diff --git a/core/rtw_ap.c b/core/rtw_ap.c
index 01fecc8..3d6dbfd 100644
--- a/core/rtw_ap.c
+++ b/core/rtw_ap.c
@@ -2939,7 +2939,7 @@ u8 rtw_ap_bmc_frames_hdl(_adapter *padapter)
 	rtw_hal_get_hwreg(padapter, HW_VAR_CHK_HI_QUEUE_EMPTY, &empty);
 
 	while (_FALSE == empty && rtw_get_passing_time_ms(start) < 3000) {
-		rtw_msleep_os(100);
+		msleep(100);
 		rtw_hal_get_hwreg(padapter, HW_VAR_CHK_HI_QUEUE_EMPTY, &empty);
 	}
 
diff --git a/core/rtw_cmd.c b/core/rtw_cmd.c
index aa96e87..3073725 100644
--- a/core/rtw_cmd.c
+++ b/core/rtw_cmd.c
@@ -205,7 +205,7 @@ void _rtw_free_evt_priv(struct	evt_priv *pevtpriv)
 #ifdef CONFIG_C2H_WK
 	_cancel_workitem_sync(&pevtpriv->c2h_wk);
 	while (pevtpriv->c2h_wk_alive)
-		rtw_msleep_os(10);
+		msleep(10);
 
 	while (!rtw_cbuf_empty(pevtpriv->c2h_queue)) {
 		void *c2h;
@@ -4147,7 +4147,7 @@ static void rtw_chk_hi_queue_hdl(_adapter *padapter)
 	rtw_hal_get_hwreg(padapter, HW_VAR_CHK_HI_QUEUE_EMPTY, &empty);
 
 	while (_FALSE == empty && rtw_get_passing_time_ms(start) < rtw_get_wait_hiq_empty_ms()) {
-		rtw_msleep_os(100);
+		msleep(100);
 		rtw_hal_get_hwreg(padapter, HW_VAR_CHK_HI_QUEUE_EMPTY, &empty);
 	}
 
diff --git a/core/rtw_mlme.c b/core/rtw_mlme.c
index 5262391..f3c9b48 100644
--- a/core/rtw_mlme.c
+++ b/core/rtw_mlme.c
@@ -1888,7 +1888,7 @@ static u32 _rtw_wait_scan_done(_adapter *adapter, u8 abort, u32 timeout_ms)
 			break;
 
 		RTW_INFO(FUNC_NDEV_FMT"fw_state=_FW_UNDER_SURVEY!\n", FUNC_NDEV_ARG(adapter->pnetdev));
-		rtw_msleep_os(20);
+		msleep(20);
 	}
 
 	if (_TRUE == abort) {
@@ -1962,7 +1962,7 @@ static u32 _rtw_wait_join_done(_adapter *adapter, u8 abort, u32 timeout_ms)
 			break;
 
 		RTW_INFO(FUNC_ADPT_FMT" linking...\n", FUNC_ADPT_ARG(adapter));
-		rtw_msleep_os(20);
+		msleep(20);
 	}
 
 	if (abort) {
diff --git a/core/rtw_mlme_ext.c b/core/rtw_mlme_ext.c
index 98f94dd..abd9796 100644
--- a/core/rtw_mlme_ext.c
+++ b/core/rtw_mlme_ext.c
@@ -616,7 +616,7 @@ u32 rtw_force_stop_cac(struct rf_ctl_t *rfctl, u32 timeout_ms)
 	) {
 		if (dev_is_surprise_removed(dvobj) || dev_is_drv_stopped(dvobj))
 			break;
-		rtw_msleep_os(20);
+		msleep(20);
 	}
 
 	if (IS_UNDER_CAC(rfctl)) {
@@ -6125,7 +6125,7 @@ int issue_probereq_p2p_ex(_adapter *adapter, u8 *da, int try_cnt, int wait_ms)
 			break;
 
 		if (i < try_cnt && wait_ms > 0 && ret == _FAIL)
-			rtw_msleep_os(wait_ms);
+			msleep(wait_ms);
 
 	} while ((i < try_cnt) && ((ret == _FAIL) || (wait_ms == 0)));
 
@@ -7729,7 +7729,7 @@ s32 dump_mgntframe_and_wait_ack_timeout(_adapter *padapter, struct xmit_frame *p
 	return ret;
 #else /* !CONFIG_XMIT_ACK */
 	dump_mgntframe(padapter, pmgntframe);
-	rtw_msleep_os(50);
+	msleep(50);
 	return _SUCCESS;
 #endif /* !CONFIG_XMIT_ACK */
 }
@@ -8547,7 +8547,7 @@ int issue_probereq_ex(_adapter *padapter, const NDIS_802_11_SSID *pssid, const u
 			break;
 
 		if (i < try_cnt && wait_ms > 0 && ret == _FAIL)
-			rtw_msleep_os(wait_ms);
+			msleep(wait_ms);
 
 	} while ((i < try_cnt) && ((ret == _FAIL) || (wait_ms == 0)));
 
@@ -9557,7 +9557,7 @@ int issue_nulldata(_adapter *padapter, unsigned char *da, unsigned int power_mod
 			break;
 
 		if (i < try_cnt && wait_ms > 0 && ret == _FAIL)
-			rtw_msleep_os(wait_ms);
+			msleep(wait_ms);
 
 	} while ((i < try_cnt) && ((ret == _FAIL) || (wait_ms == 0)));
 
@@ -9711,7 +9711,7 @@ int issue_qos_nulldata(_adapter *padapter, unsigned char *da, u16 tid, u8 ps, in
 			break;
 
 		if (i < try_cnt && wait_ms > 0 && ret == _FAIL)
-			rtw_msleep_os(wait_ms);
+			msleep(wait_ms);
 
 	} while ((i < try_cnt) && ((ret == _FAIL) || (wait_ms == 0)));
 
@@ -9846,7 +9846,7 @@ int issue_deauth_ex(_adapter *padapter, u8 *da, unsigned short reason, int try_c
 			break;
 
 		if (i < try_cnt && wait_ms > 0 && ret == _FAIL)
-			rtw_msleep_os(wait_ms);
+			msleep(wait_ms);
 
 	} while ((i < try_cnt) && ((ret == _FAIL) || (wait_ms == 0)));
 
@@ -10268,7 +10268,7 @@ inline u8 issue_addba_rsp_wait_ack(_adapter *adapter, unsigned char *ra, u8 tid,
 			break;
 
 		if (i < try_cnt && wait_ms > 0 && ret == _FAIL)
-			rtw_msleep_os(wait_ms);
+			msleep(wait_ms);
 
