1 files changed, 28 insertions, 14 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index f255579dc564..95a00eb57249 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1387,21 +1387,35 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
                 if (!prepres)
                         continue;
 
-                if (prev) {
-                        skb_new = skb_copy(skb, GFP_ATOMIC);
-                        if (!skb_new) {
-                                if (net_ratelimit())
-                                        printk(KERN_DEBUG "%s: failed to copy "
-                                               "multicast frame for %s",
-                                               local->mdev->name, prev->dev->name);
-                                continue;
-                        }
-                        rx.skb = skb_new;
-                        rx.dev = prev->dev;
-                        rx.sdata = prev;
-                        ieee80211_invoke_rx_handlers(local, local->rx_handlers,
-                                                     &rx, sta);
+                /*
+                 * frame is destined for this interface, but if it's not
+                 * also for the previous one we handle that after the
+                 * loop to avoid copying the SKB once too much
+                 */
+
+                if (!prev) {
+                        prev = sdata;
+                        continue;
                 }
+
+                /*
+                 * frame was destined for the previous interface
+                 * so invoke RX handlers for it
+                 */
+
+                skb_new = skb_copy(skb, GFP_ATOMIC);
+                if (!skb_new) {
+                        if (net_ratelimit())
+                                printk(KERN_DEBUG "%s: failed to copy "
+                                       "multicast frame for %s",
+                                       local->mdev->name, prev->dev->name);
+                        continue;
+                }
+                rx.skb = skb_new;
+                rx.dev = prev->dev;
+                rx.sdata = prev;
+                ieee80211_invoke_rx_handlers(local, local->rx_handlers,
+                                             &rx, sta);
                 prev = sdata;
         }
         if (prev) {