diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
index 870c9cd5cdf3..ec32c4bae920 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
@@ -1329,9 +1329,9 @@ struct rtl8xxxu_fileops {
 	void (*report_connect) (struct rtl8xxxu_priv *priv,
 				u8 macid, bool connect);
 	int writeN_block_size;
-	char tx_desc_size;
-	char rx_desc_size;
-	char has_s0s1;
+	s8 tx_desc_size;
+	s8 rx_desc_size;
+	s8 has_s0s1;
 	u32 adda_1t_init;
 	u32 adda_1t_path_on;
 	u32 adda_2t_path_on_a;
diff --git a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c
index b660c214dc71..91cc1397b150 100644
--- a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c
+++ b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c
@@ -901,7 +901,7 @@ void exhalbtc_stack_update_profile_info(void)
 {
 }
 
-void exhalbtc_update_min_bt_rssi(char bt_rssi)
+void exhalbtc_update_min_bt_rssi(s8 bt_rssi)
 {
 	struct btc_coexist *btcoexist = &gl_bt_coexist;
 
diff --git a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.h b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.h
index 3cbe34c535ec..3d308ebbe048 100644
--- a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.h
+++ b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.h
@@ -433,7 +433,7 @@ struct btc_stack_info {
 	u8 num_of_hid;
 	bool pan_exist;
 	bool unknown_acl_exist;
-	char min_bt_rssi;
+	s8 min_bt_rssi;
 };
 
 struct btc_statistics {
@@ -537,7 +537,7 @@ void exhalbtc_dbg_control(struct btc_coexist *btcoexist, u8 code, u8 len,
 void exhalbtc_stack_update_profile_info(void);
 void exhalbtc_set_hci_version(u16 hci_version);
 void exhalbtc_set_bt_patch_version(u16 bt_hci_version, u16 bt_patch_version);
-void exhalbtc_update_min_bt_rssi(char bt_rssi);
+void exhalbtc_update_min_bt_rssi(s8 bt_rssi);
 void exhalbtc_set_bt_exist(bool bt_exist);
 void exhalbtc_set_chip_type(u8 chip_type);
 void exhalbtc_set_ant_num(struct rtl_priv *rtlpriv, u8 type, u8 ant_num);
diff --git a/drivers/net/wireless/realtek/rtlwifi/rc.c b/drivers/net/wireless/realtek/rtlwifi/rc.c
index 1aca77719521..ce8621a0f7aa 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rc.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rc.c
@@ -94,7 +94,7 @@ static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
 				    struct ieee80211_sta *sta,
 				    struct ieee80211_tx_rate *rate,
 				    struct ieee80211_tx_rate_control *txrc,
-				    u8 tries, char rix, int rtsctsenable,
+				    u8 tries, s8 rix, int rtsctsenable,
 				    bool not_data)
 {
 	struct rtl_mac *mac = rtl_mac(rtlpriv);
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/dm.c b/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/dm.c
index db9a7829d568..6e7b673ae898 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/dm.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/dm.c
@@ -886,7 +886,7 @@ static void dm_txpower_track_cb_therm(struct ieee80211_hw *hw)
 	u8 thermalvalue_avg_count = 0;
 	u32 thermalvalue_avg = 0;
 	long  ele_d, temp_cck;
-	char ofdm_index[2], cck_index = 0,
+	s8 ofdm_index[2], cck_index = 0,
 		ofdm_index_old[2] = {0, 0}, cck_index_old = 0;
 	int i = 0;
 	/*bool is2t = false;*/
@@ -898,7 +898,7 @@ static void dm_txpower_track_cb_therm(struct ieee80211_hw *hw)
 	/*0.1 the following TWO tables decide the
 	 *final index of OFDM/CCK swing table
 	 */
-	char delta_swing_table_idx[2][15]  = {
+	s8 delta_swing_table_idx[2][15]  = {
 		{0, 0, 2, 3, 4, 4, 5, 6, 7, 7, 8, 9, 10, 10, 11},
 		{0, 0, -1, -2, -3, -4, -4, -4, -4, -5, -7, -8, -9, -9, -10}
 	};
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/trx.c
index 11701064b0e1..1016ad433813 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/trx.c
@@ -59,7 +59,7 @@ static void _rtl88ee_query_rxphystatus(struct ieee80211_hw *hw,
 	struct phy_status_rpt *phystrpt =
 		(struct phy_status_rpt *)p_drvinfo;
 	struct rtl_dm *rtldm = rtl_dm(rtl_priv(hw));
-	char rx_pwr_all = 0, rx_pwr[4];
+	s8 rx_pwr_all = 0, rx_pwr[4];
 	u8 rf_rx_num = 0, evm, pwdb_all;
 	u8 i, max_spatial_stream;
 	u32 rssi, total_rssi = 0;
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/trx.h b/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/trx.h
index 5a24d194ac76..9a1c2087adee 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/trx.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/trx.h
@@ -593,8 +593,8 @@ struct rx_fwinfo_88e {
 	u8 pwdb_all;
 	u8 cfosho[4];
 	u8 cfotail[4];
-	char rxevm[2];
-	char rxsnr[4];
+	s8 rxevm[2];
+	s8 rxsnr[4];
 	u8 pdsnr[2];
 	u8 csi_current[2];
 	u8 csi_target[2];
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192c/dm_common.h b/drivers/net/wireless/realtek/rtlwifi/rtl8192c/dm_common.h
index 4422e31fedd9..6a72d0c8afa0 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192c/dm_common.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192c/dm_common.h
@@ -135,7 +135,7 @@ void rtl92c_dm_init_edca_turbo(struct ieee80211_hw *hw);
 void rtl92c_dm_check_txpower_tracking(struct ieee80211_hw *hw);
 void rtl92c_dm_init_rate_adaptive_mask(struct ieee80211_hw *hw);
 void rtl92c_dm_rf_saving(struct ieee80211_hw *hw, u8 bforce_in_normal);
-void rtl92c_phy_ap_calibrate(struct ieee80211_hw *hw, char delta);
+void rtl92c_phy_ap_calibrate(struct ieee80211_hw *hw, s8 delta);
 void rtl92c_phy_lc_calibrate(struct ieee80211_hw *hw);
 void rtl92c_phy_iq_calibrate(struct ieee80211_hw *hw, bool recovery);
 void rtl92c_dm_dynamic_txpower(struct ieee80211_hw *hw);
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192c/phy_common.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192c/phy_common.c
index 77e61b19bf36..24162e055c25 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192c/phy_common.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192c/phy_common.c
@@ -1353,7 +1353,7 @@ static void _rtl92c_phy_iq_calibrate(struct ieee80211_hw *hw,
 }
 
