mac80211: fix minor memleak on AP restart / warning on driver unload

Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/package/kernel/mac80211/patches/334-mac80211-fix-purging-multicast-PS-buffer-queue.patch b/package/kernel/mac80211/patches/334-mac80211-fix-purging-multicast-PS-buffer-queue.patch
new file mode 100644 (file)
index 0000000..dfcc6e4
--- /dev/null
+++ b/package/kernel/mac80211/patches/334-mac80211-fix-purging-multicast-PS-buffer-queue.patch
@@ -0,0 +1,54 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Tue, 2 Aug 2016 11:11:13 +0200
+Subject: [PATCH] mac80211: fix purging multicast PS buffer queue
+
+The code currently assumes that buffered multicast PS frames don't have
+a pending ACK frame for tx status reporting.
+However, hostapd sends a broadcast deauth frame on teardown for which tx
+status is requested. This can lead to the "Have pending ack frames"
+warning on module reload.
+Fix this by using ieee80211_free_txskb/ieee80211_purge_tx_queue.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/net/mac80211/cfg.c
++++ b/net/mac80211/cfg.c
+@@ -868,7 +868,7 @@ static int ieee80211_stop_ap(struct wiph
+ 
+       /* free all potentially still buffered bcast frames */
+       local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps.bc_buf);
+-      skb_queue_purge(&sdata->u.ap.ps.bc_buf);
++      ieee80211_purge_tx_queue(&local->hw, &sdata->u.ap.ps.bc_buf);
+ 
+       mutex_lock(&local->mtx);
+       ieee80211_vif_copy_chanctx_to_vlans(sdata, true);
+--- a/net/mac80211/tx.c
++++ b/net/mac80211/tx.c
+@@ -368,7 +368,7 @@ static void purge_old_ps_buffers(struct
+               skb = skb_dequeue(&ps->bc_buf);
+               if (skb) {
+                       purged++;
+-                      dev_kfree_skb(skb);
++                      ieee80211_free_txskb(&local->hw, skb);
+               }
+               total += skb_queue_len(&ps->bc_buf);
+       }
+@@ -451,7 +451,7 @@ ieee80211_tx_h_multicast_ps_buf(struct i
+       if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
+               ps_dbg(tx->sdata,
+                      "BC TX buffer full - dropping the oldest frame\n");
+-              dev_kfree_skb(skb_dequeue(&ps->bc_buf));
++              ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
+       } else
+               tx->local->total_ps_buffered++;
+ 
+@@ -4276,7 +4276,7 @@ ieee80211_get_buffered_bc(struct ieee802
+                       sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
+               if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
+                       break;
+-              dev_kfree_skb_any(skb);
++              ieee80211_free_txskb(hw, skb);
+       }
+ 
+       info = IEEE80211_SKB_CB(skb);