tipc: remove wrong use of NLM_F_MULTI

NLM_F_MULTI must be used only when a NLMSG_DONE message is sent. In fact,
it is sent only at the end of a dump.

Libraries like libnl will wait forever for NLMSG_DONE.

Fixes: 35b9dd7607f0 ("tipc: add bearer get/dump to new netlink api")
Fixes: 7be57fc69184 ("tipc: add link get/dump to new netlink api")
Fixes: 46f15c6794fb ("tipc: add media get/dump to new netlink api")
CC: Richard Alpe <[e-mail]>
CC: Jon Maloy <[e-mail]>
CC: Ying Xue <[e-mail]>
CC: [e-mail]
Signed-off-by: Nicolas Dichtel <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/tipc/bearer.c

···
 
 /* Caller should hold rtnl_lock to protect the bearer */
 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
-				struct tipc_bearer *bearer)
+				struct tipc_bearer *bearer, int nlflags)
 {
 	void *hdr;
 	struct nlattr *attrs;
 	struct nlattr *prop;
 
 	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
-			  NLM_F_MULTI, TIPC_NL_BEARER_GET);
+			  nlflags, TIPC_NL_BEARER_GET);
 	if (!hdr)
 		return -EMSGSIZE;
 
···
 		if (!bearer)
 			continue;
 
-		err = __tipc_nl_add_bearer(&msg, bearer);
+		err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
 		if (err)
 			break;
 	}
···
 		goto err_out;
 	}
 
-	err = __tipc_nl_add_bearer(&msg, bearer);
+	err = __tipc_nl_add_bearer(&msg, bearer, 0);
 	if (err)
 		goto err_out;
 	rtnl_unlock();
···
 }
 
 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
-			       struct tipc_media *media)
+			       struct tipc_media *media, int nlflags)
 {
 	void *hdr;
 	struct nlattr *attrs;
 	struct nlattr *prop;
 
 	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
-			  NLM_F_MULTI, TIPC_NL_MEDIA_GET);
+			  nlflags, TIPC_NL_MEDIA_GET);
 	if (!hdr)
 		return -EMSGSIZE;
 
···
 
 	rtnl_lock();
 	for (; media_info_array[i] != NULL; i++) {
-		err = __tipc_nl_add_media(&msg, media_info_array[i]);
+		err = __tipc_nl_add_media(&msg, media_info_array[i],
+					  NLM_F_MULTI);
 		if (err)
 			break;
 	}
···
 		goto err_out;
 	}
 
-	err = __tipc_nl_add_media(&msg, media);
+	err = __tipc_nl_add_media(&msg, media, 0);
 	if (err)
 		goto err_out;
 	rtnl_unlock();

net/tipc/link.c

···
 
 /* Caller should hold appropriate locks to protect the link */
 static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
-			      struct tipc_link *link)
+			      struct tipc_link *link, int nlflags)
 {
 	int err;
 	void *hdr;
···
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 
 	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
-			  NLM_F_MULTI, TIPC_NL_LINK_GET);
+			  nlflags, TIPC_NL_LINK_GET);
 	if (!hdr)
 		return -EMSGSIZE;
 
···
 		if (!node->links[i])
 			continue;
 
-		err = __tipc_nl_add_link(net, msg, node->links[i]);
+		err = __tipc_nl_add_link(net, msg, node->links[i], NLM_F_MULTI);
 		if (err)
 			return err;
 	}
···
 		goto err_out;
 	}
 
-	err = __tipc_nl_add_link(net, &msg, link);
+	err = __tipc_nl_add_link(net, &msg, link, 0);
 	if (err)
 		goto err_out;