 static void _rtl92c_phy_ap_calibrate(struct ieee80211_hw *hw,
-				     char delta, bool is2t)
+				     s8 delta, bool is2t)
 {
 }
 
@@ -1518,7 +1518,7 @@ void rtl92c_phy_lc_calibrate(struct ieee80211_hw *hw)
 }
 EXPORT_SYMBOL(rtl92c_phy_lc_calibrate);
 
-void rtl92c_phy_ap_calibrate(struct ieee80211_hw *hw, char delta)
+void rtl92c_phy_ap_calibrate(struct ieee80211_hw *hw, s8 delta)
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct rtl_phy *rtlphy = &(rtlpriv->phy);
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192c/phy_common.h b/drivers/net/wireless/realtek/rtlwifi/rtl8192c/phy_common.h
index 64bc49f4dbc6..202412577bf0 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192c/phy_common.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192c/phy_common.h
@@ -210,7 +210,7 @@ u8 rtl92c_phy_sw_chnl(struct ieee80211_hw *hw);
 void rtl92c_phy_iq_calibrate(struct ieee80211_hw *hw, bool b_recovery);
 void rtl92c_phy_set_beacon_hw_reg(struct ieee80211_hw *hw,
 					 u16 beaconinterval);
-void rtl92c_phy_ap_calibrate(struct ieee80211_hw *hw, char delta);
+void rtl92c_phy_ap_calibrate(struct ieee80211_hw *hw, s8 delta);
 void rtl92c_phy_lc_calibrate(struct ieee80211_hw *hw);
 void rtl92c_phy_set_rfpath_switch(struct ieee80211_hw *hw, bool bmain);
 bool rtl92c_phy_config_rf_with_headerfile(struct ieee80211_hw *hw,
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/phy.h b/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/phy.h
index e5e1353a94c3..dadc02b5de0b 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/phy.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/phy.h
@@ -102,7 +102,7 @@ void rtl92c_phy_sw_chnl_callback(struct ieee80211_hw *hw);
 u8 rtl92c_phy_sw_chnl(struct ieee80211_hw *hw);
 void rtl92c_phy_iq_calibrate(struct ieee80211_hw *hw, bool b_recovery);
 void rtl92c_phy_set_beacon_hw_reg(struct ieee80211_hw *hw, u16 beaconinterval);
-void rtl92c_phy_ap_calibrate(struct ieee80211_hw *hw, char delta);
+void rtl92c_phy_ap_calibrate(struct ieee80211_hw *hw, s8 delta);
 void rtl92c_phy_lc_calibrate(struct ieee80211_hw *hw);
 void _rtl92ce_phy_lc_calibrate(struct ieee80211_hw *hw, bool is2t);
 void rtl92c_phy_set_rfpath_switch(struct ieee80211_hw *hw, bool bmain);
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/trx.c
index 84ddd4d07a1d..93d3fba4f603 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/trx.c
@@ -49,7 +49,7 @@ static u8 _rtl92ce_map_hwqueue_to_fwqueue(struct sk_buff *skb, u8 hw_queue)
 	return skb->priority;
 }
 
