D20458.diff
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	Index: head/sys/sys/bus.h
	===================================================================
	--- head/sys/sys/bus.h
	+++ head/sys/sys/bus.h
	@@ -810,16 +810,30 @@
	static __inline type varp ## _get_ ## var(device_t dev) \
	{ \
	uintptr_t v; \
	- BUS_READ_IVAR(device_get_parent(dev), dev, \
	+ int e; \
	+ e = BUS_READ_IVAR(device_get_parent(dev), dev, \
	ivarp ## _IVAR_ ## ivar, &v); \
	+ if (e != 0) { \
	+ device_printf(dev, "failed to read ivar " \
	+ __XSTRING(ivarp ## _IVAR_ ## ivar) " on bus %s, " \
	+ "error = %d\n", \
	+ device_get_nameunit(device_get_parent(dev)), e); \
	+ } \
	return ((type) v); \
	} \
	\
	static __inline void varp ## _set_ ## var(device_t dev, type t) \
	{ \
	uintptr_t v = (uintptr_t) t; \
	- BUS_WRITE_IVAR(device_get_parent(dev), dev, \
	+ int e; \
	+ e = BUS_WRITE_IVAR(device_get_parent(dev), dev, \
	ivarp ## _IVAR_ ## ivar, v); \
	+ if (e != 0) { \
	+ device_printf(dev, "failed to write ivar " \
	+ __XSTRING(ivarp ## _IVAR_ ## ivar) " on bus %s, " \
	+ "error = %d\n", \
	+ device_get_nameunit(device_get_parent(dev)), e); \
	+ } \
	}

	/**