From f40a29157efe1e9e827e1ee2bd6ee6f8dc81886a Mon Sep 17 00:00:00 2001
From: Hidetoshi Shimokawa <simokawa@FreeBSD.org>
Date: Tue, 12 Aug 2003 13:01:27 +0000
Subject: [PATCH] Validate number of iso. DMA channels.

---
 sys/dev/firewire/fwohci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/dev/firewire/fwohci.c b/sys/dev/firewire/fwohci.c
index b007f7646a7..445dd661514 100644
--- a/sys/dev/firewire/fwohci.c
+++ b/sys/dev/firewire/fwohci.c
@@ -600,6 +600,8 @@ fwohci_init(struct fwohci_softc *sc, device_t dev)
 			break;
 	sc->fc.nisodma = i;
 	device_printf(dev, "No. of Isochronous channel is %d.\n", i);
+	if (i == 0)
+		return (ENXIO);
 
 	sc->fc.arq = &sc->arrq.xferq;
 	sc->fc.ars = &sc->arrs.xferq;