if (byPktType == PK_TYPE_11GB || byPktType == PK_TYPE_11GA) {
                if (byFBOption == AUTO_FB_NONE) {
-                       PSTxDataHead_g pBuf = (PSTxDataHead_g)pTxDataHead;
+                       struct vnt_tx_datahead_g *buf = pTxDataHead;
                        /* Get SignalField, ServiceField & Length */
                        vnt_get_phy_field(pDevice, cbFrameLength, wCurrentRate,
-                                         byPktType, &pBuf->a);
+                                         byPktType, &buf->a);
 
                        vnt_get_phy_field(pDevice, cbFrameLength,
                                          pDevice->byTopCCKBasicRate,
-                                         PK_TYPE_11B, &pBuf->b);
-
-                       //Get Duration and TimeStamp
-                       pBuf->wDuration_a = cpu_to_le16((unsigned short)s_uGetDataDuration(pDevice, DATADUR_A, cbFrameLength,
-                                                                                          byPktType, wCurrentRate, bNeedAck, uFragIdx,
-                                                                                          cbLastFragmentSize, uMACfragNum,
-                                                                                          byFBOption)); //1: 2.4GHz
-                       pBuf->wDuration_b = cpu_to_le16((unsigned short)s_uGetDataDuration(pDevice, DATADUR_B, cbFrameLength,
-                                                                                          PK_TYPE_11B, pDevice->byTopCCKBasicRate,
-                                                                                          bNeedAck, uFragIdx, cbLastFragmentSize,
-                                                                                          uMACfragNum, byFBOption)); //1: 2.4
-
-                       pBuf->wTimeStampOff_a = vnt_time_stamp_off(pDevice, wCurrentRate);
-                       pBuf->wTimeStampOff_b = vnt_time_stamp_off(pDevice, pDevice->byTopCCKBasicRate);
-
-                       return pBuf->wDuration_a;
+                                         PK_TYPE_11B, &buf->b);
+
+                       /* Get Duration and TimeStamp */
+                       buf->duration_a = cpu_to_le16((u16)s_uGetDataDuration(pDevice, DATADUR_A, cbFrameLength,
+                                                                             byPktType, wCurrentRate, bNeedAck, uFragIdx,
+                                                                             cbLastFragmentSize, uMACfragNum,
+                                                                             byFBOption));
+                       buf->duration_b = cpu_to_le16((u16)s_uGetDataDuration(pDevice, DATADUR_B, cbFrameLength,
+                                                                             PK_TYPE_11B, pDevice->byTopCCKBasicRate,
+                                                                             bNeedAck, uFragIdx, cbLastFragmentSize,
+                                                                             uMACfragNum, byFBOption));
+
+                       buf->time_stamp_off_a = vnt_time_stamp_off(pDevice, wCurrentRate);
+                       buf->time_stamp_off_b = vnt_time_stamp_off(pDevice, pDevice->byTopCCKBasicRate);
+
+                       return buf->duration_a;
                } else {
                        // Auto Fallback
                        PSTxDataHead_g_FB pBuf = (PSTxDataHead_g_FB)pTxDataHead;
                                pMICHDR = (struct vnt_mic_hdr *)(pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_rts));
                                pvRTS = (PSRTS_g)(pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_rts) + cbMICHDR);
                                pvCTS = NULL;
-                               pvTxDataHd = (PSTxDataHead_g)(pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_rts) + cbMICHDR + sizeof(SRTS_g));
-                               cbHeaderLength = wTxBufSize + sizeof(struct vnt_rrv_time_rts) + cbMICHDR + sizeof(SRTS_g) + sizeof(STxDataHead_g);
+                               pvTxDataHd = (void *)(pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_rts) + cbMICHDR + sizeof(SRTS_g));
+                               cbHeaderLength = wTxBufSize + sizeof(struct vnt_rrv_time_rts) +
+                                                       cbMICHDR + sizeof(SRTS_g) + sizeof(struct vnt_tx_datahead_g);
