From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 20 Jun 2013 13:11:31 +0000 (+0200)
Subject: ath9k: fix queue depth accounting in ath_tx_txqaddbuf
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f56e121df34563475f71efab38287b9ac028fe8c;p=linux-beck.git

ath9k: fix queue depth accounting in ath_tx_txqaddbuf

ath_tx_txqaddbuf assumes that all the linked buffers in the queue passed
to it are part of the same A-MPDU or MPDU. The CAB queue rework violates
this assumption, which can cause the internal queue depth to go
negative.
Fix this by increasing the counter for all slots of [bf, bf->bf_lastbf]

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 7e19d9b5214e..bfb58a5f2fd0 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1778,9 +1778,13 @@ static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq,
 	}
 
 	if (!internal) {
-		txq->axq_depth++;
-		if (bf_is_ampdu_not_probing(bf))
-			txq->axq_ampdu_depth++;
+		while (bf) {
+			txq->axq_depth++;
+			if (bf_is_ampdu_not_probing(bf))
+				txq->axq_ampdu_depth++;
+
+			bf = bf->bf_lastbf->bf_next;
+		}
 	}
 }