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| author |   Xin Long <lucien.xin@gmail.com> | 2019-07-02 00:54:55 +0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2019-07-07 13:18:53 -0700 |
| commit | 30a4616c1bfd121ecd7e4325aebd6621e0af719f (patch) | |
| tree | 26f15dadea9d99a92fd10312a6fea5d4c1cb90cd /net/tipc/udp_media.c | |
| parent | r8169: sync few chip names with vendor driver (diff) | |
| download | linux-dev-30a4616c1bfd121ecd7e4325aebd6621e0af719f.tar.xz linux-dev-30a4616c1bfd121ecd7e4325aebd6621e0af719f.zip | |
tipc: use rcu dereference functions properly
For these places are protected by rcu_read_lock, we change from
rcu_dereference_rtnl to rcu_dereference, as there is no need to
check if rtnl lock is held.
For these places are protected by rtnl_lock, we change from
rcu_dereference_rtnl to rtnl_dereference/rcu_dereference_protected,
as no extra memory barriers are needed under rtnl_lock() which also
protects tn->bearer_list[] and dev->tipc_ptr/b->media_ptr updating.
rcu_dereference_rtnl will be only used in the places where it could
be under rcu_read_lock or rtnl_lock.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc/udp_media.c')
| -rw-r--r-- | net/tipc/udp_media.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c index c0f694ae57ab..287df68721df 100644 --- a/net/tipc/udp_media.c +++ b/net/tipc/udp_media.c @@ -231,7 +231,7 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, } skb_set_inner_protocol(skb, htons(ETH_P_TIPC)); - ub = rcu_dereference_rtnl(b->media_ptr); + ub = rcu_dereference(b->media_ptr); if (!ub) { err = -ENODEV; goto out; @@ -490,7 +490,7 @@ int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb) } } - ub = rcu_dereference_rtnl(b->media_ptr); + ub = rtnl_dereference(b->media_ptr); if (!ub) { rtnl_unlock(); return -EINVAL; @@ -532,7 +532,7 @@ int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b) struct udp_bearer *ub; struct nlattr *nest; - ub = rcu_dereference_rtnl(b->media_ptr); + ub = rtnl_dereference(b->media_ptr); if (!ub) return -ENODEV; @@ -806,7 +806,7 @@ static void tipc_udp_disable(struct tipc_bearer *b) { struct udp_bearer *ub; - ub = rcu_dereference_rtnl(b->media_ptr); + ub = rtnl_dereference(b->media_ptr); if (!ub) { pr_err("UDP bearer instance not found\n"); return; |