                        } else { //RTS_needless
                                pvRrvTime = (void *)(pbyTxBufferAddr + wTxBufSize);
                                pMICHDR = (struct vnt_mic_hdr *) (pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_cts));
                                pvRTS = NULL;
                                pvCTS = (PSCTS) (pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_cts) + cbMICHDR);
-                               pvTxDataHd = (PSTxDataHead_g) (pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_cts) + cbMICHDR + sizeof(SCTS));
-                               cbHeaderLength = wTxBufSize + sizeof(struct vnt_rrv_time_cts) + cbMICHDR + sizeof(SCTS) + sizeof(STxDataHead_g);
+                               pvTxDataHd = (void *)(pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_cts) + cbMICHDR + sizeof(SCTS));
+                               cbHeaderLength = wTxBufSize + sizeof(struct vnt_rrv_time_cts) +
+                                                       cbMICHDR + sizeof(SCTS) + sizeof(struct vnt_tx_datahead_g);
                        }
                } else {
                        // Auto Fall Back
                pvRTS = NULL;
                pCTS = (PSCTS) (pbyTxBufferAddr + wTxBufSize +
                                        sizeof(struct vnt_rrv_time_cts));
-               pvTxDataHd = (PSTxDataHead_g) (pbyTxBufferAddr + wTxBufSize +
+               pvTxDataHd = (void *)(pbyTxBufferAddr + wTxBufSize +
                                sizeof(struct vnt_rrv_time_cts) + sizeof(SCTS));
                cbHeaderSize = wTxBufSize + sizeof(struct vnt_rrv_time_cts) +
-                                       sizeof(SCTS) + sizeof(STxDataHead_g);
+                                       sizeof(SCTS) + sizeof(struct vnt_tx_datahead_g);
        } else { // 802.11a/b packet
                pvRrvTime = (void *)(pbyTxBufferAddr + wTxBufSize);
                pMICHDR = NULL;
                // in the same place of other packet's Duration-field).
                // And it will cause Cisco-AP to issue Disassociation-packet
                if (byPktType == PK_TYPE_11GB || byPktType == PK_TYPE_11GA) {
-                       ((PSTxDataHead_g)pvTxDataHd)->wDuration_a = cpu_to_le16(pPacket->p80211Header->sA2.wDurationID);
-                       ((PSTxDataHead_g)pvTxDataHd)->wDuration_b = cpu_to_le16(pPacket->p80211Header->sA2.wDurationID);
+                       ((struct vnt_tx_datahead_g *)pvTxDataHd)->duration_a = cpu_to_le16(pPacket->p80211Header->sA2.wDurationID);
+                       ((struct vnt_tx_datahead_g *)pvTxDataHd)->duration_b = cpu_to_le16(pPacket->p80211Header->sA2.wDurationID);
                } else {
                        ((PSTxDataHead_ab)pvTxDataHd)->wDuration = cpu_to_le16(pPacket->p80211Header->sA2.wDurationID);
                }
                pvRTS = NULL;
                pvCTS = (PSCTS) (pbyTxBufferAddr + wTxBufSize +
                                sizeof(struct vnt_rrv_time_cts) + cbMICHDR);
-               pvTxDataHd = (PSTxDataHead_g) (pbyTxBufferAddr + wTxBufSize +
+               pvTxDataHd = (void *)(pbyTxBufferAddr + wTxBufSize +
                        sizeof(struct vnt_rrv_time_cts) + cbMICHDR + sizeof(SCTS));
                cbHeaderSize = wTxBufSize + sizeof(struct vnt_rrv_time_cts) +
-                               cbMICHDR + sizeof(SCTS) + sizeof(STxDataHead_g);
+                               cbMICHDR + sizeof(SCTS) + sizeof(struct vnt_tx_datahead_g);
 
        } else {//802.11a/b packet
 
                // in the same place of other packet's Duration-field).
                // And it will cause Cisco-AP to issue Disassociation-packet
                if (byPktType == PK_TYPE_11GB || byPktType == PK_TYPE_11GA) {
-                       ((PSTxDataHead_g)pvTxDataHd)->wDuration_a = cpu_to_le16(p80211Header->sA2.wDurationID);
-                       ((PSTxDataHead_g)pvTxDataHd)->wDuration_b = cpu_to_le16(p80211Header->sA2.wDurationID);
+                       ((struct vnt_tx_datahead_g *)pvTxDataHd)->duration_a = cpu_to_le16(p80211Header->sA2.wDurationID);
+                       ((struct vnt_tx_datahead_g *)pvTxDataHd)->duration_b = cpu_to_le16(p80211Header->sA2.wDurationID);
                } else {
                        ((PSTxDataHead_ab)pvTxDataHd)->wDuration = cpu_to_le16(p80211Header->sA2.wDurationID);
                }