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/p54/p54common.c b/drivers/net/wireless/p54/p54common.c
index 22ca122bd798..1b15f9e0b861 100644
--- a/drivers/net/wireless/p54/p54common.c
+++ b/drivers/net/wireless/p54/p54common.c
@@ -794,7 +794,8 @@ static int p54_rx_data(struct ieee80211_hw *dev, struct sk_buff *skb)
         skb_pull(skb, header_len);
         skb_trim(skb, le16_to_cpu(hdr->len));
 
-        ieee80211_rx_irqsafe(dev, skb, &rx_status);
+        memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
+        ieee80211_rx_irqsafe(dev, skb);
 
         queue_delayed_work(dev->workqueue, &priv->work,
                            msecs_to_jiffies(P54_STATISTICS_UPDATE));