From b0558ef24a792906914fcad277f3befe2420e618 Mon Sep 17 00:00:00 2001
From: stephen hemminger <shemminger@vyatta.com>
Date: Mon, 24 Sep 2012 18:12:25 +0000
Subject: [PATCH] xfrm: remove extranous rcu_read_lock
The handlers for xfrm_tunnel are always invoked with rcu read lock
already.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv4/ip_vti.c | 5 -----
net/ipv4/ipip.c | 9 +--------
net/ipv6/sit.c | 6 ------
3 files changed, 1 insertion(+), 19 deletions(-)
diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
index 3511ffba7bd4..978bca4818ae 100644
--- a/net/ipv4/ip_vti.c
+++ b/net/ipv4/ip_vti.c
@@ -304,7 +304,6 @@ static int vti_err(struct sk_buff *skb, u32 info)
err = -ENOENT;
- rcu_read_lock();
t = vti_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr);
if (t == NULL)
goto out;
@@ -326,7 +325,6 @@ static int vti_err(struct sk_buff *skb, u32 info)
t->err_count = 1;
t->err_time = jiffies;
out:
- rcu_read_unlock();
return err;
}
@@ -336,7 +334,6 @@ static int vti_rcv(struct sk_buff *skb)
struct ip_tunnel *tunnel;
const struct iphdr *iph = ip_hdr(skb);
- rcu_read_lock();
tunnel = vti_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr);
if (tunnel != NULL) {
struct pcpu_tstats *tstats;
@@ -348,10 +345,8 @@ static int vti_rcv(struct sk_buff *skb)
u64_stats_update_end(&tstats->syncp);
skb->dev = tunnel->dev;
- rcu_read_unlock();
return 1;
}
- rcu_read_unlock();
return -1;
}
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 99af1f0cc658..618bde867ac1 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -365,8 +365,6 @@ static int ipip_err(struct sk_buff *skb, u32 info)
}
err = -ENOENT;
-
- rcu_read_lock();
t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr);
if (t == NULL)
goto out;
@@ -398,7 +396,7 @@ static int ipip_err(struct sk_buff *skb, u32 info)
t->err_count = 1;
t->err_time = jiffies;
out:
- rcu_read_unlock();
+
return err;
}
@@ -416,13 +414,11 @@ static int ipip_rcv(struct sk_buff *skb)
struct ip_tunnel *tunnel;
const struct iphdr *iph = ip_hdr(skb);
- rcu_read_lock();
tunnel = ipip_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr);
if (tunnel != NULL) {
struct pcpu_tstats *tstats;
if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
- rcu_read_unlock();
kfree_skb(skb);
return 0;
}
@@ -445,11 +441,8 @@ static int ipip_rcv(struct sk_buff *skb)
ipip_ecn_decapsulate(iph, skb);
netif_rx(skb);
-
- rcu_read_unlock();
return 0;
}
- rcu_read_unlock();
return -1;
}
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 3bd1bfc01f85..3ed54ffd8d50 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -545,7 +545,6 @@ static int ipip6_err(struct sk_buff *skb, u32 info)
err = -ENOENT;
- rcu_read_lock();
t = ipip6_tunnel_lookup(dev_net(skb->dev),
skb->dev,
iph->daddr,
@@ -579,7 +578,6 @@ static int ipip6_err(struct sk_buff *skb, u32 info)
t->err_count = 1;
t->err_time = jiffies;
out:
- rcu_read_unlock();
return err;
}
@@ -599,7 +597,6 @@ static int ipip6_rcv(struct sk_buff *skb)
iph = ip_hdr(skb);
- rcu_read_lock();
tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
iph->saddr, iph->daddr);
if (tunnel != NULL) {
@@ -615,7 +612,6 @@ static int ipip6_rcv(struct sk_buff *skb)
if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
!isatap_chksrc(skb, iph, tunnel)) {
tunnel->dev->stats.rx_errors++;
- rcu_read_unlock();
kfree_skb(skb);
return 0;
}
@@ -630,12 +626,10 @@ static int ipip6_rcv(struct sk_buff *skb)
netif_rx(skb);
- rcu_read_unlock();
return 0;
}
/* no tunnel matched, let upstream know, ipsec may handle it */
- rcu_read_unlock();
return 1;
out:
kfree_skb(skb);