From 111cac0e8092026a0583d070204dffd53dd980d1 Mon Sep 17 00:00:00 2001
From: ache <ache@FreeBSD.org>
Date: Thu, 1 Nov 2001 05:07:28 +0000
Subject: [PATCH] Add new interface function int
 devclass_find_free_unit(devclass_t dc, int unit); which return first free
 unit in given class starting from 'unit'.

---
 sys/kern/subr_bus.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
index d97f0f5e766b..6937b561d26b 100644
--- a/sys/kern/subr_bus.c
+++ b/sys/kern/subr_bus.c
@@ -341,6 +341,16 @@ devclass_get_maxunit(devclass_t dc)
 	return (dc->maxunit);
 }
 
+int
+devclass_find_free_unit(devclass_t dc, int unit)
+{
+	if (dc == NULL)
+		return (unit);
+	while (unit < dc->maxunit && dc->devices[unit] != NULL)
+		unit++;
+	return (unit);
+}
+
 static int
 devclass_alloc_unit(devclass_t dc, int *unitp)
 {