 	} while ((i < try_cnt) && ((ret == _FAIL) || (wait_ms == 0)));
 
@@ -10346,7 +10346,7 @@ int issue_del_ba_ex(_adapter *adapter, unsigned char *ra, u8 tid, u16 reason, u8
 			break;
 
 		if (i < try_cnt && wait_ms > 0 && ret == _FAIL)
-			rtw_msleep_os(wait_ms);
+			msleep(wait_ms);
 
 	} while ((i < try_cnt) && ((ret == _FAIL) || (wait_ms == 0)));
 
@@ -10621,7 +10621,7 @@ int issue_action_SM_PS_wait_ack(_adapter *padapter, unsigned char *raddr, u8 New
 			break;
 
 		if (i < try_cnt && wait_ms > 0 && ret == _FAIL)
-			rtw_msleep_os(wait_ms);
+			msleep(wait_ms);
 
 	} while ((i < try_cnt) && ((ret == _FAIL) || (wait_ms == 0)));
 
@@ -10836,7 +10836,7 @@ unsigned int send_beacon(_adapter *padapter)
 			issue++;
 			do {
 				#if defined(CONFIG_PCI_BCN_POLLING)
-				rtw_msleep_os(1);
+				msleep(1);
 				#else
 				yield();
 				#endif
@@ -15880,7 +15880,7 @@ u8 chk_bmc_sleepq_hdl(_adapter *padapter, unsigned char *pbuf)
 
 	if ((rtw_tim_map_is_set(padapter, pstapriv->tim_bitmap, 0)) && (psta_bmc->sleepq_len > 0)) {
 #ifndef CONFIG_PCI_HCI
-		rtw_msleep_os(10);/* 10ms, ATIM(HIQ) Windows */
+		msleep(10);/* 10ms, ATIM(HIQ) Windows */
 #endif
 		/* _enter_critical_bh(&psta_bmc->sleep_q.lock, &irqL); */
 		_enter_critical_bh(&pxmitpriv->lock, &irqL);
diff --git a/core/rtw_mp.c b/core/rtw_mp.c
index 7a95e64..240508a 100644
--- a/core/rtw_mp.c
+++ b/core/rtw_mp.c
@@ -2455,7 +2455,7 @@ u32 mp_query_psd(PADAPTER pAdapter, u8 *data)
 	}
 
 #ifdef CONFIG_LONG_DELAY_ISSUE
-	rtw_msleep_os(100);
+	msleep(100);
 #else
 	rtw_mdelay_os(100);
 #endif
diff --git a/core/rtw_mp_ioctl.c b/core/rtw_mp_ioctl.c
index 035d281..b956dba 100644
--- a/core/rtw_mp_ioctl.c
+++ b/core/rtw_mp_ioctl.c
@@ -628,7 +628,7 @@ NDIS_STATUS oid_rt_pro_set_continuous_tx_hdl(struct oid_par_priv *poid_par_priv)
 		if (pmp_priv->tx.stop == 0) {
 			pmp_priv->tx.stop = 1;
 			RTW_INFO("%s: pkt tx is running...\n", __func__);
-			rtw_msleep_os(5);
+			msleep(5);
 		}
 		pmp_priv->tx.stop = 0;
 		pmp_priv->tx.count = 1;
@@ -663,7 +663,7 @@ NDIS_STATUS oid_rt_pro_set_single_carrier_tx_hdl(struct oid_par_priv *poid_par_p
 		if (pmp_priv->tx.stop == 0) {
 			pmp_priv->tx.stop = 1;
 			RTW_INFO("%s: pkt tx is running...\n", __func__);
-			rtw_msleep_os(5);
+			msleep(5);
 		}
 		pmp_priv->tx.stop = 0;
 		pmp_priv->tx.count = 1;
@@ -698,7 +698,7 @@ NDIS_STATUS oid_rt_pro_set_carrier_suppression_tx_hdl(struct oid_par_priv *poid_
 		if (pmp_priv->tx.stop == 0) {
 			pmp_priv->tx.stop = 1;
 			RTW_INFO("%s: pkt tx is running...\n", __func__);
-			rtw_msleep_os(5);
+			msleep(5);
 		}
 		pmp_priv->tx.stop = 0;
 		pmp_priv->tx.count = 1;
diff --git a/core/rtw_pwrctrl.c b/core/rtw_pwrctrl.c
index 24fe550..431b8fb 100644
--- a/core/rtw_pwrctrl.c
+++ b/core/rtw_pwrctrl.c
@@ -540,7 +540,7 @@ u8 rtw_cpwm_polling(_adapter *adapter, u8 rpwm, u8 cpwm_orig)
 	do {
 		start_time = rtw_get_current_time();
 		do {
-			rtw_msleep_os(1);
+			msleep(1);
 			rtw_hal_get_hwreg(adapter, HW_VAR_CPWM, &cpwm_now);
 
 			if ((cpwm_orig ^ cpwm_now) & 0x80) {
@@ -1458,7 +1458,7 @@ void LPS_Leave_check(
 			RTW_ERR("Wait for cpwm event  than 100 ms!!!\n");
 			break;
 		}
-		rtw_msleep_os(1);
+		msleep(1);
 	}
 
 }
@@ -2512,7 +2512,7 @@ int _rtw_pwr_wakeup(_adapter *padapter, u32 ips_deffer_ms, const char *caller)
 	if (pwrpriv->ps_processing) {
 		RTW_INFO("%s wait ps_processing...\n", __func__);
 		while (pwrpriv->ps_processing && rtw_get_passing_time_ms(start) <= 3000)
-			rtw_msleep_os(10);
+			msleep(10);
 		if (pwrpriv->ps_processing)
 			RTW_INFO("%s wait ps_processing timeout\n", __func__);
 		else
@@ -2523,7 +2523,7 @@ int _rtw_pwr_wakeup(_adapter *padapter, u32 ips_deffer_ms, const char *caller)
 	if (rtw_hal_sreset_inprogress(padapter)) {
 		RTW_INFO("%s wait sreset_inprogress...\n", __func__);
 		while (rtw_hal_sreset_inprogress(padapter) && rtw_get_passing_time_ms(start) <= 4000)
-			rtw_msleep_os(10);
+			msleep(10);
 		if (rtw_hal_sreset_inprogress(padapter))
 			RTW_INFO("%s wait sreset_inprogress timeout\n", __func__);
 		else
@@ -2541,7 +2541,7 @@ int _rtw_pwr_wakeup(_adapter *padapter, u32 ips_deffer_ms, const char *caller)
 		       && ((rtw_get_passing_time_ms(start) <= 3000 && !rtw_is_do_late_resume(pwrpriv))
 			|| (rtw_get_passing_time_ms(start) <= 500 && rtw_is_do_late_resume(pwrpriv)))
 		      )
-			rtw_msleep_os(10);
+			msleep(10);
 		if (pwrpriv->bInSuspend)
 			RTW_INFO("%s wait bInSuspend timeout\n", __func__);
 		else
diff --git a/core/rtw_recv.c b/core/rtw_recv.c
index 2355adf..ab9aa66 100644
--- a/core/rtw_recv.c
+++ b/core/rtw_recv.c
@@ -5007,7 +5007,7 @@ thread_return rtw_recv_thread(thread_context context)
 		if (err == RTW_RFRAME_UNAVAIL
 			|| err == RTW_RFRAME_PKT_UNAVAIL
 		) {
-			rtw_msleep_os(1);
+			msleep(1);
 			_rtw_up_sema(&recvpriv->recv_sema);
 		}
 
