mac80211: Remove superfluous ieee80211_rx_h_remove_qos_control

This seems to not serve any purpose anymore, at least all frame
processing afterwards seems to be able to deal with QoS frames. So,
let's save the expensive memmove and just leave the QoS header in the
802.11 frame for further processing.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/rx.c

@@ -1576,25 +1576,6 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
 	return RX_CONTINUE;
 }
 
-static ieee80211_rx_result debug_noinline
-ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
-{
-	u8 *data = rx->skb->data;
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
-
-	if (!ieee80211_is_data_qos(hdr->frame_control))
-		return RX_CONTINUE;
-
-	/* remove the qos control field, update frame type and meta-data */
-	memmove(data + IEEE80211_QOS_CTL_LEN, data,
-		ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
-	hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
-	/* change frame type to non QOS */
-	hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
-
-	return RX_CONTINUE;
-}
-
 static int
 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
 {
@@ -2718,7 +2699,6 @@ static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
 		if (ieee80211_vif_is_mesh(&rx->sdata->vif))
 			CALL_RXH(ieee80211_rx_h_mesh_fwding);
 #endif
-		CALL_RXH(ieee80211_rx_h_remove_qos_control)
 		CALL_RXH(ieee80211_rx_h_amsdu)
 		CALL_RXH(ieee80211_rx_h_data)
 		CALL_RXH(ieee80211_rx_h_ctrl);