D53414.diff
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	diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
	--- a/sys/kern/subr_bus.c
	+++ b/sys/kern/subr_bus.c
	@@ -572,6 +572,8 @@
	{
	devclass_t dc;

	+ bus_topo_assert();
	+
	PDEBUG(("looking for %s", classname));
	if (!classname)
	return (NULL);
	@@ -712,6 +714,8 @@
	devclass_t child_dc;
	const char *parentname;

	+ bus_topo_assert();
	+
	PDEBUG(("%s", DRIVERNAME(driver)));

	/* Don't allow invalid pass values. */
	@@ -784,6 +788,8 @@
	device_t dev;
	int error, i;

	+ bus_topo_assert();
	+
	/*
	* Disassociate from any devices. We iterate through all the
	* devices in the devclass of the driver and detach any which are
	@@ -856,6 +862,8 @@
	driverlink_t dl;
	int error;

	+ bus_topo_assert();
	+
	PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass)));

	if (!dc)
	@@ -913,6 +921,8 @@
	int i;
	int error;

	+ bus_topo_assert();
	+
	PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass)));

	if (!dc)
	@@ -964,6 +974,8 @@
	{
	driverlink_t dl;

	+ bus_topo_assert();
	+
	PDEBUG(("%s in devclass %s", classname, DEVCLANAME(dc)));

	TAILQ_FOREACH(dl, &dc->drivers, link) {
	@@ -5255,6 +5267,8 @@
	kobj_class_t driver;
	int error, pass;

	+ bus_topo_lock();
	+
	dmd = (struct driver_module_data *)arg;
	bus_devclass = devclass_find_internal(dmd->dmd_busname, NULL, TRUE);
	error = 0;
	@@ -5297,6 +5311,8 @@
	break;
	}

	+ bus_topo_unlock();
	+
	return (error);
	}