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tipc: remove implicit message delivery in node_unlock()

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After the most recent changes, all access calls to a link which
may entail addition of messages to the link's input queue are
postpended by an explicit call to tipc_sk_rcv(), using a reference
to the correct queue.

This means that the potentially hazardous implicit delivery, using
tipc_node_unlock() in combination with a binary flag and a cached
queue pointer, now has become redundant.

This commit removes this implicit delivery mechanism both for regular
data messages and for binding table update messages.

Tested-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>
This commit is contained in:
Jon Paul Maloy
2015-07-30 18:24:24 -04:00
committed by David S. Miller
parent 598411d70f
commit 23d8335d78
4 changed files with 10 additions and 63 deletions
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net/tipc/link.c
+3 -18
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@@ -559,8 +559,6 @@ void link_prepare_wakeup(struct tipc_link *l)
break;
skb_unlink(skb, &l->wakeupq);
skb_queue_tail(l->inputq, skb);
l->owner->inputq = l->inputq;
l->owner->action_flags |= TIPC_MSG_EVT;
}
}
@@ -598,8 +596,6 @@ void tipc_link_purge_queues(struct tipc_link *l_ptr)
void tipc_link_reset(struct tipc_link *l)
{
struct tipc_node *owner = l->owner;
tipc_link_fsm_evt(l, LINK_RESET_EVT);
/* Link is down, accept any session */
@@ -611,14 +607,10 @@ void tipc_link_reset(struct tipc_link *l)
/* Prepare for renewed mtu size negotiation */
l->mtu = l->advertised_mtu;
/* Clean up all queues, except inputq: */
/* Clean up all queues: */
__skb_queue_purge(&l->transmq);
__skb_queue_purge(&l->deferdq);
if (!owner->inputq)
owner->inputq = l->inputq;
skb_queue_splice_init(&l->wakeupq, owner->inputq);
if (!skb_queue_empty(owner->inputq))
owner->action_flags |= TIPC_MSG_EVT;
skb_queue_splice_init(&l->wakeupq, l->inputq);
tipc_link_purge_backlog(l);
kfree_skb(l->reasm_buf);
@@ -972,7 +964,6 @@ static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb)
{
struct tipc_node *node = link->owner;
struct tipc_msg *msg = buf_msg(skb);
u32 dport = msg_destport(msg);
switch (msg_user(msg)) {
case TIPC_LOW_IMPORTANCE:
@@ -980,17 +971,11 @@ static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb)
case TIPC_HIGH_IMPORTANCE:
case TIPC_CRITICAL_IMPORTANCE:
case CONN_MANAGER:
if (tipc_skb_queue_tail(link->inputq, skb, dport)) {
node->inputq = link->inputq;
node->action_flags |= TIPC_MSG_EVT;
}
skb_queue_tail(link->inputq, skb);
return true;
case NAME_DISTRIBUTOR:
node->bclink.recv_permitted = true;
node->namedq = link->namedq;
skb_queue_tail(link->namedq, skb);
if (skb_queue_len(link->namedq) == 1)
node->action_flags |= TIPC_NAMED_MSG_EVT;
return true;
case MSG_BUNDLER:
case TUNNEL_PROTOCOL: