[PATCH 3.10 266/319] mac80211: fix purging multicast PS buffer queue

Willy Tarreau
2017-02-05T20:02:26Z

From: Felix Fietkau <nbd@nbd.name>

commit 6b07d9ca9b5363dda959b9582a3fc9c0b89ef3b5 upstream.

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>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
net/mac80211/cfg.c | 2 +-
net/mac80211/tx.c | 6 +++---
2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index e922bf3..11a10d5 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1072,7 +1072,7 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)

/* 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);

ieee80211_vif_copy_chanctx_to_vlans(sdata, true);
ieee80211_vif_release_channel(sdata);
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index e960fbe..1299053 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -335,7 +335,7 @@ static void purge_old_ps_buffers(struct ieee80211_local *local)
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);
}
@@ -417,7 +417,7 @@ ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
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++;

@@ -2711,7 +2711,7 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
if (!ieee80211_tx_prepare(sdata, &tx, skb))
break;
- dev_kfree_skb_any(skb);
+ ieee80211_free_txskb(hw, skb);
}

info = IEEE80211_SKB_CB(skb);
--
2.8.0.rc2.1.gbe9624a