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tipc: make function tipc_net_finalize() thread safe 

The setting of the node address is not thread safe, meaning that
two discoverers may decide to set it simultanously, with a duplicate
entry in the name table as result. We fix that with this commit.

Fixes: 25b0b9c4e8 ("tipc: handle collisions of 32-bit node address hash values")
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Maloy 2018-07-06 20:10:06 +02:00 committed by David S. Miller
parent 92018c7ca9
commit 9faa89d4ed
1 changed files with 11 additions and 6 deletions
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7
net/tipc/net.c
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@ -121,13 +121,18 @@ int tipc_net_init(struct net *net, u8 *node_id, u32 addr)
void tipc_net_finalize(struct net *net, u32 addr)
{
struct tipc_net *tn = tipc_net(net);
spin_lock_bh(&tn->node_list_lock);
if (!tipc_own_addr(net)) {
tipc_set_node_addr(net, addr);
smp_mb();
tipc_named_reinit(net);
tipc_sk_reinit(net);
tipc_nametbl_publish(net, TIPC_CFG_SRV, addr, addr,
TIPC_CLUSTER_SCOPE, 0, addr);
}
spin_unlock_bh(&tn->node_list_lock);
}
void tipc_net_stop(struct net *net)
{