netns: avoid disabling irq for netns id

We never read or change netns id in hardirq context,
the only place we read netns id in softirq context
is in vxlan_xmit(). So, it should be enough to just
disable BH.

Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index f3fa435..42bdda0 100644 (file)
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -215,14 +215,13 @@ static void rtnl_net_notifyid(struct net *net, int cmd, int id);
  */
 int peernet2id_alloc(struct net *net, struct net *peer)
 {
-       unsigned long flags;
        bool alloc;
        int id;
 
-       spin_lock_irqsave(&net->nsid_lock, flags);
+       spin_lock_bh(&net->nsid_lock);
        alloc = atomic_read(&peer->count) == 0 ? false : true;
        id = __peernet2id_alloc(net, peer, &alloc);
-       spin_unlock_irqrestore(&net->nsid_lock, flags);
+       spin_unlock_bh(&net->nsid_lock);
        if (alloc && id >= 0)
                rtnl_net_notifyid(net, RTM_NEWNSID, id);
        return id;
@@ -231,12 +230,11 @@ int peernet2id_alloc(struct net *net, struct net *peer)
 /* This function returns, if assigned, the id of a peer netns. */
 int peernet2id(struct net *net, struct net *peer)
 {
-       unsigned long flags;
        int id;
 
-       spin_lock_irqsave(&net->nsid_lock, flags);
+       spin_lock_bh(&net->nsid_lock);
        id = __peernet2id(net, peer);
-       spin_unlock_irqrestore(&net->nsid_lock, flags);
+       spin_unlock_bh(&net->nsid_lock);
        return id;
 }
 EXPORT_SYMBOL(peernet2id);
@@ -251,18 +249,17 @@ bool peernet_has_id(struct net *net, struct net *peer)
 
 struct net *get_net_ns_by_id(struct net *net, int id)
 {
-       unsigned long flags;
        struct net *peer;
 
        if (id < 0)
                return NULL;
 
        rcu_read_lock();
-       spin_lock_irqsave(&net->nsid_lock, flags);
+       spin_lock_bh(&net->nsid_lock);
        peer = idr_find(&net->netns_ids, id);
        if (peer)
                get_net(peer);
-       spin_unlock_irqrestore(&net->nsid_lock, flags);
+       spin_unlock_bh(&net->nsid_lock);
        rcu_read_unlock();
 
        return peer;
@@ -406,17 +403,17 @@ static void cleanup_net(struct work_struct *work)
                for_each_net(tmp) {
                        int id;
 
-                       spin_lock_irq(&tmp->nsid_lock);
+                       spin_lock_bh(&tmp->nsid_lock);
                        id = __peernet2id(tmp, net);
                        if (id >= 0)
                                idr_remove(&tmp->netns_ids, id);
-                       spin_unlock_irq(&tmp->nsid_lock);
+                       spin_unlock_bh(&tmp->nsid_lock);
                        if (id >= 0)
                                rtnl_net_notifyid(tmp, RTM_DELNSID, id);
                }
-               spin_lock_irq(&net->nsid_lock);
+               spin_lock_bh(&net->nsid_lock);
                idr_destroy(&net->netns_ids);
-               spin_unlock_irq(&net->nsid_lock);
+               spin_unlock_bh(&net->nsid_lock);
 
        }
        rtnl_unlock();
@@ -544,7 +541,6 @@ static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh)
 {
        struct net *net = sock_net(skb->sk);
        struct nlattr *tb[NETNSA_MAX + 1];
-       unsigned long flags;
        struct net *peer;
        int nsid, err;
 
@@ -565,15 +561,15 @@ static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh)
        if (IS_ERR(peer))
                return PTR_ERR(peer);
 
-       spin_lock_irqsave(&net->nsid_lock, flags);
+       spin_lock_bh(&net->nsid_lock);
        if (__peernet2id(net, peer) >= 0) {
-               spin_unlock_irqrestore(&net->nsid_lock, flags);
+               spin_unlock_bh(&net->nsid_lock);
                err = -EEXIST;
                goto out;
        }
 
        err = alloc_netid(net, peer, nsid);
-       spin_unlock_irqrestore(&net->nsid_lock, flags);
+       spin_unlock_bh(&net->nsid_lock);
        if (err >= 0) {
                rtnl_net_notifyid(net, RTM_NEWNSID, err);
                err = 0;
@@ -695,11 +691,10 @@ static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb)
                .idx = 0,
                .s_idx = cb->args[0],
        };
-       unsigned long flags;
 
-       spin_lock_irqsave(&net->nsid_lock, flags);
+       spin_lock_bh(&net->nsid_lock);
        idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb);
-       spin_unlock_irqrestore(&net->nsid_lock, flags);
+       spin_unlock_bh(&net->nsid_lock);
 
        cb->args[0] = net_cb.idx;
        return skb->len;