diff --git a/core/rtw_tdls.c b/core/rtw_tdls.c
index caa8697..08881dc 100644
--- a/core/rtw_tdls.c
+++ b/core/rtw_tdls.c
@@ -382,7 +382,7 @@ int issue_nulldata_to_TDLS_peer_STA(_adapter *padapter, unsigned char *da, unsig
 			break;
 
 		if (i < try_cnt && wait_ms > 0 && ret == _FAIL)
-			rtw_msleep_os(wait_ms);
+			msleep(wait_ms);
 
 	} while ((i < try_cnt) && (ret == _FAIL || wait_ms == 0));
 
@@ -1051,7 +1051,7 @@ s32 rtw_tdls_do_ch_sw(_adapter *padapter, struct sta_info *ptdls_sta, u8 chnl_ty
 				wait_time = 0;
 
 			if (wait_time > 0)
-				rtw_msleep_os(wait_time);
+				msleep(wait_time);
 		}
 	}
 
diff --git a/core/rtw_xmit.c b/core/rtw_xmit.c
index 4ab7066..fc86341 100644
--- a/core/rtw_xmit.c
+++ b/core/rtw_xmit.c
@@ -165,7 +165,7 @@ s32	_rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, _adapter *padapter)
 		/* Tx buf allocation may fail sometimes, so sleep and retry. */
 		res = rtw_os_xmit_resource_alloc(padapter, pxmitbuf, (MAX_XMITBUF_SZ + XMITBUF_ALIGN_SZ), _TRUE);
 		if (res == _FAIL) {
-			rtw_msleep_os(10);
+			msleep(10);
 			res = rtw_os_xmit_resource_alloc(padapter, pxmitbuf, (MAX_XMITBUF_SZ + XMITBUF_ALIGN_SZ), _TRUE);
 			if (res == _FAIL)
 				goto exit;
@@ -1622,7 +1622,7 @@ static s32 xmitframe_addmic(_adapter *padapter, struct xmit_frame *pxmitframe)
 			if (bmcst) {
 				if (_rtw_memcmp(psecuritypriv->dot118021XGrptxmickey[psecuritypriv->dot118021XGrpKeyid].skey, null_key, 16) == _TRUE) {
 					/* DbgPrint("\nxmitframe_addmic:stainfo->dot11tkiptxmickey==0\n"); */
-					/* rtw_msleep_os(10); */
+					/* msleep(10); */
 					return _FAIL;
 				}
 				/* start to calculate the mic code */
@@ -1630,7 +1630,7 @@ static s32 xmitframe_addmic(_adapter *padapter, struct xmit_frame *pxmitframe)
 			} else {
 				if (_rtw_memcmp(&pattrib->dot11tkiptxmickey.skey[0], null_key, 16) == _TRUE) {
 					/* DbgPrint("\nxmitframe_addmic:stainfo->dot11tkiptxmickey==0\n"); */
-					/* rtw_msleep_os(10); */
+					/* msleep(10); */
 					return _FAIL;
 				}
 				/* start to calculate the mic code */
diff --git a/hal/hal_btcoex.c b/hal/hal_btcoex.c
index ea5b400..fe82b81 100644
--- a/hal/hal_btcoex.c
+++ b/hal/hal_btcoex.c
@@ -413,7 +413,7 @@ void halbtcoutsrc_LeaveLowPower(PBTC_COEXIST pBtCoexist)
 		if (utime > timeout)
 			break;
 
-		rtw_msleep_os(1);
+		msleep(1);
 	} while (1);
 
 	GLBtcBtCoexAliveRegistered = _TRUE;
diff --git a/hal/hal_com.c b/hal/hal_com.c
index a0eecd5..cb0bf22 100644
--- a/hal/hal_com.c
+++ b/hal/hal_com.c
@@ -1609,7 +1609,7 @@ int hal_read_mac_hidden_rpt(_adapter *adapter)
 		id = rtw_read8(adapter, REG_C2HEVT_MSG_NORMAL);
 		if (id == C2H_MAC_HIDDEN_RPT || RTW_CANNOT_IO(adapter))
 			break;
-		rtw_msleep_os(10);
+		msleep(10);
 	} while (rtw_get_passing_time_ms(start) < timeout_ms || cnt < min_cnt);
 
 	if (id == C2H_MAC_HIDDEN_RPT) {
@@ -4906,7 +4906,7 @@ static u8 rtw_hal_check_wow_ctrl(_adapter *adapter, u8 chk_type)
 				RTW_PRINT("Loop index: %d :0x%02x\n",
 					  trycnt, reason);
 				trycnt--;
-				rtw_msleep_os(20);
+				msleep(20);
 			}
 			if (!reason)
 				res = _TRUE;
@@ -4919,7 +4919,7 @@ static u8 rtw_hal_check_wow_ctrl(_adapter *adapter, u8 chk_type)
 			RTW_PRINT("%s REG_FE1IMR (reg120): 0x%x, REG_RXPKT_NUM(reg284): 0x%x\n", __func__, fe1_imr, rxpkt_num);
 
