From e0b21313b6ff9efca69da270533ce582636f231d Mon Sep 17 00:00:00 2001
From: dyoung <dyoung@NetBSD.org>
Date: Tue, 8 Jan 2008 06:27:46 +0000
Subject: [PATCH] In device_foreach_child(), use a safe idiom for walking a
 list whose elements we might be deleting.  This stops us from crashing in
 config_detach_children().

---
 sys/kern/subr_autoconf.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/sys/kern/subr_autoconf.c b/sys/kern/subr_autoconf.c
index 330b4e02bdb8..b15648ccdee8 100644
--- a/sys/kern/subr_autoconf.c
+++ b/sys/kern/subr_autoconf.c
@@ -1,4 +1,4 @@
-/* $NetBSD: subr_autoconf.c,v 1.127 2008/01/04 21:18:12 ad Exp $ */
+/* $NetBSD: subr_autoconf.c,v 1.128 2008/01/08 06:27:46 dyoung Exp $ */
 
 /*
  * Copyright (c) 1996, 2000 Christopher G. Demetriou
@@ -77,7 +77,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: subr_autoconf.c,v 1.127 2008/01/04 21:18:12 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: subr_autoconf.c,v 1.128 2008/01/08 06:27:46 dyoung Exp $");
 
 #include "opt_multiprocessor.h"
 #include "opt_ddb.h"
@@ -1738,9 +1738,10 @@ device_parent(device_t dev)
 bool
 device_foreach_child(device_t parent, bool (*func)(device_t, void *), void *arg)
 {
-	device_t curdev;
+	device_t curdev, nextdev;
 
-	TAILQ_FOREACH(curdev, &alldevs, dv_list) {
+	for (curdev = TAILQ_FIRST(&alldevs); curdev != NULL; curdev = nextdev) {
+		nextdev = TAILQ_NEXT(curdev, dv_list);
 		if (device_parent(curdev) != parent)
 			continue;
 		if (!(*func)(curdev, arg))