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Commit bc51dddf authored by WANG Cong's avatar WANG Cong Committed by David S. Miller
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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: default avatarCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 38f507f1

net/core/net_namespace.c

+15 −20
Original line number Diff line number Diff line
@@ -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;