bridge: eliminate call by reference

Change the bridging hook to be simple function with return value
rather than modifying the skb argument. This could generate better
code and is cleaner.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

2 files changed, 11 insertions, 12 deletions

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index a260679afad8..2f5c379d9ffa 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -121,13 +121,11 @@ static inline int is_link_local(const unsigned char *dest)
 
 /*
  * Called via br_handle_frame_hook.
- * Return 0 if *pskb should be processed furthur
- *        1 if *pskb is handled
+ * Return NULL if skb is handled
  * note: already called with rcu_read_lock (preempt_disabled)
  */
-int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb)
+struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
 {
-        struct sk_buff *skb = *pskb;
         const unsigned char *dest = eth_hdr(skb)->h_dest;
 
         if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
@@ -135,15 +133,15 @@ int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb)
 
         if (unlikely(is_link_local(dest))) {
                 skb->pkt_type = PACKET_HOST;
-                return NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
-                               NULL, br_handle_local_finish) != 0;
+
+                return (NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
+                                NULL, br_handle_local_finish) == 0) ? skb : NULL;
         }
 
         if (p->state == BR_STATE_FORWARDING || p->state == BR_STATE_LEARNING) {
                 if (br_should_route_hook) {
-                        if (br_should_route_hook(pskb))
-                                return 0;
-                        skb = *pskb;
+                        if (br_should_route_hook(&skb))
+                                return skb;
                         dest = eth_hdr(skb)->h_dest;
                 }
 
@@ -152,10 +150,10 @@ int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb)
 
                 NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
                         br_handle_frame_finish);
-                return 1;
+                return NULL;
         }
 
 err:
         kfree_skb(skb);
-        return 1;
+        return NULL;
 }
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 2b73de6c0b47..fab8ce0ce88d 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -182,7 +182,8 @@ extern void br_features_recompute(struct net_bridge *br);
 
 /* br_input.c */
 extern int br_handle_frame_finish(struct sk_buff *skb);
-extern int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb);
+extern struct sk_buff *br_handle_frame(struct net_bridge_port *p,
+                                       struct sk_buff *skb);
 
 /* br_ioctl.c */
 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);