diff --git a/hal/rtl8188eu_xmit.c b/hal/rtl8188eu_xmit.c
index 45f83c4..66c322e 100755
--- a/hal/rtl8188eu_xmit.c
+++ b/hal/rtl8188eu_xmit.c
@@ -216,29 +216,21 @@ static s32 update_txdesc(struct xmit_frame *pxmitframe, u8 *pmem, s32 sz ,u8 bag
 	struct mlme_ext_priv	*pmlmeext = &padapter->mlmeextpriv;
 	struct mlme_ext_info	*pmlmeinfo = &(pmlmeext->mlmext_info);
 	sint	bmcst = IS_MCAST(pattrib->ra);
-
 #ifdef CONFIG_P2P
 	struct wifidirect_info*	pwdinfo = &padapter->wdinfo;
 #endif /* CONFIG_P2P */
 
-#ifndef CONFIG_USE_USB_BUFFER_ALLOC_TX
-if (padapter->registrypriv.mp_mode == 0)
-{
-	if((!bagg_pkt) &&(urb_zero_packet_chk(padapter, sz)==0))/* sz %512) != 0 */
-	/* if((!bagg_pkt) &&(rtw_usb_bulk_size_boundary(padapter,TXDESC_SIZE+sz)==false)) */
-	{
-		ptxdesc = (struct tx_desc *)(pmem+PACKET_OFFSET_SZ);
-		/* DBG_8192C("==> non-agg-pkt,shift pointer...\n"); */
-		pull = 1;
+	if (padapter->registrypriv.mp_mode == 0) {
+		if((!bagg_pkt) &&(urb_zero_packet_chk(padapter, sz)==0)) {
+			ptxdesc = (struct tx_desc *)(pmem+PACKET_OFFSET_SZ);
+			pull = 1;
+		}
 	}
-}
-#endif	/*  CONFIG_USE_USB_BUFFER_ALLOC_TX */
 
 	memset(ptxdesc, 0, sizeof(struct tx_desc));
 
         /* 4 offset 0 */
 	ptxdesc->txdw0 |= cpu_to_le32(OWN | FSG | LSG);
-	/* DBG_8192C("%s==> pkt_len=%d,bagg_pkt=%02x\n",__FUNCTION__,sz,bagg_pkt); */
 	ptxdesc->txdw0 |= cpu_to_le32(sz & 0x0000ffff);/* update TXPKTSIZE */
 
 	offset = TXDESC_SIZE + OFFSET_SZ;
@@ -247,16 +239,12 @@ if (padapter->registrypriv.mp_mode == 0)
 
 	if (bmcst) ptxdesc->txdw0 |= cpu_to_le32(BMC);
 
-#ifndef CONFIG_USE_USB_BUFFER_ALLOC_TX
-	if (padapter->registrypriv.mp_mode == 0)
-	{
-		if(!bagg_pkt){
-			if((pull) && (pxmitframe->pkt_offset>0)) {
+	if (padapter->registrypriv.mp_mode == 0) {
+		if(!bagg_pkt) {
+			if((pull) && (pxmitframe->pkt_offset>0))
 				pxmitframe->pkt_offset = pxmitframe->pkt_offset -1;
-			}
 		}
 	}
-#endif
 	/*  pkt_offset, unit:8 bytes padding */
 	if (pxmitframe->pkt_offset > 0)
 		ptxdesc->txdw1 |= cpu_to_le32((pxmitframe->pkt_offset << 26) & 0x7c000000);
@@ -789,7 +777,6 @@ s32 rtl8188eu_xmitframe_complete(struct adapter *padapter, struct xmit_priv *pxm
 	{
 		rtw_issue_addbareq_cmd(padapter, pfirstframe);
 	}
-#ifndef CONFIG_USE_USB_BUFFER_ALLOC_TX
 	/* 3 3. update first frame txdesc */
 	if ((pbuf_tail % bulkSize) == 0) {
 		/*  remove pkt_offset */
@@ -797,7 +784,6 @@ s32 rtl8188eu_xmitframe_complete(struct adapter *padapter, struct xmit_priv *pxm
 		pfirstframe->buf_addr += PACKET_OFFSET_SZ;
 		pfirstframe->pkt_offset--;
 	}
-#endif	/*  CONFIG_USE_USB_BUFFER_ALLOC_TX */
 
