linux-kernel - [21/38] ath9k: another fix for the A-MPDU buffer leak

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Date:	Fri, 06 Aug 2010 11:30:42 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Felix Fietkau <nbd@...nwrt.org>,
	"John W. Linville" <linville@...driver.com>
Subject: [21/38] ath9k: another fix for the A-MPDU buffer leak

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Felix Fietkau <nbd@...nwrt.org>

commit 31e79a5954b78fbed15de2c8974d5a2b6019199a upstream.

The patch 'ath9k: fix a buffer leak in A-MPDU completion' addressed the
issue of running out of buffers/descriptors in the tx path if a STA is
deleted while tx status feedback is still pending.
The remaining issue is that the skbs of the buffers are not reclaimed,
leaving a memory leak.
This patch fixes this issue by running the buffers through
ath_tx_complete_buf(), ensuring that the pending frames counter is also
updated.

Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/wireless/ath/ath9k/xmit.c |   19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -329,7 +329,6 @@ static void ath_tx_complete_aggr(struct
 	int isaggr, txfail, txpending, sendbar = 0, needreset = 0, nbad = 0;
 	bool rc_update = true;
 	struct ieee80211_tx_rate rates[4];
-	unsigned long flags;
 
 	skb = bf->bf_mpdu;
 	hdr = (struct ieee80211_hdr *)skb->data;
@@ -346,9 +345,21 @@ static void ath_tx_complete_aggr(struct
 	if (!sta) {
 		rcu_read_unlock();
 
-		spin_lock_irqsave(&sc->tx.txbuflock, flags);
-		list_splice_tail_init(bf_q, &sc->tx.txbuf);
-		spin_unlock_irqrestore(&sc->tx.txbuflock, flags);
+		INIT_LIST_HEAD(&bf_head);
+		while (bf) {
+			bf_next = bf->bf_next;
+
+			bf->bf_state.bf_type |= BUF_XRETRY;
+			if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) ||
+			    !bf->bf_stale || bf_next != NULL)
+				list_move_tail(&bf->list, &bf_head);
+
+			ath_tx_rc_status(bf, ts, 0, 0, false);
+			ath_tx_complete_buf(sc, bf, txq, &bf_head, ts,
+				0, 0);
+
+			bf = bf_next;
+		}
 		return;
 	}
 


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