From 49b21ad65b2941528116d8994080024d9fa4c7b4 Mon Sep 17 00:00:00 2001
From: Matthew Dillon <dillon@dragonflybsd.org>
Date: Sat, 23 Aug 2003 16:58:36 +0000
Subject: [PATCH] Allow a NULL dev to be passed to _devsw().  This should close
 any remaining kernel panics related to non-existant devices.

---
 sys/kern/kern_device.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/kern/kern_device.c b/sys/kern/kern_device.c
index 256c1bf916..a22cfa9430 100644
--- a/sys/kern/kern_device.c
+++ b/sys/kern/kern_device.c
@@ -25,7 +25,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $DragonFly: src/sys/kern/kern_device.c,v 1.4 2003/08/12 02:36:15 dillon Exp $
+ * $DragonFly: src/sys/kern/kern_device.c,v 1.5 2003/08/23 16:58:36 dillon Exp $
  */
 #include <sys/param.h>
 #include <sys/kernel.h>
@@ -175,6 +175,8 @@ static __inline
 struct cdevsw *
 _devsw(dev_t dev)
 {
+    if (dev == NULL)
+	return(NULL);
     if (dev->si_devsw)
 	return (dev->si_devsw);
     return(cdevsw[major(dev)]);
-- 
2.41.0