mac80211: remove offchannel_tx API

For iwlwifi, I decided not to use this API since
it just increased the complexity for little gain.
Since nobody else intends to use it, let's kill
it again. If anybody later needs to have it, we
can always revive it then.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

include/net/mac80211.h

@@ -1895,11 +1895,6 @@ enum ieee80211_tx_sync_type {
  *	ieee80211_remain_on_channel_expired(). This callback may sleep.
  * @cancel_remain_on_channel: Requests that an ongoing off-channel period is
  *	aborted before it expires. This callback may sleep.
- * @offchannel_tx: Transmit frame on another channel, wait for a response
- *	and return. Reliable TX status must be reported for the frame. If the
- *	return value is 1, then the @remain_on_channel will be used with a
- *	regular transmission (if supported.)
- * @offchannel_tx_cancel_wait: cancel wait associated with offchannel TX
  *
  * @set_ringparam: Set tx and rx ring sizes.
  *
@@ -2018,11 +2013,6 @@ struct ieee80211_ops {
 				 enum nl80211_channel_type channel_type,
 				 int duration);
 	int (*cancel_remain_on_channel)(struct ieee80211_hw *hw);
-	int (*offchannel_tx)(struct ieee80211_hw *hw, struct sk_buff *skb,
-			     struct ieee80211_channel *chan,
-			     enum nl80211_channel_type channel_type,
-			     unsigned int wait);
-	int (*offchannel_tx_cancel_wait)(struct ieee80211_hw *hw);
 	int (*set_ringparam)(struct ieee80211_hw *hw, u32 tx, u32 rx);
 	void (*get_ringparam)(struct ieee80211_hw *hw,
 			      u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max);

net/mac80211/cfg.c

@@ -1898,33 +1898,6 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct net_device *dev,
 
 	*cookie = (unsigned long) skb;
 
-	if (is_offchan && local->ops->offchannel_tx) {
-		int ret;
-
-		IEEE80211_SKB_CB(skb)->band = chan->band;
-
-		mutex_lock(&local->mtx);
-
-		if (local->hw_offchan_tx_cookie) {
-			mutex_unlock(&local->mtx);
-			return -EBUSY;
-		}
-
-		/* TODO: bitrate control, TX processing? */
-		ret = drv_offchannel_tx(local, skb, chan, channel_type, wait);
-
-		if (ret == 0)
-			local->hw_offchan_tx_cookie = *cookie;
-		mutex_unlock(&local->mtx);
-
-		/*
-		 * Allow driver to return 1 to indicate it wants to have the
-		 * frame transmitted with a remain_on_channel + regular TX.
-		 */
-		if (ret != 1)
-			return ret;
-	}
-
 	if (is_offchan && local->ops->remain_on_channel) {
 		unsigned int duration;
 		int ret;
@@ -2011,18 +1984,6 @@ static int ieee80211_mgmt_tx_cancel_wait(struct wiphy *wiphy,
 
 	mutex_lock(&local->mtx);
 
-	if (local->ops->offchannel_tx_cancel_wait &&
-	    local->hw_offchan_tx_cookie == cookie) {
-		ret = drv_offchannel_tx_cancel_wait(local);
-
-		if (!ret)
-			local->hw_offchan_tx_cookie = 0;
-
-		mutex_unlock(&local->mtx);
-
-		return ret;
-	}
-
 	if (local->ops->cancel_remain_on_channel) {
 		cookie ^= 2;
 		ret = ieee80211_cancel_remain_on_channel_hw(local, cookie);

net/mac80211/driver-ops.h

@@ -590,37 +590,6 @@ static inline int drv_cancel_remain_on_channel(struct ieee80211_local *local)
 	return ret;
 }
 
-static inline int drv_offchannel_tx(struct ieee80211_local *local,
-				    struct sk_buff *skb,
-				    struct ieee80211_channel *chan,
-				    enum nl80211_channel_type channel_type,
-				    unsigned int wait)
-{
-	int ret;
-
-	might_sleep();
-
-	trace_drv_offchannel_tx(local, skb, chan, channel_type, wait);
-	ret = local->ops->offchannel_tx(&local->hw, skb, chan,
-					channel_type, wait);
-	trace_drv_return_int(local, ret);
-
-	return ret;
-}
-
-static inline int drv_offchannel_tx_cancel_wait(struct ieee80211_local *local)
-{
-	int ret;
-
-	might_sleep();
-
-	trace_drv_offchannel_tx_cancel_wait(local);
-	ret = local->ops->offchannel_tx_cancel_wait(&local->hw);
-	trace_drv_return_int(local, ret);
-
-	return ret;
-}
-
 static inline int drv_set_ringparam(struct ieee80211_local *local,
 				    u32 tx, u32 rx)
 {

net/mac80211/ieee80211_i.h

@@ -1002,7 +1002,6 @@ struct ieee80211_local {
 	unsigned int hw_roc_duration;
 	u32 hw_roc_cookie;
 	bool hw_roc_for_tx;
-	unsigned long hw_offchan_tx_cookie;
 
 	/* dummy netdev for use w/ NAPI */
 	struct net_device napi_dev;

net/mac80211/status.c

@@ -345,9 +345,6 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 			local->hw_roc_skb_for_status = NULL;
 		}
 
-		if (cookie == local->hw_offchan_tx_cookie)
-			local->hw_offchan_tx_cookie = 0;
-
 		cfg80211_mgmt_tx_status(
 			skb->dev, cookie, skb->data, skb->len,
 			!!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC);