From 1539af1ef5b902e8c105c6ed08a3b3c39258ede8 Mon Sep 17 00:00:00 2001
From: Sam Leffler <sam@FreeBSD.org>
Date: Wed, 15 Feb 2006 18:12:24 +0000
Subject: [PATCH] close race between ath_tx_start and ath_tx_processq

Reviewed by:	apatti
MFC after:	1 week
---
 sys/dev/ath/if_ath.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/dev/ath/if_ath.c b/sys/dev/ath/if_ath.c
index f0704279d8ef..c0cb1500b606 100644
--- a/sys/dev/ath/if_ath.c
+++ b/sys/dev/ath/if_ath.c
@@ -3766,7 +3766,6 @@ ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
 		txq->axq_intrcnt = 0;	/* reset periodic desc intr count */
 		bf = STAILQ_FIRST(&txq->axq_q);
 		if (bf == NULL) {
-			txq->axq_link = NULL;
 			ATH_TXQ_UNLOCK(txq);
 			break;
 		}
@@ -3782,6 +3781,8 @@ ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
 			break;
 		}
 		ATH_TXQ_REMOVE_HEAD(txq, bf_list);
+		if (txq->axq_depth == 0)
+			txq->axq_link = NULL;
 		ATH_TXQ_UNLOCK(txq);
 
 		ni = bf->bf_node;