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ipv4: make sure nh_pcpu_rth_output is always allocated

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Avoid checking nh_pcpu_rth_output in fast path,
abort fib_info creation on alloc_percpu failure.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Anastasov 2012-10-08 11:41:17 +00:00 committed by David S. Miller
parent e0adef0f74
commit f8a17175c6
2 changed files with 2 additions and 3 deletions
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2
net/ipv4/fib_semantics.c
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@ -840,6 +840,8 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
change_nexthops(fi) {
nexthop_nh->nh_parent = fi;
nexthop_nh->nh_pcpu_rth_output = alloc_percpu(struct rtable __rcu *);
if (!nexthop_nh->nh_pcpu_rth_output)
goto failure;
} endfor_nexthops(fi)
if (cfg->fc_mx) {

3
net/ipv4/route.c
View File

@ -1207,8 +1207,6 @@ static bool rt_cache_route(struct fib_nh *nh, struct rtable *rt)
if (rt_is_input_route(rt)) {
p = (struct rtable **)&nh->nh_rth_input;
} else {
if (!nh->nh_pcpu_rth_output)
goto nocache;
p = (struct rtable **)__this_cpu_ptr(nh->nh_pcpu_rth_output);
}
orig = *p;
@ -1223,7 +1221,6 @@ static bool rt_cache_route(struct fib_nh *nh, struct rtable *rt)
* unsuccessful at storing this route into the cache
* we really need to set it.
*/
nocache:
rt->dst.flags |= DST_NOCACHE;
ret = false;
}