 			while (((fe1_imr & BIT_FS_RXDONE_INT_EN) || (rxpkt_num & BIT_RW_RELEASE_EN)) && trycnt > 1) {
-				rtw_msleep_os(20);
+				msleep(20);
 				fe1_imr = rtw_read32(adapter, REG_FE1IMR);
 				rxpkt_num = rtw_read32(adapter, REG_RXPKT_NUM);
 				RTW_PRINT("Loop index: %d :0x%x, 0x%x\n",
@@ -4943,7 +4943,7 @@ static u8 rtw_hal_check_wow_ctrl(_adapter *adapter, u8 chk_type)
 				RTW_PRINT("Loop index: %d :0x%02x\n",
 					  trycnt, mstatus);
 				trycnt--;
-				rtw_msleep_os(20);
+				msleep(20);
 			}
 			if (mstatus & BIT1)
 				res = _TRUE;
@@ -4955,7 +4955,7 @@ static u8 rtw_hal_check_wow_ctrl(_adapter *adapter, u8 chk_type)
 				RTW_PRINT("Loop index: %d :0x%02x\n",
 					  trycnt, mstatus);
 				trycnt--;
-				rtw_msleep_os(20);
+				msleep(20);
 			}
 
 			if (mstatus & BIT1)
@@ -4984,7 +4984,7 @@ static u8 rtw_hal_check_pno_enabled(_adapter *adapter)
 				 count, res);
 			res = rtw_read8(adapter, REG_PNO_STATUS);
 			count++;
-			rtw_msleep_os(2);
+			msleep(2);
 		}
 		if (res & BIT(7))
 			ret = _TRUE;
@@ -5799,7 +5799,7 @@ static void rtw_hal_set_ap_rsvdpage_loc_cmd(PADAPTER padapter,
 	if (ret == _FAIL)
 		RTW_INFO("%s: H2C_BCN_RSVDPAGE cmd fail\n", __func__);
 
-	rtw_msleep_os(10);
+	msleep(10);
 
 	_rtw_memset(&rsvdparm, 0, sizeof(rsvdparm));
 
@@ -5812,7 +5812,7 @@ static void rtw_hal_set_ap_rsvdpage_loc_cmd(PADAPTER padapter,
 	if (ret == _FAIL)
 		RTW_INFO("%s: H2C_PROBERSP_RSVDPAGE cmd fail\n", __func__);
 
-	rtw_msleep_os(10);
+	msleep(10);
 }
 
 static void rtw_hal_set_fw_ap_wow_related_cmd(_adapter *padapter, u8 enable)
@@ -5854,7 +5854,7 @@ static void rtw_hal_ap_wow_enable(_adapter *padapter)
 
 	issue_beacon(padapter, 0);
 
-	rtw_msleep_os(2);
+	msleep(2);
 	#if defined(CONFIG_RTL8188E)
 	if (IS_HARDWARE_TYPE_8188E(padapter))
 		rtw_hal_disable_tx_report(padapter);
@@ -5911,7 +5911,7 @@ static void rtw_hal_ap_wow_disable(_adapter *padapter)
 
 	rtw_hal_set_fw_ap_wow_related_cmd(padapter, 0);
 
-	rtw_msleep_os(2);
+	msleep(2);
 #ifdef DBG_CHECK_FW_PS_STATE
 	if (rtw_fw_ps_state(padapter) == _FAIL) {
 		pdbgpriv->dbg_diswow_dload_fw_fail_cnt++;
@@ -11032,7 +11032,7 @@ int rtw_hal_reset_tsf(_adapter *adapter, u8 reset_port)
 		return ret;
 
 	while ((reset_cnt_after == reset_cnt_before) && (loop_cnt < 10)) {
-		rtw_msleep_os(100);
+		msleep(100);
 		loop_cnt++;
 		reset_cnt_after = rtw_read8(adapter, reg_reset_tsf_cnt);
 	}
@@ -11512,7 +11512,7 @@ void rtw_lps_state_chk(_adapter *adapter, u8 ps_mode)
 				ps_ready = _TRUE;
 				break;
 			}
-			rtw_msleep_os(1);
+			msleep(1);
 		} while (leave_wait_count--);
 
 		if (ps_ready == _FALSE) {
@@ -13612,7 +13612,7 @@ void rtw_reset_phy_rx_counters(_adapter *padapter)
 		phy_set_bb_reg(padapter, 0xA2C, BIT15, 0x1);
 	} else {
 		phy_set_bb_reg(padapter, 0xF14, BIT16, 0x1);
-		rtw_msleep_os(10);
+		msleep(10);
 		phy_set_bb_reg(padapter, 0xF14, BIT16, 0x0);
 
 		phy_set_bb_reg(padapter, 0xD00, BIT27, 0x1);/* reset  OFDA FA counter */
diff --git a/hal/hal_com_phycfg.c b/hal/hal_com_phycfg.c
index 7e68568..99c48c4 100644
--- a/hal/hal_com_phycfg.c
+++ b/hal/hal_com_phycfg.c
@@ -4207,7 +4207,7 @@ phy_ConfigBBWithParaFile(
 						break;
 					} else if (u4bRegOffset == 0xfe || u4bRegOffset == 0xffe) {
 #ifdef CONFIG_LONG_DELAY_ISSUE
-						rtw_msleep_os(50);
+						msleep(50);
 #else
 						rtw_mdelay_os(50);
 #endif
@@ -4555,7 +4555,7 @@ phy_ConfigBBWithMpParaFile(
 						break;
 					} else if (u4bRegOffset == 0xfe || u4bRegOffset == 0xffe) {
 #ifdef CONFIG_LONG_DELAY_ISSUE
-						rtw_msleep_os(50);
+						msleep(50);
 #else
 						rtw_mdelay_os(50);
 #endif
@@ -4669,7 +4669,7 @@ PHY_ConfigRFWithParaFile(
 					if (u4bRegOffset == 0xfe || u4bRegOffset == 0xffe) {
 						/* Deay specific ms. Only RF configuration require delay.												 */
 #ifdef CONFIG_LONG_DELAY_ISSUE
-						rtw_msleep_os(50);
+						msleep(50);
 #else
 						rtw_mdelay_os(50);
 #endif
diff --git a/hal/hal_halmac.c b/hal/hal_halmac.c
index a12abab..5de1b3f 100644
--- a/hal/hal_halmac.c
+++ b/hal/hal_halmac.c
@@ -414,7 +414,7 @@ static void _halmac_udelay(void *p, u32 us)
 	else if (us <= 1000)
 		rtw_usleep_os(us);
 	else
-		rtw_msleep_os(RTW_DIV_ROUND_UP(us, 1000));
+		msleep(RTW_DIV_ROUND_UP(us, 1000));
 }
 
 static u8 _halmac_mutex_init(void *p, HALMAC_MUTEX *pMutex)
@@ -3088,7 +3088,7 @@ static void _debug_dlfw_fail(struct dvobj_priv *d)
 	}
 
 	/* read 0x80 after 10 secs */
-	rtw_msleep_os(10000);
+	msleep(10000);
 	addr = 0x80;
 	v32 = rtw_read16(a, addr);
 	RTW_PRINT("%s: 0x%X = 0x%04x (after 10 secs)\n",
@@ -3178,7 +3178,7 @@ static int _cpu_sleep(struct dvobj_priv *d, u32 timeout)
 			break;
 		}
 