-static u8 _rtl92c_query_rxpwrpercentage(char antpower)
+static u8 _rtl92c_query_rxpwrpercentage(s8 antpower)
 {
 	if ((antpower <= -100) || (antpower >= 20))
 		return 0;
@@ -59,9 +59,9 @@ static u8 _rtl92c_query_rxpwrpercentage(char antpower)
 		return 100 + antpower;
 }
 
-static u8 _rtl92c_evm_db_to_percentage(char value)
+static u8 _rtl92c_evm_db_to_percentage(s8 value)
 {
-	char ret_val;
+	s8 ret_val;
 	ret_val = value;
 
 	if (ret_val >= 0)
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/trx.h b/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/trx.h
index 4bec4b07e3e0..607304586c03 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/trx.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/trx.h
@@ -537,8 +537,8 @@ struct rx_fwinfo_92c {
 	u8 pwdb_all;
 	u8 cfosho[4];
 	u8 cfotail[4];
-	char rxevm[2];
-	char rxsnr[4];
+	s8 rxevm[2];
+	s8 rxsnr[4];
 	u8 pdsnr[2];
 	u8 csi_current[2];
 	u8 csi_target[2];
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/mac.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/mac.c
index 035713311a4a..68ca734853c1 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/mac.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/mac.c
@@ -596,7 +596,7 @@ void rtl92c_set_min_space(struct ieee80211_hw *hw, bool is2T)
 
 /*==============================================================*/
 
-static u8 _rtl92c_query_rxpwrpercentage(char antpower)
+static u8 _rtl92c_query_rxpwrpercentage(s8 antpower)
 {
 	if ((antpower <= -100) || (antpower >= 20))
 		return 0;
@@ -606,9 +606,9 @@ static u8 _rtl92c_query_rxpwrpercentage(char antpower)
 		return 100 + antpower;
 }
 
-static u8 _rtl92c_evm_db_to_percentage(char value)
+static u8 _rtl92c_evm_db_to_percentage(s8 value)
 {
-	char ret_val;
+	s8 ret_val;
 
 	ret_val = value;
 	if (ret_val >= 0)
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/mac.h b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/mac.h
index 553a4bfac668..20a49ec8459b 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/mac.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/mac.h
@@ -79,8 +79,8 @@ struct rx_fwinfo_92c {
 	u8 pwdb_all;
 	u8 cfosho[4];
 	u8 cfotail[4];
-	char rxevm[2];
-	char rxsnr[4];
+	s8 rxevm[2];
+	s8 rxsnr[4];
 	u8 pdsnr[2];
 	u8 csi_current[2];
 	u8 csi_target[2];
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
index 7810fe87dca7..d334d2a5ea63 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
@@ -2695,7 +2695,7 @@ void rtl92d_phy_lc_calibrate(struct ieee80211_hw *hw)
 	RTPRINT(rtlpriv, FINIT, INIT_IQK,  "LCK:Finish!!!\n");
 }
 
-void rtl92d_phy_ap_calibrate(struct ieee80211_hw *hw, char delta)
+void rtl92d_phy_ap_calibrate(struct ieee80211_hw *hw, s8 delta)
 {
 	return;
 }
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.h b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.h
index 48d5c6835b6a..8115bf4ac683 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.h
@@ -160,7 +160,7 @@ void rtl92d_phy_config_maccoexist_rfpage(struct ieee80211_hw *hw);
 bool rtl92d_phy_check_poweroff(struct ieee80211_hw *hw);
 void rtl92d_phy_lc_calibrate(struct ieee80211_hw *hw);
 void rtl92d_update_bbrf_configuration(struct ieee80211_hw *hw);
-void rtl92d_phy_ap_calibrate(struct ieee80211_hw *hw, char delta);
+void rtl92d_phy_ap_calibrate(struct ieee80211_hw *hw, s8 delta);
 void rtl92d_phy_iq_calibrate(struct ieee80211_hw *hw);
 void rtl92d_phy_reset_iqk_result(struct ieee80211_hw *hw);
 void rtl92d_release_cckandrw_pagea_ctl(struct ieee80211_hw *hw,
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.c
index 1feaa629dd4f..274b0e42ef41 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.c
@@ -48,7 +48,7 @@ static u8 _rtl92de_map_hwqueue_to_fwqueue(struct sk_buff *skb, u8 hw_queue)
 	return skb->priority;
 }
 
-static u8 _rtl92d_query_rxpwrpercentage(char antpower)
+static u8 _rtl92d_query_rxpwrpercentage(s8 antpower)
 {
 	if ((antpower <= -100) || (antpower >= 20))
 		return 0;
@@ -58,9 +58,9 @@ static u8 _rtl92d_query_rxpwrpercentage(char antpower)
 		return 100 + antpower;
 }
 
