Do not perform assignment, if the new channel equals the current one

This can happen, if a TCH/H was requested, but because it is not available,
a TCH/F is allocated. If the old channel was TCH/F already, it makes no
sense to assign it.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/libbsc/bsc_api.c b/src/libbsc/bsc_api.c
index 75bb3e100..991c44dfa 100644
--- a/src/libbsc/bsc_api.c
+++ b/src/libbsc/bsc_api.c
@@ -210,6 +210,13 @@ static int handle_new_assignment(struct gsm_subscriber_connection *conn, int cha
 		return -1;
 	}
 
+	/* check if we are on TCH/F and requested TCH/H, but got TCH/F */
+	if (conn->lchan->type == new_lchan->type) {
+		lchan_free(new_lchan);
+		LOGP(DMSC, LOGL_NOTICE, "Not assign to equal channel rate.\n");
+		return -1;
+	}
+
 	/* copy old data to the new channel */
 	memcpy(&new_lchan->encr, &conn->lchan->encr, sizeof(new_lchan->encr));
 	new_lchan->ms_power = conn->lchan->ms_power;