From 04fc672ad67bb087a58487bea70f58aa91565c76 Mon Sep 17 00:00:00 2001
From: Yoshihiro Takahashi <nyan@FreeBSD.org>
Date: Sat, 24 Jul 2004 15:13:42 +0000
Subject: [PATCH] Merged from sys/dev/sio/sio.c revision 1.450.

---
 sys/pc98/cbus/sio.c | 3 ++-
 sys/pc98/pc98/sio.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/sys/pc98/cbus/sio.c b/sys/pc98/cbus/sio.c
index 636d75356f4..210e21ef9fe 100644
--- a/sys/pc98/cbus/sio.c
+++ b/sys/pc98/cbus/sio.c
@@ -785,7 +785,8 @@ siodetach(dev)
 		return (0);
 	}
 	com->gone = TRUE;
-	ttygone(com->tp);
+	if (com->tp)
+		ttygone(com->tp);
 	for (i = 0 ; i < 6; i++)
 		destroy_dev(com->devs[i]);
 	if (com->irqres) {
diff --git a/sys/pc98/pc98/sio.c b/sys/pc98/pc98/sio.c
index 636d75356f4..210e21ef9fe 100644
--- a/sys/pc98/pc98/sio.c
+++ b/sys/pc98/pc98/sio.c
@@ -785,7 +785,8 @@ siodetach(dev)
 		return (0);
 	}
 	com->gone = TRUE;
-	ttygone(com->tp);
+	if (com->tp)
+		ttygone(com->tp);
 	for (i = 0 ; i < 6; i++)
 		destroy_dev(com->devs[i]);
 	if (com->irqres) {