File 0016-drbd-Fix-net-options-set-defaults-to-not-clear-the-t.patch of Package drbd

From 69d9286628b730870665cd2c6f05dd9f1813c65e Mon Sep 17 00:00:00 2001
From: Philipp Reisner <philipp.reisner@linbit.com>
Date: Sun, 17 Sep 2023 22:21:11 +0800
Subject: [PATCH 16/20] drbd: Fix `net-options --set-defaults` to not clear the
 transport

So far, `drbdsetup net-options --set-defaults` cleared the
transport_name. That is a stupid bug that caused `drbdadm adjust` to
do a disconnect/connect cycle. This affected `lb-tcp` and `rdma`. As
`tcp` is the default, it was not affected by this.
---
 drbd/drbd_nl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drbd/drbd_nl.c b/drbd/drbd_nl.c
index 8c968cf252ca..b0a1e6fa46f1 100644
--- a/drbd/drbd_nl.c
+++ b/drbd/drbd_nl.c
@@ -3729,6 +3729,11 @@ int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
 	if (should_set_defaults(info))
 		set_net_conf_defaults(new_net_conf);
 
+	/* The transport_name is immutable taking precedence over set_net_conf_defaults() */
+	memcpy(new_net_conf->transport_name, old_net_conf->transport_name,
+	       old_net_conf->transport_name_len);
+	new_net_conf->transport_name_len = old_net_conf->transport_name_len;
+
 	err = net_conf_from_attrs_for_change(new_net_conf, info);
 	if (err && err != -ENOMSG) {
 		retcode = ERR_MANDATORY_TAG;
-- 
2.35.3