Avoid using UL TBF in RELEASE state to assign DL TBF over PACCH

In RELEASE state, the UL TBF is considered not available anymore, and we
are simply waiting in order to be able to reuse the allocated resources
(just in case it was still around). Hence, a UL TBF in that state should
not be selectable to initiate a DL TBF assignment over PACCH.

Related: OS#5472
Change-Id: Ia11f7802779cfeea15a71bddad9f7e0c6c1afb11
---
M src/gprs_ms.c
1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/gprs_ms.c b/src/gprs_ms.c
index dda2f29..06d012c 100644
--- a/src/gprs_ms.c
+++ b/src/gprs_ms.c
@@ -1106,7 +1106,8 @@
 	if (!ul_tbf)
 		return true;
 	if (ul_tbf_contention_resolution_done(ul_tbf) &&
-	    !tbf_ul_ack_waiting_cnf_final_ack(ul_tbf))
+	    !tbf_ul_ack_waiting_cnf_final_ack(ul_tbf) &&
+	    tbf_state(ul_tbf_as_tbf(ul_tbf)) != TBF_ST_RELEASING)
 		return true;
 
 	return false;

