From 363b7d88f6832d32cc7e29d05598472c370a2d85 Mon Sep 17 00:00:00 2001
From: Sepherosa Ziehau <sephe@FreeBSD.org>
Date: Mon, 19 Sep 2016 07:07:23 +0000
Subject: [PATCH] hyperv/hn: Don't allow NVS and NDIS version change upon
reinitailization
NVS and NDIS version change would break too much assumption and static
configuration.
MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7919
---
sys/dev/hyperv/netvsc/hv_net_vsc.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/sys/dev/hyperv/netvsc/hv_net_vsc.c b/sys/dev/hyperv/netvsc/hv_net_vsc.c
index a64eb6227faa..204017f38281 100644
--- a/sys/dev/hyperv/netvsc/hv_net_vsc.c
+++ b/sys/dev/hyperv/netvsc/hv_net_vsc.c
@@ -495,6 +495,22 @@ hn_nvs_init(struct hn_softc *sc)
{
int i;
+ if (device_is_attached(sc->hn_dev)) {
+ /*
+ * NVS version and NDIS version MUST NOT be changed.
+ */
+ if (bootverbose) {
+ if_printf(sc->hn_ifp, "reinit NVS version 0x%x, "
+ "NDIS version %u.%u\n", sc->hn_nvs_ver,
+ HN_NDIS_VERSION_MAJOR(sc->hn_ndis_ver),
+ HN_NDIS_VERSION_MINOR(sc->hn_ndis_ver));
+ }
+ return (hn_nvs_doinit(sc, sc->hn_nvs_ver));
+ }
+
+ /*
+ * Find the supported NVS version and set NDIS version accordingly.
+ */
for (i = 0; i < nitems(hn_nvs_version); ++i) {
int error;