tipc: introduce per-link spinlock
As a preparation to allow parallel links to work more independently
from each other we introduce a per-link spinlock, to be stored in the
struct nodes's link entry area. Since the node lock still is a regular
spinlock there is no increase in parallellism at this stage.
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>
diff --git a/net/tipc/link.c b/net/tipc/link.c
index fa452fb..b5e895c 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1995,6 +1995,7 @@
struct tipc_node *node;
struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
struct net *net = sock_net(skb->sk);
+ struct tipc_link_entry *le;
if (!info->attrs[TIPC_NLA_LINK])
return -EINVAL;
@@ -2020,17 +2021,17 @@
node = tipc_link_find_owner(net, link_name, &bearer_id);
if (!node)
return -EINVAL;
-
+ le = &node->links[bearer_id];
tipc_node_lock(node);
-
- link = node->links[bearer_id].link;
+ spin_lock_bh(&le->lock);
+ link = le->link;
if (!link) {
tipc_node_unlock(node);
return -EINVAL;
}
link_reset_statistics(link);
-
+ spin_unlock_bh(&le->lock);
tipc_node_unlock(node);
return 0;