-		rtw_msleep_os(1);
+		msleep(1);
 	} while (1);
 
 exit:
@@ -3668,7 +3668,7 @@ int rtw_halmac_txfifo_wait_empty(struct dvobj_priv *d, u32 timeout)
 			break;
 		}
 
-		rtw_msleep_os(2);
+		msleep(2);
 	} while (1);
 
 	if (empty == _FALSE) {
@@ -3919,7 +3919,7 @@ static u8 _is_fw_read_cmd_down(PADAPTER adapter, u8 msgbox_num)
 		if (0 == valid)
 			read_down = _TRUE;
 		else
-			rtw_msleep_os(1);
+			msleep(1);
 	} while ((!read_down) && (retry_cnts--));
 
 	if (_FALSE == read_down)
@@ -4631,7 +4631,7 @@ int rtw_halmac_iqk(struct dvobj_priv *d, u8 clear, u8 segment)
 		if (!retry)
 			break;
 		retry--;
-		rtw_msleep_os(delay);
+		msleep(delay);
 	} while (1);
 	if (status != HALMAC_RET_SUCCESS) {
 		free_halmac_event(d, id);
diff --git a/hal/hal_mp.c b/hal/hal_mp.c
index 1af9de3..a6811a2 100644
--- a/hal/hal_mp.c
+++ b/hal/hal_mp.c
@@ -1631,12 +1631,12 @@ void hal_mpt_GetThermalMeter(PADAPTER pAdapter, u8 *value)
 {
 #if 0
 	fw_cmd(pAdapter, IOCMD_GET_THERMAL_METER);
-	rtw_msleep_os(1000);
+	msleep(1000);
 	fw_cmd_data(pAdapter, value, 1);
 	*value &= 0xFF;
 #else
 	hal_mpt_TriggerRFThermalMeter(pAdapter);
-	rtw_msleep_os(1000);
+	msleep(1000);
 	*value = hal_mpt_ReadRFThermalMeter(pAdapter);
 #endif
 
@@ -1680,7 +1680,7 @@ void hal_mpt_SetSingleCarrierTx(PADAPTER pAdapter, u8 bStart)
 #endif /* CONFIG_RTL8812A || CONFIG_RTL8821A || CONFIG_RTL8814A || CONFIG_RTL8822B || CONFIG_RTL8821C */
 			phy_set_bb_reg(pAdapter, rOFDM1_LSTF, BIT30 | BIT29 | BIT28, OFDM_ALL_OFF);
 
-		rtw_msleep_os(10);
+		msleep(10);
 		/*/BB Reset*/
 		phy_set_bb_reg(pAdapter, rPMAC_Reset, bBBResetB, 0x0);
 		phy_set_bb_reg(pAdapter, rPMAC_Reset, bBBResetB, 0x1);
diff --git a/hal/phydm/phydm_interface.c b/hal/phydm/phydm_interface.c
index 7fb1a25..cec3be4 100644
--- a/hal/phydm/phydm_interface.c
+++ b/hal/phydm/phydm_interface.c
@@ -632,11 +632,11 @@ void ODM_sleep_ms(u32 ms)
 #elif (DM_ODM_SUPPORT_TYPE & ODM_CE) && defined(DM_ODM_CE_MAC80211_V2)
 	msleep(ms);
 #elif (DM_ODM_SUPPORT_TYPE & ODM_CE)
-	rtw_msleep_os(ms);
+	msleep(ms);
 #elif (DM_ODM_SUPPORT_TYPE & ODM_WIN)
 	delay_ms(ms);
 #elif (DM_ODM_SUPPORT_TYPE & ODM_IOT)
-	rtw_msleep_os(ms);
+	msleep(ms);
 #endif
 }
 
diff --git a/hal/rtl8192e/rtl8192e_cmd.c b/hal/rtl8192e/rtl8192e_cmd.c
index 69da857..6723d7e 100644
--- a/hal/rtl8192e/rtl8192e_cmd.c
+++ b/hal/rtl8192e/rtl8192e_cmd.c
@@ -40,7 +40,7 @@ static u8 _is_fw_read_cmd_down(_adapter *padapter, u8 msgbox_num)
 		if (0 == valid)
 			read_down = _TRUE;
 		else
-			rtw_msleep_os(1);
+			msleep(1);
 	} while ((!read_down) && (retry_cnts--));
 
 	return read_down;
diff --git a/hal/rtl8192e/rtl8192e_hal_init.c b/hal/rtl8192e/rtl8192e_hal_init.c
index 202b073..7808ae4 100644
--- a/hal/rtl8192e/rtl8192e_hal_init.c
+++ b/hal/rtl8192e/rtl8192e_hal_init.c
@@ -4047,7 +4047,7 @@ u8 SetHwReg8192E(PADAPTER Adapter, u8 variable, u8 *val)
 
 				i++;
 				/* wait MAC to flush out reserve pages */
-				rtw_msleep_os(10);
+				msleep(10);
 			}
 
 			pass_ms = rtw_get_passing_time_ms(start);
@@ -4423,7 +4423,7 @@ void hal_ra_info_dump(_adapter *padapter , void *sel)
 			_RTW_PRINT_SEL(sel , "============ RA status check  Mac_id:%d ===================\n", mac_id);
 			cmd = 0x40000100 | mac_id;
 			rtw_write32(padapter, REG_HMEBOX_E2_E3_8192E, cmd);
-			rtw_msleep_os(10);
+			msleep(10);
 			ra_info1 = rtw_read32(padapter, REG_RSVD5_8192E);
 			curr_tx_sgi = rtw_get_current_tx_sgi(padapter, macid_ctl->sta[mac_id]);
 			curr_tx_rate = rtw_get_current_tx_rate(padapter, macid_ctl->sta[mac_id]);
@@ -4433,7 +4433,7 @@ void hal_ra_info_dump(_adapter *padapter , void *sel)
 
