mac80211: push rx status into skb->cb

Within mac80211, we often need to copy the rx status into
skb->cb. This is wasteful, as drivers could be building it
in there to start with. This patch changes the API so that
drivers are expected to pass the RX status in skb->cb, now
accessible as IEEE80211_SKB_RXCB(skb). It also updates all
drivers to pass the rx status in there, but only by making
them memcpy() it into place before the call to the receive
function (ieee80211_rx(_irqsafe)). Each driver can now be
optimised on its own schedule.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 57813e72c808..41e33798adb5 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -449,7 +449,8 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
          * mac80211 will clean up the skb structure.
          */
         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
-        ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
+        memcpy(IEEE80211_SKB_RXCB(entry->skb), rx_status, sizeof(*rx_status));
+        ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb);
 
         /*
          * Replace the skb with the freshly allocated one.