 	update_txdesc(pfirstframe, pfirstframe->buf_addr, pfirstframe->attrib.last_txcmdsz,true);
 
diff --git a/os_dep/usb_ops_linux.c b/os_dep/usb_ops_linux.c
index 39564a4..f0120d2 100755
--- a/os_dep/usb_ops_linux.c
+++ b/os_dep/usb_ops_linux.c
@@ -531,13 +531,6 @@ u32 usb_write_port(struct intf_hdl *pintfhdl, u32 addr, u32 cnt, u8 *wmem)
 				cnt,
 				usb_write_port_complete,
 				pxmitbuf);/* context is pxmitbuf */
-
-#ifdef CONFIG_USE_USB_BUFFER_ALLOC_TX
-	purb->transfer_dma = pxmitbuf->dma_transfer_addr;
-	purb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
-	purb->transfer_flags |= URB_ZERO_PACKET;
-#endif	/*  CONFIG_USE_USB_BUFFER_ALLOC_TX */
-
 	status = usb_submit_urb(purb, GFP_ATOMIC);
 	if (!status) {
 		HAL_DATA_TYPE	*pHalData = GET_HAL_DATA(padapter);
diff --git a/os_dep/xmit_linux.c b/os_dep/xmit_linux.c
index f53f2f4..553704c 100755
--- a/os_dep/xmit_linux.c
+++ b/os_dep/xmit_linux.c
@@ -78,13 +78,6 @@ int rtw_os_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *pxmitb
 	struct dvobj_priv	*pdvobjpriv = adapter_to_dvobj(padapter);
 	struct usb_device	*pusbd = pdvobjpriv->pusbdev;
 
-#ifdef CONFIG_USE_USB_BUFFER_ALLOC_TX
-	pxmitbuf->pallocated_buf = rtw_usb_buffer_alloc(pusbd, (size_t)alloc_sz, &pxmitbuf->dma_transfer_addr);
-	pxmitbuf->pbuf = pxmitbuf->pallocated_buf;
-	if(pxmitbuf->pallocated_buf == NULL)
-		return _FAIL;
-#else /*  CONFIG_USE_USB_BUFFER_ALLOC_TX */
-
 	pxmitbuf->pallocated_buf = rtw_zmalloc(alloc_sz);
 	if (pxmitbuf->pallocated_buf == NULL)
 	{
@@ -94,13 +87,9 @@ int rtw_os_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *pxmitb
 	pxmitbuf->pbuf = (u8 *)N_BYTE_ALIGMENT((SIZE_PTR)(pxmitbuf->pallocated_buf), XMITBUF_ALIGN_SZ);
 	pxmitbuf->dma_transfer_addr = 0;
 
-#endif /*  CONFIG_USE_USB_BUFFER_ALLOC_TX */
-
-	for(i=0; i<8; i++)
-	{
+	for(i=0; i<8; i++) {
 		pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
-		if(pxmitbuf->pxmit_urb[i] == NULL)
-		{
+		if(pxmitbuf->pxmit_urb[i] == NULL) {
 			DBG_871X("pxmitbuf->pxmit_urb[i]==NULL");
 			return _FAIL;
 		}
@@ -125,14 +114,8 @@ void rtw_os_xmit_resource_free(struct adapter *padapter, struct xmit_buf *pxmitb
 		}
 	}
 
-#ifdef CONFIG_USE_USB_BUFFER_ALLOC_TX
-	rtw_usb_buffer_free(pusbd, (size_t)free_sz, pxmitbuf->pallocated_buf, pxmitbuf->dma_transfer_addr);
-	pxmitbuf->pallocated_buf =  NULL;
-	pxmitbuf->dma_transfer_addr = 0;
-#else	/*  CONFIG_USE_USB_BUFFER_ALLOC_TX */
 	if(pxmitbuf->pallocated_buf)
 		rtw_mfree(pxmitbuf->pallocated_buf, free_sz);
-#endif	/*  CONFIG_USE_USB_BUFFER_ALLOC_TX */
 }
 
 #define WMM_XMIT_THRESHOLD	(NR_XMITFRAME*2/5)