From 4332304f561bc3b918e157317f574dfcb1cde8cd Mon Sep 17 00:00:00 2001
From: Justin Hibbits <jhibbits@FreeBSD.org>
Date: Sat, 24 Sep 2016 05:27:12 +0000
Subject: [PATCH] Fix ds1307 probing

'compat' can never be NULL, because the compatible check loop ends when
compat->ocd_str is NULL.  This causes ds1307 to attach to any unclaimed i2c
device.
---
 sys/dev/iicbus/ds1307.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/dev/iicbus/ds1307.c b/sys/dev/iicbus/ds1307.c
index 987db0d0e75..bd00cda3684 100644
--- a/sys/dev/iicbus/ds1307.c
+++ b/sys/dev/iicbus/ds1307.c
@@ -274,7 +274,7 @@ ds1307_probe(device_t dev)
 
 	compat = ofw_bus_search_compatible(dev, ds1307_compat_data);
 
-	if (compat == NULL)
+	if (compat->ocd_str == NULL)
 		return (ENXIO);
 
 	device_set_desc(dev, (const char *)compat->ocd_data);