Add a default method for BUS_ADD_CHILD() that just calls

device_add_child_ordered().  Previously, a device driver that wanted to
add a new child device in its identify routine had to know if the parent
driver had a custom bus_add_child method and use BUS_ADD_CHILD() in that
case, otherwise use device_add_child().  Getting it wrong in either
direction would result in panics or failure to add the child device.  Now,
BUS_ADD_CHILD() always works isolating child drivers from having to know
intimate details about the parent driver.

Discussed with:	imp
MFC after:	1 week

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/kern/bus_if.m b/sys/kern/bus_if.m
index 529b506f1b68..bd848f2b7d2d 100644
--- a/sys/kern/bus_if.m
+++ b/sys/kern/bus_if.m
@@ -194,7 +194,7 @@ METHOD device_t add_child {
 	int _order;
 	const char *_name;
 	int _unit;
-};
+} DEFAULT bus_generic_add_child;
 
 /**
  * @brief Allocate a system resource