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Commit 67b0c1a3 authored by Vlad Buslov's avatar Vlad Buslov Committed by David S. Miller
Browse files

net: sched: act_pedit: remove dependency on rtnl lock 



Rearrange pedit init code to only access pedit action data while holding
tcf spinlock. Change keys allocation type to atomic to allow it to execute
while holding tcf spinlock. Take tcf spinlock in dump function when
accessing pedit action data.

Signed-off-by: default avatarVlad Buslov <vladbu@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ff25276d

net/sched/act_pedit.c

+20 −20
Original line number Diff line number Diff line
@@ -187,44 +187,38 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla, 
			tcf_idr_cleanup(tn, parm->index);

			goto out_free;

		}

		p = to_pedit(*a);

		keys = kmalloc(ksize, GFP_KERNEL);

		if (!keys) {

			tcf_idr_release(*a, bind);

			ret = -ENOMEM;

			goto out_free;

		}

		ret = ACT_P_CREATED;

	} else if (err > 0) {

		if (bind)

			goto out_free;

		if (!ovr) {

			tcf_idr_release(*a, bind);

			ret = -EEXIST;

			goto out_free;

		}

		p = to_pedit(*a);

		if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {

			keys = kmalloc(ksize, GFP_KERNEL);

			if (!keys) {

				ret = -ENOMEM;

				goto out_free;

			}

			goto out_release;

		}

	} else {

		return err;

	}



	p = to_pedit(*a);

	spin_lock_bh(&p->tcf_lock);

	p->tcfp_flags = parm->flags;

	p->tcf_action = parm->action;

	if (keys) {



	if (ret == ACT_P_CREATED ||

	    (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys)) {

		keys = kmalloc(ksize, GFP_ATOMIC);

		if (!keys) {

			spin_unlock_bh(&p->tcf_lock);

			ret = -ENOMEM;

			goto out_release;

		}

		kfree(p->tcfp_keys);

		p->tcfp_keys = keys;

		p->tcfp_nkeys = parm->nkeys;

	}

	memcpy(p->tcfp_keys, parm->keys, ksize);



	p->tcfp_flags = parm->flags;

	p->tcf_action = parm->action;



	kfree(p->tcfp_keys_ex);

	p->tcfp_keys_ex = keys_ex;
@@ -232,6 +226,9 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla, 
	if (ret == ACT_P_CREATED)

		tcf_idr_insert(tn, *a);

	return ret;



out_release:

	tcf_idr_release(*a, bind);

out_free:

	kfree(keys_ex);

	return ret;
@@ -410,6 +407,7 @@ static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a, 
	if (unlikely(!opt))

		return -ENOBUFS;



	spin_lock_bh(&p->tcf_lock);

	memcpy(opt->keys, p->tcfp_keys,

	       p->tcfp_nkeys * sizeof(struct tc_pedit_key));

	opt->index = p->tcf_index;
@@ -432,11 +430,13 @@ static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a, 
	tcf_tm_dump(&t, &p->tcf_tm);

	if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))

		goto nla_put_failure;

	spin_unlock_bh(&p->tcf_lock);



	kfree(opt);

	return skb->len;



nla_put_failure:

	spin_unlock_bh(&p->tcf_lock);

	nlmsg_trim(skb, b);

	kfree(opt);

	return -1;