-static u8 _rtl92d_evm_db_to_percentage(char value)
+static u8 _rtl92d_evm_db_to_percentage(s8 value)
 {
-	char ret_val = value;
+	s8 ret_val = value;
 
 	if (ret_val >= 0)
 		ret_val = 0;
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.h b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.h
index fb5cf0634e8d..194d99f8bacf 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.h
@@ -554,8 +554,8 @@ struct rx_fwinfo_92d {
 	u8 pwdb_all;
 	u8 cfosho[4];
 	u8 cfotail[4];
-	char rxevm[2];
-	char rxsnr[4];
+	s8 rxevm[2];
+	s8 rxsnr[4];
 	u8 pdsnr[2];
 	u8 csi_current[2];
 	u8 csi_target[2];
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/phy.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/phy.c
index 018340aedf09..4e077de97541 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/phy.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/phy.c
@@ -547,7 +547,7 @@ static void _rtl92ee_phy_store_txpower_by_rate_base(struct ieee80211_hw *hw)
 static void _phy_convert_txpower_dbm_to_relative_value(u32 *data, u8 start,
 						       u8 end, u8 base)
 {
-	char i = 0;
+	s8 i = 0;
 	u8 tmp = 0;
 	u32 temp_data = 0;
 
@@ -1189,7 +1189,7 @@ static u8 _rtl92ee_get_txpower_by_rate(struct ieee80211_hw *hw,
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct rtl_phy *rtlphy = &rtlpriv->phy;
 	u8 shift = 0, sec, tx_num;
-	char diff = 0;
+	s8 diff = 0;
 
 	sec = _rtl92ee_phy_get_ratesection_intxpower_byrate(rf, rate);
 	tx_num = RF_TX_NUM_NONIMPLEMENT;
@@ -1265,14 +1265,14 @@ static u8 _rtl92ee_get_txpower_index(struct ieee80211_hw *hw,
 			 "Illegal channel!!\n");
 	}
 
-	if (IS_CCK_RATE(rate))
+	if (IS_CCK_RATE((s8)rate))
 		tx_power = rtlefuse->txpwrlevel_cck[rfpath][index];
 	else if (DESC92C_RATE6M <= rate)
 		tx_power = rtlefuse->txpwrlevel_ht40_1s[rfpath][index];
 
 	/* OFDM-1T*/
 	if (DESC92C_RATE6M <= rate && rate <= DESC92C_RATE54M &&
-	    !IS_CCK_RATE(rate))
+	    !IS_CCK_RATE((s8)rate))
 		tx_power += rtlefuse->txpwr_legacyhtdiff[rfpath][TX_1S];
 
 	/* BW20-1S, BW20-2S */
@@ -2978,7 +2978,7 @@ void rtl92ee_phy_lc_calibrate(struct ieee80211_hw *hw)
 	rtlphy->lck_inprogress = false;
 }
 
-void rtl92ee_phy_ap_calibrate(struct ieee80211_hw *hw, char delta)
+void rtl92ee_phy_ap_calibrate(struct ieee80211_hw *hw, s8 delta)
 {
 }
 
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/phy.h b/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/phy.h
index c6e97c8df54c..49bd0e554c65 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/phy.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/phy.h
@@ -141,7 +141,7 @@ void rtl92ee_phy_set_bw_mode(struct ieee80211_hw *hw,
 void rtl92ee_phy_sw_chnl_callback(struct ieee80211_hw *hw);
 u8 rtl92ee_phy_sw_chnl(struct ieee80211_hw *hw);
 void rtl92ee_phy_iq_calibrate(struct ieee80211_hw *hw, bool b_recovery);
-void rtl92ee_phy_ap_calibrate(struct ieee80211_hw *hw, char delta);
+void rtl92ee_phy_ap_calibrate(struct ieee80211_hw *hw, s8 delta);
 void rtl92ee_phy_lc_calibrate(struct ieee80211_hw *hw);
 void rtl92ee_phy_set_rfpath_switch(struct ieee80211_hw *hw, bool bmain);
 bool rtl92ee_phy_config_rf_with_headerfile(struct ieee80211_hw *hw,
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c
index 35e6bf7e233d..582b1fa7f3c5 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c
@@ -56,7 +56,7 @@ static void _rtl92ee_query_rxphystatus(struct ieee80211_hw *hw,
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct phy_status_rpt *p_phystrpt = (struct phy_status_rpt *)p_drvinfo;
-	char rx_pwr_all = 0, rx_pwr[4];
+	s8 rx_pwr_all = 0, rx_pwr[4];
 	u8 rf_rx_num = 0, evm, pwdb_all;
 	u8 i, max_spatial_stream;
 	u32 rssi, total_rssi = 0;
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.h b/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.h
index a4c38345233e..8053d1b12ec4 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.h
@@ -650,8 +650,8 @@ struct rx_fwinfo {
 	u8 pwdb_all;
 	u8 cfosho[4];
 	u8 cfotail[4];
-	char rxevm[2];
-	char rxsnr[4];
+	s8 rxevm[2];
+	s8 rxsnr[4];
 	u8 pdsnr[2];
 	u8 csi_current[2];
 	u8 csi_target[2];
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192se/rf.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192se/rf.c
index 9475aa2a8fa0..34e88a3f6abe 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192se/rf.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192se/rf.c
@@ -137,7 +137,7 @@ static void _rtl92s_set_antennadiff(struct ieee80211_hw *hw,
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct rtl_efuse *rtlefuse = rtl_efuse(rtl_priv(hw));
 	struct rtl_phy *rtlphy = &(rtlpriv->phy);
-	char ant_pwr_diff = 0;
+	s8 ant_pwr_diff = 0;
 	u32	u4reg_val = 0;
 
