netdev - [PATCH net v2 3/6] ipv4: make sure nh_pcpu_rth

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Date:	Tue,  9 Oct 2012 00:41:17 +0300
From:	Julian Anastasov <ja@....bg>
To:	netdev@...r.kernel.org
Subject: [PATCH net v2 3/6] ipv4: make sure nh_pcpu_rth_output is always allocated

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

Signed-off-by: Julian Anastasov <ja@....bg>
---
 net/ipv4/fib_semantics.c |    2 ++
 net/ipv4/route.c         |    3 ---
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 2677530..71b125c 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -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) {
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index b90da1b..5b0180f 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -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;
 	}
-- 
1.7.3.4

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