fixeria has uploaded this change for review.

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silent_call: check if subscriber has a connection

It makes no sense to initiate a silent call if subscriber already
has an active connection (e.g. when a normal call is ongoing).

Change-Id: I52b3be26c61cadacc4783b5c324809ecd6906b36
---
M src/libmsc/msc_vty.c
M src/libmsc/silent_call.c
2 files changed, 6 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-msc refs/changes/77/40877/1

diff --git a/src/libmsc/msc_vty.c b/src/libmsc/msc_vty.c
index 41cb0d4..07791f1 100644
--- a/src/libmsc/msc_vty.c
+++ b/src/libmsc/msc_vty.c
@@ -1596,6 +1596,9 @@
 	case -ENODEV:
 		vty_out(vty, "%% Subscriber not attached%s", VTY_NEWLINE);
 		break;
+	case -EBUSY:
+		vty_out(vty, "%% Subscriber has an active connection%s", VTY_NEWLINE);
+		break;
 	default:
 		if (rc)
 			vty_out(vty, "%% Cannot start silent call (rc=%d)%s", rc, VTY_NEWLINE);
diff --git a/src/libmsc/silent_call.c b/src/libmsc/silent_call.c
index 9c0d2b6..327ed7f 100644
--- a/src/libmsc/silent_call.c
+++ b/src/libmsc/silent_call.c
@@ -142,6 +142,9 @@
 	struct gsm_network *net = vsub->vlr->user_ctx;
 	struct gsm_trans *trans;
 
+	if (msc_a_for_vsub(vsub, true) != NULL)
+		return -EBUSY;
+
 	trans = trans_alloc(net, vsub, TRANS_SILENT_CALL, 0, 0);
 	if (trans == NULL)
 		return -ENODEV;

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