From 39e6ba09c2ef18b6b6cc19ca5a7982325f7c356c Mon Sep 17 00:00:00 2001
From: Holger Hans Peter Freyther <zecke@selfish.org>
Date: Mon, 15 Nov 2010 20:43:02 +0100
Subject: [PATCH] oml: In case we get a NACK, drop the OML connection and hope
 for the best

Assume that a NACK is a onetime failure and that on the next
attempt it will work better. If that is not the case we might
even send a reboot to the BTS.
---
 openbsc/src/bsc_init.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/openbsc/src/bsc_init.c b/openbsc/src/bsc_init.c
index 7a08e27d4..d3edd9e84 100644
--- a/openbsc/src/bsc_init.c
+++ b/openbsc/src/bsc_init.c
@@ -33,6 +33,7 @@
 #include <openbsc/signal.h>
 #include <openbsc/chan_alloc.h>
 #include <osmocore/talloc.h>
+#include <openbsc/ipaccess.h>
 
 /* global pointer to the gsm network data structure */
 extern struct gsm_network *bsc_gsmnet;
@@ -565,10 +566,20 @@ static int sw_activ_rep(struct msgb *mb)
 /* Callback function for NACK on the OML NM */
 static int oml_msg_nack(struct nm_nack_signal_data *nack)
 {
+	int i;
+
 	if (nack->mt == NM_MT_SET_BTS_ATTR_NACK) {
+
 		LOGP(DNM, LOGL_FATAL, "Failed to set BTS attributes. That is fatal. "
 				"Was the bts type and frequency properly specified?\n");
 		exit(-1);
+	} else {
+		LOGP(DNM, LOGL_ERROR, "Got a NACK going to drop the OML links.\n");
+		for (i = 0; i < bsc_gsmnet->num_bts; ++i) {
+			struct gsm_bts *bts = gsm_bts_num(bsc_gsmnet, i);
+			if (is_ipaccess_bts(bts))
+				ipaccess_drop_oml(bts);
+		}
 	}
 
 	return 0;