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netfilter: nfnetlink: remove redundant variable nskb

PATCH Applied Duan Jiong 2 participants 2 messages Dec 10, 2014 – Jan 5, 2015

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Networking netfilter
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Duan Jiong

author
#0 lore raw

PATCH 1/1 netfilter: nfnetlink: remove redundant variable nskb

Actually after netlink_skb_clone() is called, the nskb and skb will point to the same thing, but they are used just like they are different, sometimes this is confusing, so i think there is no necessary to keep nskb anymore.

Signed-off-by Duan Jiong <[email protected]>
---
 net/netfilter/nfnetlink.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)
net/netfilter/nfnetlink.c +7 -8
index 13c2e17..a7a7e82 100644
@@ -272,7 +272,7 @@ static void nfnl_err_deliver(struct list_head *err_list, struct sk_buff *skb)
 static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
 				u_int16_t subsys_id)
 {
-	struct sk_buff *nskb, *oskb = skb;
+	struct sk_buff *oskb = skb;
 	struct net *net = sock_net(skb->sk);
 	const struct nfnetlink_subsystem *ss;
 	const struct nfnl_callback *nc;

@@ -283,12 +283,11 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (subsys_id >= NFNL_SUBSYS_COUNT)
 		return netlink_ack(skb, nlh, -EINVAL);
 replay:
-	nskb = netlink_skb_clone(oskb, GFP_KERNEL);
-	if (!nskb)
+	skb = netlink_skb_clone(oskb, GFP_KERNEL);
+	if (!skb)
 		return netlink_ack(oskb, nlh, -ENOMEM);
 
-	nskb->sk = oskb->sk;
-	skb = nskb;
+	skb->sk = oskb->sk;
 
 	nfnl_lock(subsys_id);
 	ss = rcu_dereference_protected(table[subsys_id].subsys,

@@ -305,7 +304,7 @@ replay:
 		{
 			nfnl_unlock(subsys_id);
 			netlink_ack(skb, nlh, -EOPNOTSUPP);
-			return kfree_skb(nskb);
+			return kfree_skb(skb);
 		}
 	}
 

@@ -385,7 +384,7 @@ replay:
 				nfnl_err_reset(&err_list);
 				ss->abort(oskb);
 				nfnl_unlock(subsys_id);
-				kfree_skb(nskb);
+				kfree_skb(skb);
 				goto replay;
 			}
 		}

@@ -426,7 +425,7 @@ done:
 
 	nfnl_err_deliver(&err_list, oskb);
 	nfnl_unlock(subsys_id);
-	kfree_skb(nskb);
+	kfree_skb(skb);
 }
 
 static void nfnetlink_rcv(struct sk_buff *skb)
Signature · 1 line
1.8.3.1
maintainer Applied
#1 lore raw
Quoted 5 lines · Duan Jiong

Actually after netlink_skb_clone() is called, the nskb and skb will point to the same thing, but they are used just like they are different, sometimes this is confusing, so i think there is no necessary to keep nskb anymore.

Applied, thanks.