From 952053eb1cbecdd71954971c38b40e8a83a8ad88 Mon Sep 17 00:00:00 2001
From: fjoe <fjoe@FreeBSD.org>
Date: Mon, 5 Jun 2006 20:06:29 +0000
Subject: Fix kernel panic in rt2661_tx_intr() if no frames has been sent.

Obtained from:	OpenBSD (sys/dev/ic/rt2661.c rev. 1.15)
---
 sys/dev/ral/rt2661.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'sys/dev/ral')

diff --git a/sys/dev/ral/rt2661.c b/sys/dev/ral/rt2661.c
index 408a6f2..74b2856 100644
--- a/sys/dev/ral/rt2661.c
+++ b/sys/dev/ral/rt2661.c
@@ -962,6 +962,10 @@ rt2661_tx_intr(struct rt2661_softc *sc)
 		data = &txq->data[txq->stat];
 		rn = (struct rt2661_node *)data->ni;
 
+		/* if no frame has been sent, ignore */
+		if (rn == NULL)
+			continue;
+
 		switch (RT2661_TX_RESULT(val)) {
 		case RT2661_TX_SUCCESS:
 			retrycnt = RT2661_TX_RETRYCNT(val);
-- 
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