tbf_ul: Avoid processing rx UL blocks for UL TBFs in RELEASING state

Change-Id: I1da9b665b9ed83a644ea798008d456d6298b7460
---
M src/tbf_ul.cpp
1 file changed, 22 insertions(+), 0 deletions(-)

diff --git a/src/tbf_ul.cpp b/src/tbf_ul.cpp
index 9a139ba..5ae0d49 100644
--- a/src/tbf_ul.cpp
+++ b/src/tbf_ul.cpp
@@ -258,6 +258,19 @@
 		"V(R)=%d)\n", rlc->tfi, this->m_window.v_q(),
 		this->m_window.v_r());
 
+	if (tbf_state(this) == TBF_ST_RELEASING) {
+		/* This may happen if MAX_N3101 is hit previously, moving the UL
+		 * TBF to RELEASING state. Since we have an fn-advance where DL
+		 * blocks are scheduled in advance, we may have requested USF for
+		 * this UL TBF before triggering and hence we are now receiving a
+		 * UL block from it. If this is the case, simply ignore the block.
+		 */
+		LOGPTBFUL(this, LOGL_INFO,
+			  "UL DATA TFI=%d received (V(Q)=%d .. V(R)=%d) while in RELEASING state, discarding\n",
+			  rlc->tfi, this->m_window.v_q(), this->m_window.v_r());
+		return 0;
+	}
+
 	/* process RSSI */
 	gprs_rlcmac_rssi(this, rssi);
 