 			cmd = 0x40000400 | mac_id;
 			rtw_write32(padapter, REG_HMEBOX_E2_E3_8192E, cmd);
-			rtw_msleep_os(10);
+			msleep(10);
 			ra_info1 = rtw_read32(padapter, REG_RSVD5_8192E);
 			ra_info2 = rtw_read32(padapter, REG_RSVD6_8192E);
 			rate_mask1 = rtw_read32(padapter, REG_RSVD7_8192E);
diff --git a/hal/rtl8192e/rtl8192e_phycfg.c b/hal/rtl8192e/rtl8192e_phycfg.c
index 2ac1a21..6842de4 100644
--- a/hal/rtl8192e/rtl8192e_phycfg.c
+++ b/hal/rtl8192e/rtl8192e_phycfg.c
@@ -930,7 +930,7 @@ phy_SpurCalibration_8192E(
 		phy_set_bb_reg(Adapter, rFPGA0_TxInfo, bMaskByte0, 0x3);
 		phy_set_bb_reg(Adapter, rFPGA0_PSDFunction, bMaskDWord, 0xfccd);
 		phy_set_bb_reg(Adapter, rFPGA0_PSDFunction, bMaskDWord, 0x40fccd);
-		/* rtw_msleep_os(30); */
+		/* msleep(30); */
 		rtw_mdelay_os(30);
 		PSDReport = phy_query_bb_reg(Adapter, rFPGA0_PSDReport, bMaskDWord);
 		/* RTW_INFO(" Path A== PSDReport = 0x%x (%d)\n",PSDReport,PSDReport); */
@@ -945,7 +945,7 @@ phy_SpurCalibration_8192E(
 		phy_set_bb_reg(Adapter, rFPGA0_TxInfo, bMaskByte0, 0x13);
 		phy_set_bb_reg(Adapter, rFPGA0_PSDFunction, bMaskDWord, 0xfccd);
 		phy_set_bb_reg(Adapter, rFPGA0_PSDFunction, bMaskDWord, 0x40fccd);
-		/* rtw_msleep_os(30); */
+		/* msleep(30); */
 		rtw_mdelay_os(30);
 		PSDReport = phy_query_bb_reg(Adapter, rFPGA0_PSDReport, bMaskDWord);
 		/* RTW_INFO(" Path B== PSDReport = 0x%x (%d)\n",PSDReport,PSDReport); */
diff --git a/include/osdep_service.h b/include/osdep_service.h
index d17467f..093e405 100644
--- a/include/osdep_service.h
+++ b/include/osdep_service.h
@@ -364,7 +364,6 @@ extern bool _rtw_time_after(systime a, systime b);
 
 extern void	rtw_sleep_schedulable(int ms);
 
-extern void	rtw_msleep_os(int ms);
 extern void	rtw_usleep_os(int us);
 
 extern u32	rtw_atoi(u8 *s);
@@ -416,7 +415,7 @@ static inline void rtw_thread_wait_stop(void)
 #ifdef PLATFORM_LINUX
 	#if 0
 	while (!kthread_should_stop())
-		rtw_msleep_os(10);
+		msleep(10);
 	#else
 	set_current_state(TASK_INTERRUPTIBLE);
 	while (!kthread_should_stop()) {
diff --git a/os_dep/linux/ioctl_cfg80211.c b/os_dep/linux/ioctl_cfg80211.c
index 7846aef..4db2808 100644
--- a/os_dep/linux/ioctl_cfg80211.c
+++ b/os_dep/linux/ioctl_cfg80211.c
@@ -2539,7 +2539,7 @@ u32 rtw_cfg80211_wait_scan_req_empty(_adapter *adapter, u32 timeout_ms)
 			break;
 		}
 
-		rtw_msleep_os(10);
+		msleep(10);
 	}
 
 	pass_ms = rtw_get_passing_time_ms(start);
@@ -6511,7 +6511,7 @@ void rtw_cfg80211_issue_p2p_provision_request(_adapter *padapter, const u8 *buf,
 	#if 0
 	if(wps_devicepassword_id == WPS_DPID_REGISTRAR_SPEC) {
 		RTW_INFO("waiting for p2p peer key-in PIN CODE\n");
-		rtw_msleep_os(15000); /* 15 sec for key in PIN CODE, workaround for GS2 before issuing Nego Req. */
+		msleep(15000); /* 15 sec for key in PIN CODE, workaround for GS2 before issuing Nego Req. */
 	}
 	#endif
 
@@ -7149,7 +7149,7 @@ issue_mgmt_frame:
 
 #ifdef CONFIG_XMIT_ACK
 			if (!MLME_IS_MESH(padapter)) /* TODO: remove this sleep for all mode */
-				rtw_msleep_os(50);
+				msleep(50);
 #endif
 #ifdef CONFIG_DEBUG_CFG80211
 			RTW_INFO("%s, ack=%d, ok!\n", __func__, ack);
@@ -7426,7 +7426,7 @@ dump:
 			break;
 
 		if (sleep_ms > 0)
-			rtw_msleep_os(sleep_ms);
+			msleep(sleep_ms);
 	}
 
 	if (tx_ret != _SUCCESS || dump_cnt > 1) {
@@ -8855,7 +8855,7 @@ int	cfg80211_rtw_resume(struct wiphy *wiphy) {
 		for (PNOWakeupScanWaitCnt = 0; PNOWakeupScanWaitCnt < 10; PNOWakeupScanWaitCnt++) {
 			if(check_fwstate(pmlmepriv, _FW_UNDER_SURVEY) == _FALSE)
 				break;
-			rtw_msleep_os(1000);
+			msleep(1000);
 		}
 		
 		_enter_critical_bh(&pmlmepriv->lock, &irqL);
diff --git a/os_dep/linux/ioctl_linux.c b/os_dep/linux/ioctl_linux.c
index 3aca931..ddfb168 100644
--- a/os_dep/linux/ioctl_linux.c
+++ b/os_dep/linux/ioctl_linux.c
@@ -2230,7 +2230,7 @@ static int rtw_wx_get_scan(struct net_device *dev, struct iw_request_info *a,
 		      ;
 
 	while (check_fwstate(pmlmepriv, wait_status) == _TRUE) {
-		rtw_msleep_os(30);
+		msleep(30);
 		cnt++;
 		if (cnt > wait_for_surveydone)
 			break;
@@ -3726,7 +3726,7 @@ static int rtw_get_ap_info(struct net_device *dev,
 	}
 
 	while ((check_fwstate(pmlmepriv, (_FW_UNDER_SURVEY | _FW_UNDER_LINKING))) == _TRUE) {
-		rtw_msleep_os(30);
+		msleep(30);
 		cnt++;
 		if (cnt > 100)
 			break;
@@ -6524,7 +6524,7 @@ static int rtw_dbg_port(struct net_device *dev,
 					d_data = rtw_read32(padapter, 0x04);
 					imr =  rtw_read32(padapter, 0x10250014);
 					rtw_write32(padapter, 0x10250014, 0);
-					rtw_msleep_os(50);
+					msleep(50);
 
 					i_data = rtw_sd_iread32(padapter, 0x04);
 
