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Commit d84f3234 authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
Browse files

mac80211: remove dev_hold/put calls 



If we move the rcu sections a little, there's
no need to touch the device refcount.

Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 5f0b7de5

net/mac80211/tx.c

+5 −11
Original line number Diff line number Diff line
@@ -1430,8 +1430,6 @@ static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 
	int headroom;

	bool may_encrypt;



	dev_hold(sdata->dev);



	if (need_dynamic_ps(local)) {

		if (local->hw.conf.flags & IEEE80211_CONF_PS) {

			ieee80211_stop_queues_by_reason(&local->hw,
@@ -1446,6 +1444,8 @@ static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 


	info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;



	rcu_read_lock();



	if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {

		int hdrlen;

		u16 len_rthdr;
@@ -1468,7 +1468,6 @@ static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 
			 * support we will need a different mechanism.

			 */



			rcu_read_lock();

			list_for_each_entry_rcu(tmp_sdata, &local->interfaces,

						list) {

				if (!netif_running(tmp_sdata->dev))
@@ -1477,13 +1476,10 @@ static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 
					continue;

				if (compare_ether_addr(tmp_sdata->dev->dev_addr,

						       hdr->addr2) == 0) {

					dev_hold(tmp_sdata->dev);

					dev_put(sdata->dev);

					sdata = tmp_sdata;

					break;

				}

			}

			rcu_read_unlock();

		}

	}
@@ -1497,7 +1493,7 @@ static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 


	if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {

		dev_kfree_skb(skb);

		dev_put(sdata->dev);

		rcu_read_unlock();

		return;

	}
@@ -1508,13 +1504,13 @@ static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 
		!is_multicast_ether_addr(hdr->addr1))

			if (mesh_nexthop_lookup(skb, sdata)) {

				/* skb queued: don't free */

				dev_put(sdata->dev);

				rcu_read_unlock();

				return;

			}



	ieee80211_select_queue(local, skb);

	ieee80211_tx(sdata, skb, false);

	dev_put(sdata->dev);

	rcu_read_unlock();

}



netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
@@ -1964,12 +1960,10 @@ void ieee80211_tx_pending(unsigned long data) 
			}



			sdata = vif_to_sdata(info->control.vif);

			dev_hold(sdata->dev);

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,

						flags);



			txok = ieee80211_tx_pending_skb(local, skb);

			dev_put(sdata->dev);

			if (!txok)

				__skb_queue_head(&local->pending[i], skb);

			spin_lock_irqsave(&local->queue_stop_reason_lock,