 	if (rtlphy->rf_type == RF_2T2R) {
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8723ae/trx.h b/drivers/net/wireless/realtek/rtlwifi/rtl8723ae/trx.h
index 32970bf18856..43d4c791d563 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8723ae/trx.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8723ae/trx.h
@@ -522,8 +522,8 @@ struct rx_fwinfo_8723e {
 	u8 pwdb_all;
 	u8 cfosho[4];
 	u8 cfotail[4];
-	char rxevm[2];
-	char rxsnr[4];
+	s8 rxevm[2];
+	s8 rxsnr[4];
 	u8 pdsnr[2];
 	u8 csi_current[2];
 	u8 csi_target[2];
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/dm.c b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/dm.c
index 3a81cdba8ca3..6f07cd60c7ad 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/dm.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/dm.c
@@ -758,11 +758,11 @@ static void rtl8723be_dm_txpower_tracking_callback_thermalmeter(
 	u8 ofdm_min_index = 6;
 	u8 index_for_channel = 0;
 
-	char delta_swing_table_idx_tup_a[TXSCALE_TABLE_SIZE] = {
+	s8 delta_swing_table_idx_tup_a[TXSCALE_TABLE_SIZE] = {
 		0, 0, 1, 2, 2, 2, 3, 3, 3, 4,  5,
 		5, 6, 6, 7, 7, 8, 8, 9, 9, 9, 10,
 		10, 11, 11, 12, 12, 13, 14, 15};
-	char delta_swing_table_idx_tdown_a[TXSCALE_TABLE_SIZE] = {
+	s8 delta_swing_table_idx_tdown_a[TXSCALE_TABLE_SIZE] = {
 		0, 0, 1, 2, 2, 2, 3, 3, 3, 4,  5,
 		5, 6, 6, 6, 6, 7, 7, 7, 8, 8,  9,
 		9, 10, 10, 11, 12, 13, 14, 15};
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/phy.c b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/phy.c
index 445f681d08c0..c79cb9717d51 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/phy.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/phy.c
@@ -379,7 +379,7 @@ static void _rtl8723be_phy_store_txpower_by_rate_base(struct ieee80211_hw *hw)
 static void _phy_convert_txpower_dbm_to_relative_value(u32 *data, u8 start,
 						u8 end, u8 base_val)
 {
-	char i = 0;
+	s8 i = 0;
 	u8 temp_value = 0;
 	u32 temp_data = 0;
 
@@ -953,7 +953,7 @@ static u8 _rtl8723be_get_txpower_by_rate(struct ieee80211_hw *hw,
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct rtl_phy *rtlphy = &rtlpriv->phy;
 	u8 shift = 0, rate_section, tx_num;
-	char tx_pwr_diff = 0;
+	s8 tx_pwr_diff = 0;
 
