diff --git a/hw/rtl8139.c b/hw/rtl8139.c
index 1f4f585..f04dd54 100644
--- a/hw/rtl8139.c
+++ b/hw/rtl8139.c
@@ -1909,6 +1909,7 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
cpu_physical_memory_read(cplus_tx_ring_desc, (uint8_t *)&val, 4);
txdw0 = le32_to_cpu(val);
+ /* TODO: implement VLAN tagging support, VLAN tag data is read to txdw1 */
cpu_physical_memory_read(cplus_tx_ring_desc+4, (uint8_t *)&val, 4);
txdw1 = le32_to_cpu(val);
cpu_physical_memory_read(cplus_tx_ring_desc+8, (uint8_t *)&val, 4);
@@ -1920,6 +1921,9 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
descriptor,
txdw0, txdw1, txbufLO, txbufHI));
+ /* TODO: the following discard cast should clean clang analyzer output */
+ (void)txdw1;