netdev - [PATCH RFC 5/5] {pktgen, xfrm} Correct xfrm state lock usage when transforming

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Date:	Thu, 5 Dec 2013 15:57:19 +0800
From:	Fan Du <fan.du@...driver.com>
To:	<steffen.klassert@...unet.com>, <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>
Subject: [PATCH RFC 5/5] {pktgen, xfrm} Correct xfrm state lock usage when transforming

xfrm_state lock protects its state, i.e., VALID/DEAD and statistics,
not the transforming procedure, as both mode/type output functions
are reentrant.

Signed-off-by: Fan Du <fan.du@...driver.com>
---
 net/core/pktgen.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 6e30160..6fbce38 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -2499,8 +2499,6 @@ static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
 	if (x->props.mode == XFRM_MODE_TUNNEL)
 		__skb_dst_set_noref(skb, &pkt_dev->dst, true);
 
-	spin_lock(&x->lock);
-
 	err = x->outer_mode->output(x, skb);
 	if (err)
 		goto error;
@@ -2508,10 +2506,11 @@ static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
 	if (err)
 		goto error;
 
+	spin_lock(&x->lock);
 	x->curlft.bytes += skb->len;
 	x->curlft.packets++;
-error:
 	spin_unlock(&x->lock);
+error:
 	return err;
 }
 
-- 
1.7.9.5

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