 	rate_section = _rtl8723be_phy_get_ratesection_intxpower_byrate(rfpath,
 								       rate);
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/trx.c
index 60345975f9fd..e881ef8ab27b 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/trx.c
@@ -56,7 +56,7 @@ static void _rtl8723be_query_rxphystatus(struct ieee80211_hw *hw,
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct phy_status_rpt *p_phystrpt = (struct phy_status_rpt *)p_drvinfo;
-	char rx_pwr_all = 0, rx_pwr[4];
+	s8 rx_pwr_all = 0, rx_pwr[4];
 	u8 rf_rx_num = 0, evm, pwdb_all, pwdb_all_bt = 0;
 	u8 i, max_spatial_stream;
 	u32 rssi, total_rssi = 0;
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/trx.h b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/trx.h
index 40c36607b8b9..8a9fe41ac15b 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/trx.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/trx.h
@@ -385,9 +385,9 @@ struct phy_status_rpt {
 	u8 cck_rpt_b_ofdm_cfosho_b;
 	u8 rsvd_1;/* ch_corr_msb; */
 	u8 noise_power_db_msb;
-	char path_cfotail[2];
+	s8 path_cfotail[2];
 	u8 pcts_mask[2];
-	char stream_rxevm[2];
+	s8 stream_rxevm[2];
 	u8 path_rxsnr[2];
 	u8 noise_power_db_lsb;
 	u8 rsvd_2[3];
@@ -422,8 +422,8 @@ struct rx_fwinfo_8723be {
 	u8 pwdb_all;
 	u8 cfosho[4];
 	u8 cfotail[4];
-	char rxevm[2];
-	char rxsnr[2];
+	s8 rxevm[2];
+	s8 rxsnr[2];
 	u8 pcts_msk_rpt[2];
 	u8 pdsnr[2];
 	u8 csi_current[2];
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/dm.c b/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/dm.c
index 17a681788611..69de8353d0fe 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/dm.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/dm.c
@@ -1355,7 +1355,7 @@ void rtl8812ae_dm_txpwr_track_set_pwr(struct ieee80211_hw *hw,
 	u32 final_swing_idx[2];
 	u8 pwr_tracking_limit = 26; /*+1.0dB*/
 	u8 tx_rate = 0xFF;
-	char final_ofdm_swing_index = 0;
+	s8 final_ofdm_swing_index = 0;
 
 	if (rtldm->tx_rate != 0xFF)
 		tx_rate =
@@ -2045,7 +2045,7 @@ void rtl8821ae_dm_txpwr_track_set_pwr(struct ieee80211_hw *hw,
 	u32 final_swing_idx[1];
 	u8 pwr_tracking_limit = 26; /*+1.0dB*/
 	u8 tx_rate = 0xFF;
-	char final_ofdm_swing_index = 0;
+	s8 final_ofdm_swing_index = 0;
 
 	if (rtldm->tx_rate != 0xFF)
 		tx_rate = rtl8821ae_hw_rate_to_mrate(hw, rtldm->tx_rate);
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.c b/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.c
index 3d194eb59dff..b00a2e030feb 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.c
@@ -366,12 +366,12 @@ u32 phy_get_tx_swing_8812A(struct ieee80211_hw *hw, u8	band,
 	struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw));
 	struct rtl_dm *rtldm = rtl_dm(rtlpriv);
 	struct rtl_efuse *rtlefuse = rtl_efuse(rtl_priv(hw));
-	char reg_swing_2g = -1;/* 0xff; */
-	char reg_swing_5g = -1;/* 0xff; */
-	char swing_2g = -1 * reg_swing_2g;
-	char swing_5g = -1 * reg_swing_5g;
+	s8 reg_swing_2g = -1;/* 0xff; */
+	s8 reg_swing_5g = -1;/* 0xff; */
+	s8 swing_2g = -1 * reg_swing_2g;
+	s8 swing_5g = -1 * reg_swing_5g;
 	u32  out = 0x200;
-	const char auto_temp = -1;
+	const s8 auto_temp = -1;
 
 	RT_TRACE(rtlpriv, COMP_SCAN, DBG_LOUD,
 		 "===> PHY_GetTxBBSwing_8812A, bbSwing_2G: %d, bbSwing_5G: %d,autoload_failflag=%d.\n",
@@ -524,7 +524,7 @@ void rtl8821ae_phy_switch_wirelessband(struct ieee80211_hw *hw, u8 band)
 	struct rtl_dm *rtldm = rtl_dm(rtlpriv);
 	u8 current_band = rtlhal->current_bandtype;
 	u32 txpath, rxpath;
-	char bb_diff_between_band;
+	s8 bb_diff_between_band;
 
 	txpath = rtl8821ae_phy_query_bb_reg(hw, RTXPATH, 0xf0);
 	rxpath = rtl8821ae_phy_query_bb_reg(hw, RCCK_RX, 0x0f000000);
@@ -986,7 +986,7 @@ static void _rtl8812ae_phy_cross_reference_ht_and_vht_txpower_limit(struct ieee8
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct rtl_phy *rtlphy = &rtlpriv->phy;
 	u8 regulation, bw, channel, rate_section;
-	char temp_pwrlmt = 0;
+	s8 temp_pwrlmt = 0;
 
 	for (regulation = 0; regulation < MAX_REGULATION_NUM; ++regulation) {
 		for (bw = 0; bw < MAX_5G_BANDWITH_NUM; ++bw) {
@@ -1155,7 +1155,7 @@ static void _rtl8812ae_phy_convert_txpower_limit_to_power_index(struct ieee80211
 	u8 regulation, bw, channel, rate_section;
 	u8 base_index2_4G = 0;
 	u8 base_index5G = 0;
-	char temp_value = 0, temp_pwrlmt = 0;
+	s8 temp_value = 0, temp_pwrlmt = 0;
 	u8 rf_path = 0;
 
