ul_tbf: Simplify function rcv_data_block_acknowledged

Let's avoid different code paths in the loop based on is_tlli_invalid.
Instead, always do the proper storing of the block, and if later on the
corner case is found (no TLLI received while in Content Resolution
process) when checking tlli related stuff, then simply invalidate the
block.

Related: OS#1940
Change-Id: I77afaa617d7ce045c0f6d994fc0d8e03fe69de53

src/tbf_ul.cpp

@@ -420,7 +420,6 @@ int gprs_rlcmac_ul_tbf::rcv_data_block_acknowledged(
 		int num_chunks;
 		uint8_t *rlc_data;
 		rdbi = &rlc->block_info[block_idx];
-		bool need_rlc_data = false;
 
 		LOGPTBFUL(this, LOGL_DEBUG,
 			  "Got %s RLC data block: CV=%d, BSN=%d, SPB=%d, PI=%d, E=%d, TI=%d, bitoffs=%d\n",
@@ -435,23 +434,12 @@ int gprs_rlcmac_ul_tbf::rcv_data_block_acknowledged(
 			LOGPTBFUL(this, LOGL_DEBUG, "BSN %d out of window %d..%d (it's normal)\n",
 				  rdbi->bsn,
 				  m_window.v_q(), m_window.mod_sns(m_window.v_q() + ws - 1));
+			continue;
 		} else if (m_window.is_received(rdbi->bsn)) {
 			LOGPTBFUL(this, LOGL_DEBUG,
 				  "BSN %d already received\n", rdbi->bsn);
-		} else {
-			need_rlc_data = true;
-		}
-
-		if (!is_tlli_valid()) {
-			if (!rdbi->ti) {
-				LOGPTBFUL(this, LOGL_NOTICE, "Missing TLLI within UL DATA.\n");
-				continue;
-			}
-			need_rlc_data = true;
-		}
-
-		if (!need_rlc_data)
 			continue;
+		}
 
 		/* Store block and meta info to BSN buffer */
 
@@ -513,6 +501,10 @@ int gprs_rlcmac_ul_tbf::rcv_data_block_acknowledged(
 				m_window.invalidate_bsn(rdbi->bsn);
 				continue;
 			}
+		} else if (!is_tlli_valid()) {
+			LOGPTBFUL(this, LOGL_NOTICE, "Missing TLLI within UL DATA.\n");
+			m_window.invalidate_bsn(rdbi->bsn);
+			continue;
 		}
 
 		m_window.receive_bsn(rdbi->bsn);