@@ -6541,13 +6541,13 @@ static int rtw_dbg_port(struct net_device *dev,
 						RTW_ERR("test_code :0x%02x, i_data : 0x%08x\n", test_code, i_data);
 					}
 					if ((j++) == 100) {
-						rtw_msleep_os(2000);
+						msleep(2000);
 						RTW_INFO(" Indirect access testing..........%d/%d\n", i, test_cnts);
 						j = 0;
 					}
 
 					test_code = ~test_code;
-					rtw_msleep_os(50);
+					msleep(50);
 				}
 				RTW_INFO("========Indirect access test=========\n");
 				RTW_INFO(" test_cnts = %d\n", test_cnts);
@@ -9221,11 +9221,11 @@ static int rtw_mp_efuse_set(struct net_device *dev,
 		/* unknown bug workaround, need to fix later */
 		addr = 0x1ff;
 		rtw_write8(padapter, EFUSE_CTRL + 1, (addr & 0xff));
-		rtw_msleep_os(10);
+		msleep(10);
 		rtw_write8(padapter, EFUSE_CTRL + 2, ((addr >> 8) & 0x03));
-		rtw_msleep_os(10);
+		msleep(10);
 		rtw_write8(padapter, EFUSE_CTRL + 3, 0x72);
-		rtw_msleep_os(10);
+		msleep(10);
 		rtw_read8(padapter, EFUSE_CTRL);
 #endif /* RTW_HALMAC */
 
@@ -9510,11 +9510,11 @@ static int rtw_mp_efuse_set(struct net_device *dev,
 		BTEfuse_PowerSwitch(padapter, 1, _TRUE);
 		addr = 0x1ff;
 		rtw_write8(padapter, EFUSE_CTRL + 1, (addr & 0xff));
-		rtw_msleep_os(10);
+		msleep(10);
 		rtw_write8(padapter, EFUSE_CTRL + 2, ((addr >> 8) & 0x03));
-		rtw_msleep_os(10);
+		msleep(10);
 		rtw_write8(padapter, EFUSE_CTRL + 3, 0x72);
-		rtw_msleep_os(10);
+		msleep(10);
 		rtw_read8(padapter, EFUSE_CTRL);
 		BTEfuse_PowerSwitch(padapter, 1, _FALSE);
 #endif /* RTW_HALMAC */
@@ -9612,11 +9612,11 @@ static int rtw_mp_efuse_set(struct net_device *dev,
 		BTEfuse_PowerSwitch(padapter, 1, _TRUE);
 		addr = 0x1ff;
 		rtw_write8(padapter, EFUSE_CTRL + 1, (addr & 0xff));
-		rtw_msleep_os(10);
+		msleep(10);
 		rtw_write8(padapter, EFUSE_CTRL + 2, ((addr >> 8) & 0x03));
-		rtw_msleep_os(10);
+		msleep(10);
 		rtw_write8(padapter, EFUSE_CTRL + 3, 0x72);
-		rtw_msleep_os(10);
+		msleep(10);
 		rtw_read8(padapter, EFUSE_CTRL);
 		BTEfuse_PowerSwitch(padapter, 1, _FALSE);
 #endif /* RTW_HALMAC */
@@ -10438,7 +10438,7 @@ static int rtw_priv_get(struct net_device *dev,
 		return -EIO;
 	}
 
-	rtw_msleep_os(10); /* delay 5ms for sending pkt before exit adb shell operation */
+	msleep(10); /* delay 5ms for sending pkt before exit adb shell operation */
 	return 0;
 }
 
@@ -11850,7 +11850,7 @@ static void loopbackTest(PADAPTER padapter, u32 cnt, u32 size, u8 *pmsg)
 			len = strlen(ploopback->msg);
 			if (len)
 				break;
-			rtw_msleep_os(1);
+			msleep(1);
 		} while (1);
 		_rtw_memcpy(pmsg, ploopback->msg, len + 1);
 		freeLoopback(padapter);
diff --git a/os_dep/linux/ioctl_mp.c b/os_dep/linux/ioctl_mp.c
index c4ef5a6..71de17c 100644
--- a/os_dep/linux/ioctl_mp.c
+++ b/os_dep/linux/ioctl_mp.c
@@ -1667,7 +1667,7 @@ int rtw_mp_pretx_proc(PADAPTER padapter, u8 bStartTest, char *extra)
 
 		if (pmp_priv->tx.stop == 0) {
 			pmp_priv->tx.stop = 1;
-			rtw_msleep_os(5);
+			msleep(5);
 		}
 #ifdef CONFIG_80211N_HT
 		if(padapter->registrypriv.ht_enable &&
@@ -2460,10 +2460,10 @@ int rtw_mp_SetBT(struct net_device *dev,
 		MPT_PwrCtlDM(padapter, 0);
 		rtw_write32(padapter, 0xcc, (rtw_read32(padapter, 0xcc) | 0x00000004));
 		rtw_write32(padapter, 0x6b, (rtw_read32(padapter, 0x6b) & 0xFFFFFFEF));
-		rtw_msleep_os(600);
+		msleep(600);
 		rtw_write32(padapter, 0x6b, (rtw_read32(padapter, 0x6b) | 0x00000010));
 		rtw_write32(padapter, 0xcc, (rtw_read32(padapter, 0xcc) & 0xFFFFFFFB));
-		rtw_msleep_os(1200);
+		msleep(1200);
 		pBTFirmware = (PRT_MP_FIRMWARE)rtw_zmalloc(sizeof(RT_MP_FIRMWARE));
 		if (pBTFirmware == NULL)
 			goto exit;
@@ -2473,13 +2473,13 @@ int rtw_mp_SetBT(struct net_device *dev,
 			rtw_mfree((u8 *)pBTFirmware, sizeof(RT_MP_FIRMWARE));
 
 		RTW_INFO("Wait for FirmwareDownloadBT fw boot!\n");
-		rtw_msleep_os(2000);
+		msleep(2000);
 		_rtw_memset(extra, '\0', wrqu->data.length);
 		BtReq.opCodeVer = 1;
 		BtReq.OpCode = 0;
 		BtReq.paraLength = 0;
 		mptbt_BtControlProcess(padapter, &BtReq);
-		rtw_msleep_os(100);
+		msleep(100);
 
