Change in osmo-mgw[master]: send DLCX only once

[laforge]

laforge has submitted this change. ( https://gerrit.osmocom.org/c/osmo-mgw/+/24143 )

Change subject: send DLCX only once
......................................................................

send DLCX only once

If the mgcp_client_fsm gets terminated in ST_DLCX_RESP, it has already
sent a DLCX to the MGW. So do not send a second one.

I noticed the duplicate DLCX for the same endpoint conn identifier while
running TTCN3 tests and watching the network trace of test teardown.

Change-Id: I35e415f67946b73c74408afe265618cfe4f72b0b
---
M src/libosmo-mgcp-client/mgcp_client_fsm.c
1 file changed, 4 insertions(+), 2 deletions(-)

Approvals:
  laforge: Looks good to me, approved
  pespin: Looks good to me, but someone else must approve
  Jenkins Builder: Verified



diff --git a/src/libosmo-mgcp-client/mgcp_client_fsm.c b/src/libosmo-mgcp-client/mgcp_client_fsm.c
index 83dd2f1..9e4a100 100644
--- a/src/libosmo-mgcp-client/mgcp_client_fsm.c
+++ b/src/libosmo-mgcp-client/mgcp_client_fsm.c
@@ -521,8 +521,10 @@
 	/* Should the FSM be terminated while there are still open connections
 	 * on the MGW, we send an unconditional DLCX to terminate the
 	 * connection. This is not the normal case. The user should always use
-	 * mgcp_conn_delete() to instruct the FSM to perform a graceful exit */
-	if (strlen(mgcp_ctx->conn_id)) {
+	 * mgcp_conn_delete() to instruct the FSM to perform a graceful exit.
+	 * If in ST_DLCX_RESP, a DLCX was already sent and we did not get a
+	 * response. No point in sending another one. */
+	if (fi->state != ST_DLCX_RESP && strlen(mgcp_ctx->conn_id)) {
 		LOGPFSML(fi, LOGL_NOTICE,
 			 "MGW/DLCX: FSM termination with connections still present, sending unconditional DLCX...\n");
 		msg = make_dlcx_msg(mgcp_ctx);

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Gerrit-Project: osmo-mgw
Gerrit-Branch: master
Gerrit-Change-Id: I35e415f67946b73c74408afe265618cfe4f72b0b
Gerrit-Change-Number: 24143
Gerrit-PatchSet: 3
Gerrit-Owner: neels <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-MessageType: merged
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