D42414.id129619.diff
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D42414.id129619.diff
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	diff --git a/sys/dev/hyperv/vmbus/vmbus.c b/sys/dev/hyperv/vmbus/vmbus.c
	--- a/sys/dev/hyperv/vmbus/vmbus.c
	+++ b/sys/dev/hyperv/vmbus/vmbus.c
	@@ -1393,7 +1393,7 @@
	int ret;
	device_t dev_res;
	ACPI_HANDLE handle;
	- unsigned int coherent;
	+ unsigned int coherent = 0;

	if (sc->vmbus_flags & VMBUS_FLAG_ATTACHED)
	return (0);
	@@ -1416,10 +1416,12 @@

	/* Coherency attribute */
	dev_res = devclass_get_device(devclass_find("vmbus_res"), 0);
	- handle = acpi_get_handle(dev_res);
	+ if (dev_res != NULL) {
	+ handle = acpi_get_handle(dev_res);

	- if (ACPI_FAILURE(acpi_GetInteger(handle, "_CCA", &coherent)))
	- coherent = 0;
	+ if (ACPI_FAILURE(acpi_GetInteger(handle, "_CCA", &coherent)))
	+ coherent = 0;
	+ }
	if (bootverbose)
	device_printf(sc->vmbus_dev, "Bus is%s cache-coherent\n",
	coherent ? "" : " not");