 		RTW_INFO("FirmwareDownloadBT ready = 0x%x 0x%x", pMptCtx->mptOutBuf[4], pMptCtx->mptOutBuf[5]);
 		if ((pMptCtx->mptOutBuf[4] == 0x00) && (pMptCtx->mptOutBuf[5] == 0x00)) {
@@ -2522,10 +2522,10 @@ int rtw_mp_SetBT(struct net_device *dev,
 		MPT_PwrCtlDM(padapter, 0);
 		rtw_write32(padapter, 0xcc, (rtw_read32(padapter, 0xcc) | 0x00000004));
 		rtw_write32(padapter, 0x6b, (rtw_read32(padapter, 0x6b) & 0xFFFFFFEF));
-		rtw_msleep_os(600);
+		msleep(600);
 		rtw_write32(padapter, 0x6b, (rtw_read32(padapter, 0x6b) | 0x00000010));
 		rtw_write32(padapter, 0xcc, (rtw_read32(padapter, 0xcc) & 0xFFFFFFFB));
-		rtw_msleep_os(1200);
+		msleep(1200);
 
 #if defined(CONFIG_PLATFORM_SPRD) && (MP_DRIVER == 1)
 		/* Pull up BT reset pin.*/
@@ -2538,7 +2538,7 @@ int rtw_mp_SetBT(struct net_device *dev,
 		status = rtl8723b_FirmwareDownload(padapter, _FALSE);
 #endif
 		RTW_INFO("Wait for FirmwareDownloadBT fw boot!\n");
-		rtw_msleep_os(1000);
+		msleep(1000);
 #ifdef CONFIG_BT_COEXIST
 		rtw_btcoex_HaltNotify(padapter);
 		RTW_INFO("SetBT btcoex HaltNotify !\n");
@@ -2550,7 +2550,7 @@ int rtw_mp_SetBT(struct net_device *dev,
 		BtReq.OpCode = 0;
 		BtReq.paraLength = 0;
 		mptbt_BtControlProcess(padapter, &BtReq);
-		rtw_msleep_os(200);
+		msleep(200);
 
 		RTW_INFO("FirmwareDownloadBT ready = 0x%x 0x%x", pMptCtx->mptOutBuf[4], pMptCtx->mptOutBuf[5]);
 		if ((pMptCtx->mptOutBuf[4] == 0x00) && (pMptCtx->mptOutBuf[5] == 0x00)) {
@@ -2562,7 +2562,7 @@ int rtw_mp_SetBT(struct net_device *dev,
 #ifdef CONFIG_BT_COEXIST
 			rtw_btcoex_SwitchBtTRxMask(padapter);
 #endif
-			rtw_msleep_os(200);
+			msleep(200);
 			sprintf(extra, "download FW OK.\n");
 			goto exit;
 		}
@@ -2583,23 +2583,23 @@ int rtw_mp_SetBT(struct net_device *dev,
 		MPT_PwrCtlDM(padapter, 0);
 		rtw_write32(padapter, 0xcc, (rtw_read32(padapter, 0xcc) | 0x00000004));
 		rtw_write32(padapter, 0x6b, (rtw_read32(padapter, 0x6b) & 0xFFFFFFEF));
-		rtw_msleep_os(600);
+		msleep(600);
 		/*rtw_write32(padapter, 0x6a, (rtw_read32(padapter, 0x6a)& 0xFFFFFFFE));*/
 		rtw_write32(padapter, 0x6b, (rtw_read32(padapter, 0x6b) | 0x00000010));
 		rtw_write32(padapter, 0xcc, (rtw_read32(padapter, 0xcc) & 0xFFFFFFFB));
-		rtw_msleep_os(1200);
+		msleep(1200);
 		goto exit;
 	}
 	if (strncmp(extra, "disable", 7) == 0) {
 		RTW_INFO("SetBT disable !\n");
 		rtw_write32(padapter, 0x6a, (rtw_read32(padapter, 0x6a) & 0xFFFFFFFB));
-		rtw_msleep_os(500);
+		msleep(500);
 		goto exit;
 	}
 	if (strncmp(extra, "enable", 6) == 0) {
 		RTW_INFO("SetBT enable !\n");
 		rtw_write32(padapter, 0x6a, (rtw_read32(padapter, 0x6a) | 0x00000004));
-		rtw_msleep_os(500);
+		msleep(500);
 		goto exit;
 	}
 	if (strncmp(extra, "h2c", 3) == 0) {
diff --git a/os_dep/linux/os_intfs.c b/os_dep/linux/os_intfs.c
index 93ebe21..cf37f0a 100644
--- a/os_dep/linux/os_intfs.c
+++ b/os_dep/linux/os_intfs.c
@@ -3882,7 +3882,7 @@ static int netdev_close(struct net_device *pnetdev)
 
 	RTW_INFO("netdev_close, bips_processing=%d\n", pwrctl->bips_processing);
 	while (pwrctl->bips_processing == _TRUE) /* waiting for ips_processing done before call rtw_dev_unload() */
-		rtw_msleep_os(1);
+		msleep(1);
 
 	rtw_dev_unload(padapter);
 	rtw_sdio_set_power(0);
@@ -4646,7 +4646,7 @@ int rtw_suspend_common(_adapter *padapter)
 	pwrpriv->bInSuspend = _TRUE;
 
 	while (pwrpriv->bips_processing == _TRUE)
-		rtw_msleep_os(1);
+		msleep(1);
 
 #ifdef CONFIG_IOL_READ_EFUSE_MAP
 	if (!padapter->bup) {
diff --git a/os_dep/osdep_service.c b/os_dep/osdep_service.c
index a66ce42..2d8b36b 100644
--- a/os_dep/osdep_service.c
+++ b/os_dep/osdep_service.c
@@ -1597,32 +1597,6 @@ void rtw_sleep_schedulable(int ms)
 }
 
 
-void rtw_msleep_os(int ms)
-{
-
-#ifdef PLATFORM_LINUX
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36))
-	if (ms < 20) {
-		unsigned long us = ms * 1000UL;
-		usleep_range(us, us + 1000UL);
-	} else
-#endif
-		msleep((unsigned int)ms);
-
-#endif
-#ifdef PLATFORM_FREEBSD
-	/* Delay for delay microseconds */
-	DELAY(ms * 1000);
-	return ;
-#endif
-#ifdef PLATFORM_WINDOWS
-
-	NdisMSleep(ms * 1000); /* (us)*1000=(ms) */
-
-#endif
-
-
-}
 void rtw_usleep_os(int us)
 {
 #ifdef PLATFORM_LINUX
@@ -1660,7 +1634,7 @@ void _rtw_mdelay_os(int ms, const char *func, const int line)
 #if 0
 	if (ms > 10)
 		RTW_INFO("%s:%d %s(%d)\n", func, line, __FUNCTION__, ms);
-	rtw_msleep_os(ms);
+	msleep(ms);
 	return;
 #endif