Index: sys/compat/linuxkpi/common/src/linux_i2c.c
===================================================================
--- sys/compat/linuxkpi/common/src/linux_i2c.c
+++ sys/compat/linuxkpi/common/src/linux_i2c.c
@@ -221,7 +221,9 @@
 		return (ENXIO);
 	}
 
+	bus_topo_lock();
 	error = bus_generic_attach(adapter->dev.parent->bsddev);
+	bus_topo_unlock();
 	if (error) {
 		device_printf(adapter->dev.parent->bsddev,
 		  "failed to attach child: error %d\n", error);
@@ -249,7 +251,9 @@
 	while ((child = device_find_child(adapter->dev.parent->bsddev, "lkpi_iic", unit++)) != NULL) {
 
 		if (adapter == LKPI_IIC_GET_ADAPTER(child)) {
+			bus_topo_lock();
 			device_delete_child(adapter->dev.parent->bsddev, child);
+			bus_topo_unlock();
 			rv = 0;
 			goto out;
 		}
@@ -259,7 +263,9 @@
 	while ((child = device_find_child(adapter->dev.parent->bsddev, "lkpi_iicbb", unit++)) != NULL) {
 
 		if (adapter == LKPI_IIC_GET_ADAPTER(child)) {
+			bus_topo_lock();
 			device_delete_child(adapter->dev.parent->bsddev, child);
+			bus_topo_unlock();
 			rv = 0;
 			goto out;
 		}