}
 }
 
+static __le16 vnt_time_stamp_off(struct vnt_private *priv, u16 rate)
+{
+       return cpu_to_le16(wTimeStampOff[priv->byPreambleType % 2]
+                                                       [rate % MAX_RATE]);
+}
+
 /*byPktType : PK_TYPE_11A     0
   PK_TYPE_11B     1
   PK_TYPE_11GB    2
                                                                                           bNeedAck, uFragIdx, cbLastFragmentSize,
                                                                                           uMACfragNum, byFBOption)); //1: 2.4
 
-                       pBuf->wTimeStampOff_a = cpu_to_le16(wTimeStampOff[pDevice->byPreambleType%2][wCurrentRate%MAX_RATE]);
-                       pBuf->wTimeStampOff_b = cpu_to_le16(wTimeStampOff[pDevice->byPreambleType%2][pDevice->byTopCCKBasicRate%MAX_RATE]);
+                       pBuf->wTimeStampOff_a = vnt_time_stamp_off(pDevice, wCurrentRate);
+                       pBuf->wTimeStampOff_b = vnt_time_stamp_off(pDevice, pDevice->byTopCCKBasicRate);
 
                        return pBuf->wDuration_a;
                } else {
                        pBuf->wDuration_a_f1 = cpu_to_le16((unsigned short)s_uGetDataDuration(pDevice, DATADUR_A_F1, cbFrameLength, byPktType,
                                                                                              wCurrentRate, bNeedAck, uFragIdx, cbLastFragmentSize, uMACfragNum, byFBOption)); //1: 2.4GHz
 
-                       pBuf->wTimeStampOff_a = cpu_to_le16(wTimeStampOff[pDevice->byPreambleType%2][wCurrentRate%MAX_RATE]);
-                       pBuf->wTimeStampOff_b = cpu_to_le16(wTimeStampOff[pDevice->byPreambleType%2][pDevice->byTopCCKBasicRate%MAX_RATE]);
+                       pBuf->wTimeStampOff_a = vnt_time_stamp_off(pDevice, wCurrentRate);
+                       pBuf->wTimeStampOff_b = vnt_time_stamp_off(pDevice, pDevice->byTopCCKBasicRate);
 
                        return pBuf->wDuration_a;
                } //if (byFBOption == AUTO_FB_NONE)
                                                                                            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 = cpu_to_le16(wTimeStampOff[pDevice->byPreambleType%2][wCurrentRate%MAX_RATE]);
+                       pBuf->wTimeStampOff = vnt_time_stamp_off(pDevice, wCurrentRate);
                        return pBuf->wDuration;
                } else {
                        PSTxDataHead_ab pBuf = (PSTxDataHead_ab)pTxDataHead;
                                                                                         cbLastFragmentSize, uMACfragNum,
                                                                                         byFBOption));
 
-                       pBuf->wTimeStampOff = cpu_to_le16(wTimeStampOff[pDevice->byPreambleType%2][wCurrentRate%MAX_RATE]);
+                       pBuf->wTimeStampOff = vnt_time_stamp_off(pDevice, wCurrentRate);
                        return pBuf->wDuration;
                }
        } else {
                                                                                 wCurrentRate, bNeedAck, uFragIdx,
                                                                                 cbLastFragmentSize, uMACfragNum,
                                                                                 byFBOption));
-               pBuf->wTimeStampOff = cpu_to_le16(wTimeStampOff[pDevice->byPreambleType%2][wCurrentRate%MAX_RATE]);
+               pBuf->wTimeStampOff = vnt_time_stamp_off(pDevice, wCurrentRate);
                return pBuf->wDuration;
        }
        return 0;
                          wCurrentRate, byPktType, &short_head->ab);
 
        /* Get TimeStampOff */
-       short_head->time_stamp_off = cpu_to_le16(wTimeStampOff[pDevice->byPreambleType%2][wCurrentRate%MAX_RATE]);
+       short_head->time_stamp_off = vnt_time_stamp_off(pDevice, wCurrentRate);
        cbHeaderSize = sizeof(struct vnt_tx_short_buf_head);
 
        //Generate Beacon Header