 	RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
@@ -1467,11 +1467,11 @@ static bool _rtl8812ae_eq_n_byte(u8 *str1, u8 *str2, u32 num)
 	return true;
 }
 
-static char _rtl8812ae_phy_get_chnl_idx_of_txpwr_lmt(struct ieee80211_hw *hw,
+static s8 _rtl8812ae_phy_get_chnl_idx_of_txpwr_lmt(struct ieee80211_hw *hw,
 					      u8 band, u8 channel)
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
-	char channel_index = -1;
+	s8 channel_index = -1;
 	u8  i = 0;
 
 	if (band == BAND_ON_2_4G)
@@ -1502,7 +1502,7 @@ static void _rtl8812ae_phy_set_txpower_limit(struct ieee80211_hw *hw, u8 *pregul
 	struct rtl_phy *rtlphy = &rtlpriv->phy;
 	u8 regulation = 0, bandwidth = 0, rate_section = 0, channel;
 	u8 channel_index;
-	char power_limit = 0, prev_power_limit, ret;
+	s8 power_limit = 0, prev_power_limit, ret;
 
 	if (!_rtl8812ae_get_integer_from_string((char *)pchannel, &channel) ||
 	    !_rtl8812ae_get_integer_from_string((char *)ppower_limit,
@@ -2254,9 +2254,9 @@ static bool _rtl8821ae_phy_get_chnl_index(u8 channel, u8 *chnl_index)
 	return in_24g;
 }
 
-static char _rtl8821ae_phy_get_ratesection_intxpower_byrate(u8 path, u8 rate)
+static s8 _rtl8821ae_phy_get_ratesection_intxpower_byrate(u8 path, u8 rate)
 {
-	char rate_section = 0;
+	s8 rate_section = 0;
 	switch (rate) {
 	case DESC_RATE1M:
 	case DESC_RATE2M:
@@ -2338,9 +2338,9 @@ static char _rtl8821ae_phy_get_ratesection_intxpower_byrate(u8 path, u8 rate)
 	return rate_section;
 }
 
-static char _rtl8812ae_phy_get_world_wide_limit(char  *limit_table)
+static s8 _rtl8812ae_phy_get_world_wide_limit(s8  *limit_table)
 {
-	char min = limit_table[0];
+	s8 min = limit_table[0];
 	u8 i = 0;
 
 	for (i = 0; i < MAX_REGULATION_NUM; ++i) {
@@ -2350,7 +2350,7 @@ static char _rtl8812ae_phy_get_world_wide_limit(char  *limit_table)
 	return min;
 }
 
-static char _rtl8812ae_phy_get_txpower_limit(struct ieee80211_hw *hw,
+static s8 _rtl8812ae_phy_get_txpower_limit(struct ieee80211_hw *hw,
 					     u8 band,
 					     enum ht_channel_width bandwidth,
 					     enum radio_path rf_path,
@@ -2362,7 +2362,7 @@ static char _rtl8812ae_phy_get_txpower_limit(struct ieee80211_hw *hw,
 	short band_temp = -1, regulation = -1, bandwidth_temp = -1,
 		 rate_section = -1, channel_temp = -1;
 	u16 bd, regu, bdwidth, sec, chnl;
-	char power_limit = MAX_POWER_INDEX;
+	s8 power_limit = MAX_POWER_INDEX;
 
 	if (rtlefuse->eeprom_regulatory == 2)
 		return MAX_POWER_INDEX;
@@ -2490,7 +2490,7 @@ static char _rtl8812ae_phy_get_txpower_limit(struct ieee80211_hw *hw,
 	chnl = channel_temp;
 
 	if (band == BAND_ON_2_4G) {
-		char limits[10] = {0};
+		s8 limits[10] = {0};
 		u8 i;
 
 		for (i = 0; i < 4; ++i)
@@ -2502,7 +2502,7 @@ static char _rtl8812ae_phy_get_txpower_limit(struct ieee80211_hw *hw,
 			rtlphy->txpwr_limit_2_4g[regu][bdwidth]
 					[sec][chnl][rf_path];
 	} else if (band == BAND_ON_5G) {
-		char limits[10] = {0};
+		s8 limits[10] = {0};
 		u8 i;
 
 		for (i = 0; i < MAX_REGULATION_NUM; ++i)
@@ -2520,14 +2520,14 @@ static char _rtl8812ae_phy_get_txpower_limit(struct ieee80211_hw *hw,
 	return power_limit;
 }
 
