--- sys/kern/subr_bus.c.orig	2010-12-02 13:28:01.000000000 +0900
+++ sys/kern/subr_bus.c	2010-12-08 12:37:05.524727855 +0900
@@ -3385,15 +3385,13 @@ int
 bus_generic_suspend(device_t dev)
 {
 	int		error;
-	device_t	child, child2;
+	device_t	child;
 
-	TAILQ_FOREACH(child, &dev->children, link) {
+	TAILQ_FOREACH_REVERSE(child, &dev->children, device_list, link) {
 		error = DEVICE_SUSPEND(child);
 		if (error) {
-			for (child2 = TAILQ_FIRST(&dev->children);
-			     child2 && child2 != child;
-			     child2 = TAILQ_NEXT(child2, link))
-				DEVICE_RESUME(child2);
+			while ((child = TAILQ_NEXT(child, link)) != NULL)
+				DEVICE_RESUME(child);
 			return (error);
 		}
 	}