netdev - [PATCH net-2.6] net_sched: always clone skbs

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Message-Id: <1292855730-19265-1-git-send-email-xiaosuo@gmail.com>
Date:	Mon, 20 Dec 2010 22:35:30 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Jarek Poplawski <jarkao2@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	Jamal Hadi Salim <hadi@...erus.ca>,
	Pawel Staszewski <pstaszewski@...are.pl>,
	Changli Gao <xiaosuo@...il.com>
Subject: [PATCH net-2.6] net_sched: always clone skbs

Pawel reported a panic related to handling shared skbs in ixgbe
incorrectly. So we need to revert my previous patch to work around
this bug. Instead of reverting the patch completely, I just revert
the essential lines, so we can add the previous optimization
back more easily in future.

    commit 3511c9132f8b1e1b5634e41a3331c44b0c13be70
    Author: Changli Gao <xiaosuo@...il.com>
    Date:   Sat Oct 16 13:04:08 2010 +0000
    
        net_sched: remove the unused parameter of qdisc_create_dflt()

Reported-by: Pawel Staszewski <pstaszewski@...are.pl>
Signed-off-by: Changli Gao <xiaosuo@...il.com>
---
 include/net/sch_generic.h |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 786cc39..0af57eb 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -611,11 +611,7 @@ static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
 {
 	struct sk_buff *n;
 
-	if ((action == TC_ACT_STOLEN || action == TC_ACT_QUEUED) &&
-	    !skb_shared(skb))
-		n = skb_get(skb);
-	else
-		n = skb_clone(skb, gfp_mask);
+	n = skb_clone(skb, gfp_mask);
 
 	if (n) {
 		n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
--
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