D6860.id18269.diff
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	Index: head/sys/dev/hyperv/vmbus/vmbus.c
	===================================================================
	--- head/sys/dev/hyperv/vmbus/vmbus.c
	+++ head/sys/dev/hyperv/vmbus/vmbus.c
	@@ -100,6 +100,8 @@
	uint32_t);
	static int vmbus_req_channels(struct vmbus_softc *sc);

	+static int vmbus_sysctl_version(SYSCTL_HANDLER_ARGS);
	+
	static struct vmbus_msghc_ctx *vmbus_msghc_ctx_create(bus_dma_tag_t);
	static void vmbus_msghc_ctx_destroy(
	struct vmbus_msghc_ctx *);
	@@ -948,6 +950,17 @@
	}

	static int
	+vmbus_sysctl_version(SYSCTL_HANDLER_ARGS)
	+{
	+ char verstr[16];
	+
	+ snprintf(verstr, sizeof(verstr), "%u.%u",
	+ hv_vmbus_protocal_version >> 16,
	+ hv_vmbus_protocal_version & 0xffff);
	+ return sysctl_handle_string(oidp, verstr, sizeof(verstr), req);
	+}
	+
	+static int
	vmbus_probe(device_t dev)
	{
	char *id[] = { "VMBUS", NULL };
	@@ -977,6 +990,8 @@
	static int
	vmbus_doattach(struct vmbus_softc *sc)
	{
	+ struct sysctl_oid_list *child;
	+ struct sysctl_ctx_list *ctx;
	int ret;

	if (sc->vmbus_flags & VMBUS_FLAG_ATTACHED)
	@@ -1040,6 +1055,12 @@
	bus_generic_attach(sc->vmbus_dev);
	device_printf(sc->vmbus_dev, "device scan, probe and attach done\n");

	+ ctx = device_get_sysctl_ctx(sc->vmbus_dev);
	+ child = SYSCTL_CHILDREN(device_get_sysctl_tree(sc->vmbus_dev));
	+ SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "version",
	+ CTLTYPE_STRING \| CTLFLAG_RD \| CTLFLAG_MPSAFE, NULL, 0,
	+ vmbus_sysctl_version, "A", "vmbus version");
	+
	return (ret);

	cleanup: