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[NETFILTER]: nf_conntrack: simplify l4 protocol array allocation

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The retrying after an allocation failure is not necessary anymore
since we're holding the mutex the entire time, for the same
reason the double allocation race can't happen anymore.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-03-14 16:39:07 -07:00 committed by David S. Miller
parent 0661cca9c2
commit c6a1e615d1
1 changed files with 12 additions and 25 deletions
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37
net/netfilter/nf_conntrack_proto.c
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@ -281,47 +281,34 @@ int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto)
return -EBUSY;
mutex_lock(&nf_ct_proto_mutex);
retry:
if (nf_ct_protos[l4proto->l3proto]) {
if (nf_ct_protos[l4proto->l3proto][l4proto->l4proto]
!= &nf_conntrack_l4proto_generic) {
ret = -EBUSY;
goto out_unlock;
}
} else {
if (!nf_ct_protos[l4proto->l3proto]) {
/* l3proto may be loaded latter. */
struct nf_conntrack_l4proto **proto_array;
int i;
proto_array = (struct nf_conntrack_l4proto **)
kmalloc(MAX_NF_CT_PROTO *
sizeof(struct nf_conntrack_l4proto *),
GFP_KERNEL);
proto_array = kmalloc(MAX_NF_CT_PROTO *
sizeof(struct nf_conntrack_l4proto *),
GFP_KERNEL);
if (proto_array == NULL) {
ret = -ENOMEM;
goto out_unlock;
}
for (i = 0; i < MAX_NF_CT_PROTO; i++)
proto_array[i] = &nf_conntrack_l4proto_generic;
if (nf_ct_protos[l4proto->l3proto])
/* bad timing, but no problem */
kfree(proto_array);
else
nf_ct_protos[l4proto->l3proto] = proto_array;
/*
* Just once because array is never freed until unloading
* nf_conntrack.ko
*/
goto retry;
nf_ct_protos[l4proto->l3proto] = proto_array;
} else if (nf_ct_protos[l4proto->l3proto][l4proto->l4proto] !=
&nf_conntrack_l4proto_generic) {
ret = -EBUSY;
goto out_unlock;
}
ret = nf_ct_l4proto_register_sysctl(l4proto);
if (ret < 0)
goto out_unlock;
rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], l4proto);
rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
l4proto);
out_unlock:
mutex_unlock(&nf_ct_proto_mutex);