub)
/* The spin lock per subscriber is used to protect its members */
spin_lock_bh(&subscriber->lock);
- /* Validate if the connection related to the subscriber is
- * closed (in case subscriber is terminating)
- */
- if (subscriber->conid == 0) {
- spin_unlock_bh(&subscriber->lock);
- return;
- }
-
/* Validate timeout (in case subscription is being cancelled) */
if (sub->timeout == TIPC_WAIT_FOREVER) {
spin_unlock_bh(&subscriber->lock);
@@ -211,9 +203,6 @@ static void subscr_release(struct tipc_subscriber *subscriber)
spin_lock_bh(&subscriber->lock);
- /* Invalidate subscriber reference */
- subscriber->conid = 0;
-
/* Destroy any existing subscriptions for subscriber */
list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
subscription_list) {