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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: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2018-08-10 20:51:46 +03:00 committed by David S. Miller
parent ff25276de9
commit 67b0c1a3c9
1 changed files with 20 additions and 20 deletions
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40
net/sched/act_pedit.c
View File

@ -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;