bridge: Allow tail-call on br_pass_frame_up

This patch allows tail-call on the call to br_pass_frame_up
in br_handle_frame_finish.  This is now possible because of the
previous patch to call br_pass_frame_up last.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 13 insertions, 5 deletions

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 9589937e1c0a..be5ab8df6661 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -20,9 +20,9 @@
 /* Bridge group multicast address 802.1d (pg 51). */
 const u8 br_group_address[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
 
-static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb)
+static int br_pass_frame_up(struct sk_buff *skb)
 {
-        struct net_device *indev, *brdev = br->dev;
+        struct net_device *indev, *brdev = BR_INPUT_SKB_CB(skb)->brdev;
 
         brdev->stats.rx_packets++;
         brdev->stats.rx_bytes += skb->len;
@@ -30,8 +30,8 @@ static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb)
         indev = skb->dev;
         skb->dev = brdev;
 
-        NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
-                netif_receive_skb);
+        return NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
+                       netif_receive_skb);
 }
 
 /* note: already called with rcu_read_lock (preempt_disabled) */
@@ -53,6 +53,8 @@ int br_handle_frame_finish(struct sk_buff *skb)
         if (p->state == BR_STATE_LEARNING)
                 goto drop;
 
+        BR_INPUT_SKB_CB(skb)->brdev = br->dev;
+
         /* The packet skb2 goes to the local host (NULL to skip). */
         skb2 = NULL;
 
@@ -81,7 +83,7 @@ int br_handle_frame_finish(struct sk_buff *skb)
         }
 
         if (skb2)
-                br_pass_frame_up(br, skb2);
+                return br_pass_frame_up(skb2);
 
 out:
         return 0;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 1f0c4f44b765..16513793156e 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -131,6 +131,12 @@ struct net_bridge
         struct kobject                  *ifobj;
 };
 
+struct br_input_skb_cb {
+        struct net_device *brdev;
+};
+
+#define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
+
 extern struct notifier_block br_device_notifier;
 extern const u8 br_group_address[ETH_ALEN];