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net/ipv6: Move rcu_read_lock to callers of ip6_rt_cache_alloc

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A later patch protects 'from' in rt6_info and this simplifies the
locking needed by it.

With the move, the fib6_info_hold for the uncached_rt is no longer
needed since the rcu_lock is still held.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-04-20 15:37:59 -07:00 committed by David S. Miller
parent a269f1a764
commit 4d85cd0c2a
1 changed files with 6 additions and 7 deletions
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13
net/ipv6/route.c
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@ -1164,10 +1164,8 @@ static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort,
* Clone the route.
*/
rcu_read_lock();
dev = ip6_rt_get_dev_rcu(ort);
rt = ip6_dst_alloc(dev_net(dev), dev, 0);
rcu_read_unlock();
if (!rt)
return NULL;
@ -1855,14 +1853,11 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
* the daddr in the skb during the neighbor look-up is different
* from the fl6->daddr used to look-up route here.
*/
struct rt6_info *uncached_rt;
fib6_info_hold(f6i);
rcu_read_unlock();
uncached_rt = ip6_rt_cache_alloc(f6i, &fl6->daddr, NULL);
fib6_info_release(f6i);
rcu_read_unlock();
if (uncached_rt) {
/* Uncached_rt's refcnt is taken during ip6_rt_cache_alloc()
@ -2280,7 +2275,9 @@ static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
} else if (daddr) {
struct rt6_info *nrt6;
rcu_read_lock();
nrt6 = ip6_rt_cache_alloc(rt6->from, daddr, saddr);
rcu_read_unlock();
if (nrt6) {
rt6_do_update_pmtu(nrt6, mtu);
if (rt6_insert_exception(nrt6, rt6->from))
@ -3299,7 +3296,9 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
NEIGH_UPDATE_F_ISROUTER)),
NDISC_REDIRECT, &ndopts);
rcu_read_lock();
nrt = ip6_rt_cache_alloc(rt->from, &msg->dest, NULL);
rcu_read_unlock();
if (!nrt)
goto out;