} //if (byFBOption == AUTO_FB_NONE)
        } else if (byPktType == PK_TYPE_11A) {
                if ((byFBOption != AUTO_FB_NONE)) {
-                       // Auto Fallback
-                       PSTxDataHead_a_FB pBuf = (PSTxDataHead_a_FB)pTxDataHead;
+                       /* Auto Fallback */
+                       struct vnt_tx_datahead_a_fb *buf = pTxDataHead;
                        /* Get SignalField, ServiceField & Length */
                        vnt_get_phy_field(pDevice, cbFrameLength, wCurrentRate,
-                                         byPktType, &pBuf->a);
-
-                       //Get Duration and TimeStampOff
+                                         byPktType, &buf->a);
 
-                       pBuf->wDuration = cpu_to_le16((unsigned short)s_uGetDataDuration(pDevice, DATADUR_A, cbFrameLength, byPktType,
-                                                                                        wCurrentRate, bNeedAck, uFragIdx, cbLastFragmentSize, uMACfragNum, byFBOption)); //0: 5GHz
-                       pBuf->wDuration_f0 = cpu_to_le16((unsigned short)s_uGetDataDuration(pDevice, DATADUR_A_F0, cbFrameLength, byPktType,
-                                                                                           wCurrentRate, bNeedAck, uFragIdx, cbLastFragmentSize, uMACfragNum, byFBOption)); //0: 5GHz
-                       pBuf->wDuration_f1 = cpu_to_le16((unsigned short)s_uGetDataDuration(pDevice, DATADUR_A_F1, cbFrameLength, byPktType,
-                                                                                           wCurrentRate, bNeedAck, uFragIdx, cbLastFragmentSize, uMACfragNum, byFBOption)); //0: 5GHz
-                       pBuf->wTimeStampOff = vnt_time_stamp_off(pDevice, wCurrentRate);
-                       return pBuf->wDuration;
+                       /* Get Duration and TimeStampOff */
+                       buf->duration = cpu_to_le16((u16)s_uGetDataDuration(pDevice, DATADUR_A, cbFrameLength, byPktType,
+                                                                           wCurrentRate, bNeedAck, uFragIdx, cbLastFragmentSize, uMACfragNum, byFBOption));
+                       buf->duration_f0 = cpu_to_le16((u16)s_uGetDataDuration(pDevice, DATADUR_A_F0, cbFrameLength, byPktType,
+                                                                              wCurrentRate, bNeedAck, uFragIdx, cbLastFragmentSize, uMACfragNum, byFBOption));
+                       buf->duration_f1 = cpu_to_le16((u16)s_uGetDataDuration(pDevice, DATADUR_A_F1, cbFrameLength, byPktType,
+                                                                               wCurrentRate, bNeedAck, uFragIdx, cbLastFragmentSize, uMACfragNum, byFBOption));
+                       buf->time_stamp_off = vnt_time_stamp_off(pDevice, wCurrentRate);
+                       return buf->duration;
                } else {
                        struct vnt_tx_datahead_ab *buf = pTxDataHead;
                        /* Get SignalField, ServiceField & Length */
                                pMICHDR = (struct vnt_mic_hdr *) (pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_ab));
                                pvRTS = (PSRTS_a_FB) (pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_ab) + cbMICHDR);
                                pvCTS = NULL;
-                               pvTxDataHd = (PSTxDataHead_a_FB) (pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_ab) + cbMICHDR + sizeof(SRTS_a_FB));
-                               cbHeaderLength = wTxBufSize + sizeof(struct vnt_rrv_time_ab) + cbMICHDR + sizeof(SRTS_a_FB) + sizeof(STxDataHead_a_FB);
+                               pvTxDataHd = (void *)(pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_ab) + cbMICHDR + sizeof(SRTS_a_FB));
+                               cbHeaderLength = wTxBufSize + sizeof(struct vnt_rrv_time_ab) +
+                                       cbMICHDR + sizeof(SRTS_a_FB) + sizeof(struct vnt_tx_datahead_a_fb);
                        } else { //RTS_needless
                                pvRrvTime = (void *)(pbyTxBufferAddr + wTxBufSize);
                                pMICHDR = (struct vnt_mic_hdr *)(pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_ab));
                                pvRTS = NULL;
                                pvCTS = NULL;
-                               pvTxDataHd = (PSTxDataHead_a_FB) (pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_ab) + cbMICHDR);
-                               cbHeaderLength = wTxBufSize + sizeof(struct vnt_rrv_time_ab) + cbMICHDR + sizeof(STxDataHead_a_FB);
+                               pvTxDataHd = (void *)(pbyTxBufferAddr + wTxBufSize + sizeof(struct vnt_rrv_time_ab) + cbMICHDR);
+                               cbHeaderLength = wTxBufSize + sizeof(struct vnt_rrv_time_ab) +
+                                       cbMICHDR + sizeof(struct vnt_tx_datahead_a_fb);
                        }
                } // Auto Fall Back
        }