netdev - [PATCH 2/3] [IPSEC]: Move x->outer_mode->output out of locked section

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Message-Id: <E1Ikhi5-0002mA-00@gondolin.me.apana.org.au>
Date:	Wed, 24 Oct 2007 22:59:53 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	"David S. Miller" <davem@...emloft.net>,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	Joakim Koskela <joakim.koskela@...t.fi>, netdev@...r.kernel.org
Subject: [PATCH 2/3] [IPSEC]: Move x->outer_mode->output out of locked section

[IPSEC]: Move x->outer_mode->output out of locked section

RO mode is the only one that requires a locked output function.  So it's
easier to move the lock into that function rather than requiring everyone
else to run under the lock.

In particular, this allows us to move the size check into the output
function without causing a potential dead-lock should the ICMP error
somehow hit the same SA on transmission.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
---

 net/ipv6/xfrm6_mode_ro.c |    3 +++
 net/xfrm/xfrm_output.c   |    8 ++++----
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/net/ipv6/xfrm6_mode_ro.c b/net/ipv6/xfrm6_mode_ro.c
index a7bc8c6..4a01cb3 100644
--- a/net/ipv6/xfrm6_mode_ro.c
+++ b/net/ipv6/xfrm6_mode_ro.c
@@ -28,6 +28,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/skbuff.h>
+#include <linux/spinlock.h>
 #include <linux/stringify.h>
 #include <linux/time.h>
 #include <net/ipv6.h>
@@ -53,7 +54,9 @@ static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
 	__skb_pull(skb, hdr_len);
 	memmove(ipv6_hdr(skb), iph, hdr_len);
 
+	spin_lock_bh(&x->lock);
 	x->lastused = get_seconds();
+	spin_unlock_bh(&x->lock);
 
 	return 0;
 }
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index 58d5a74..b1efdc8 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -53,6 +53,10 @@ int xfrm_output(struct sk_buff *skb)
 	}
 
 	do {
+		err = x->outer_mode->output(x, skb);
+		if (err)
+			goto error;
+
 		spin_lock_bh(&x->lock);
 		err = xfrm_state_check(x, skb);
 		if (err)
@@ -64,10 +68,6 @@ int xfrm_output(struct sk_buff *skb)
 				xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
 		}
 
-		err = x->outer_mode->output(x, skb);
-		if (err)
-			goto error;
-
 		x->curlft.bytes += skb->len;
 		x->curlft.packets++;
 
-
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