From db4f318c421ef1a74c0a65390acfdf93309b9245 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 19 Jan 1993 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1993-01-19

---
 pc/adaptec.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pc/adaptec.c b/pc/adaptec.c
index bd2ae34647a399efcda31b90569266fec59dbf9a..64a1309e49db8f0840987d88f78622c0e3761c97 100644
--- a/pc/adaptec.c
+++ b/pc/adaptec.c
@@ -367,8 +367,10 @@ scsiio(int bus, Scsi *p, int rw)
 int
 scsiexec(Scsi *p, int rw)
 {
-	USED(rw);
+	Ctlr *ctlr = &softctlr[0];
 
+	if(ctlr->port == 0)
+		error(Enodev);
 	if(p->target == CtlrID)
 		return 0x6002;