From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 10 Mar 2012 13:31:31 +0000 (+0000)
Subject: mac80211: limit TID buffering to prevent out-of-memory issues on low-memory systems
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=14d09d570f8a0808dedc4f175b9074f227f9b3a2;p=openwrt%2Fstaging%2F981213.git

mac80211: limit TID buffering to prevent out-of-memory issues on low-memory systems

SVN-Revision: 30870
---

diff --git a/package/mac80211/patches/300-pending_work.patch b/package/mac80211/patches/300-pending_work.patch
index 0ca6a02b5f..25d3b17441 100644
--- a/package/mac80211/patches/300-pending_work.patch
+++ b/package/mac80211/patches/300-pending_work.patch
@@ -615,6 +615,28 @@
  #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
  		printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n",
  		       sta->sta.addr, sta->sta.aid, ac);
+@@ -1060,6 +1065,7 @@ static bool ieee80211_tx_prep_agg(struct
+ {
+ 	bool queued = false;
+ 	bool reset_agg_timer = false;
++	struct sk_buff *purge_skb = NULL;
+ 
+ 	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
+ 		info->flags |= IEEE80211_TX_CTL_AMPDU;
+@@ -1101,8 +1107,13 @@ static bool ieee80211_tx_prep_agg(struct
+ 			info->control.vif = &tx->sdata->vif;
+ 			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
+ 			__skb_queue_tail(&tid_tx->pending, skb);
++			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
++				purge_skb = __skb_dequeue(&tid_tx->pending);
+ 		}
+ 		spin_unlock(&tx->sta->lock);
++
++		if (purge_skb)
++			dev_kfree_skb(purge_skb);
+ 	}
+ 
+ 	/* reset session timer */
 --- a/net/mac80211/ieee80211_i.h
 +++ b/net/mac80211/ieee80211_i.h
 @@ -480,7 +480,7 @@ struct ieee80211_if_ibss {
diff --git a/package/mac80211/patches/563-mac80211_optimize_mcs_rate_mask.patch b/package/mac80211/patches/563-mac80211_optimize_mcs_rate_mask.patch
index 316663856c..534824f09a 100644
--- a/package/mac80211/patches/563-mac80211_optimize_mcs_rate_mask.patch
+++ b/package/mac80211/patches/563-mac80211_optimize_mcs_rate_mask.patch
@@ -68,7 +68,7 @@
  	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
  		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
  		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
-@@ -2455,8 +2457,6 @@ struct sk_buff *ieee80211_beacon_get_tim
+@@ -2461,8 +2463,6 @@ struct sk_buff *ieee80211_beacon_get_tim
  		txrc.max_rate_idx = -1;
  	else
  		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;