-static char _rtl8821ae_phy_get_txpower_by_rate(struct ieee80211_hw *hw,
+static s8 _rtl8821ae_phy_get_txpower_by_rate(struct ieee80211_hw *hw,
 					u8 band, u8 path, u8 rate)
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct rtl_phy *rtlphy = &rtlpriv->phy;
 	u8 shift = 0, rate_section, tx_num;
-	char tx_pwr_diff = 0;
-	char limit = 0;
+	s8 tx_pwr_diff = 0;
+	s8 limit = 0;
 
 	rate_section = _rtl8821ae_phy_get_ratesection_intxpower_byrate(path, rate);
 	tx_num = RF_TX_NUM_NONIMPLEMENT;
@@ -2640,7 +2640,7 @@ static u8 _rtl8821ae_get_txpower_index(struct ieee80211_hw *hw, u8 path,
 	u8 index = (channel - 1);
 	u8 txpower = 0;
 	bool in_24g = false;
-	char powerdiff_byrate = 0;
+	s8 powerdiff_byrate = 0;
 
 	if (((rtlhal->current_bandtype == BAND_ON_2_4G) &&
 	    (channel > 14 || channel < 1)) ||
@@ -4638,7 +4638,7 @@ void rtl8821ae_phy_lc_calibrate(struct ieee80211_hw *hw)
 {
 }
 
-void rtl8821ae_phy_ap_calibrate(struct ieee80211_hw *hw, char delta)
+void rtl8821ae_phy_ap_calibrate(struct ieee80211_hw *hw, s8 delta)
 {
 }
 
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.h b/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.h
index c411f0a95cc4..1285e1adfe9d 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.h
@@ -236,7 +236,7 @@ void rtl8821ae_phy_iq_calibrate(struct ieee80211_hw *hw,
 				bool b_recovery);
 void rtl8812ae_phy_iq_calibrate(struct ieee80211_hw *hw,
 				bool b_recovery);
-void rtl8821ae_phy_ap_calibrate(struct ieee80211_hw *hw, char delta);
+void rtl8821ae_phy_ap_calibrate(struct ieee80211_hw *hw, s8 delta);
 void rtl8821ae_phy_lc_calibrate(struct ieee80211_hw *hw);
 void rtl8821ae_phy_set_rfpath_switch(struct ieee80211_hw *hw, bool bmain);
 bool rtl8812ae_phy_config_rf_with_headerfile(struct ieee80211_hw *hw,
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/trx.c
index 41efaa148d13..8c2a5e21308e 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/trx.c
@@ -48,7 +48,7 @@ static u8 _rtl8821ae_map_hwqueue_to_fwqueue(struct sk_buff *skb, u8 hw_queue)
 	return skb->priority;
 }
 
-static u16 odm_cfo(char value)
+static u16 odm_cfo(s8 value)
 {
 	int ret_val;
 
@@ -64,9 +64,9 @@ static u16 odm_cfo(char value)
 	return ret_val;
 }
 
-static u8 _rtl8821ae_evm_dbm_jaguar(char value)
+static u8 _rtl8821ae_evm_dbm_jaguar(s8 value)
 {
-	char ret_val = value;
+	s8 ret_val = value;
 
 	/* -33dB~0dB to 33dB ~ 0dB*/
 	if (ret_val == -128)
@@ -88,7 +88,7 @@ static void query_rxphystatus(struct ieee80211_hw *hw,
 	struct phy_status_rpt *p_phystrpt = (struct phy_status_rpt *)p_drvinfo;
 	struct rtl_dm *rtldm = rtl_dm(rtl_priv(hw));
 	struct rtl_phy *rtlphy = &rtlpriv->phy;
-	char rx_pwr_all = 0, rx_pwr[4];
+	s8 rx_pwr_all = 0, rx_pwr[4];
 	u8 rf_rx_num = 0, evm, evmdbm, pwdb_all;
 	u8 i, max_spatial_stream;
 	u32 rssi, total_rssi = 0;
@@ -170,7 +170,7 @@ static void query_rxphystatus(struct ieee80211_hw *hw,
 					pwdb_all = 100;
 			}
 		} else { /* 8821 */
-			char pout = -6;
+			s8 pout = -6;
 
 			switch (lan_idx) {
 			case 5:
@@ -275,7 +275,7 @@ static void query_rxphystatus(struct ieee80211_hw *hw,
 		if (bpacket_match_bssid) {
 			for (i = RF90_PATH_A; i <= RF90_PATH_B; i++)
 				rtl_priv(hw)->dm.cfo_tail[i] =
-					(char)p_phystrpt->cfotail[i];
+					(s8)p_phystrpt->cfotail[i];
 
 			rtl_priv(hw)->dm.packet_count++;
 		}
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/trx.h b/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/trx.h
index ad565bebf1d5..b6f3c564b8d1 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/trx.h
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/trx.h
@@ -390,11 +390,11 @@ struct phy_status_rpt {
 	u8 cfosho[4];	/* DW 1 byte 1 DW 2 byte 0 */
 
 	/* DWORD 2 */
-	char cfotail[4];	/* DW 2 byte 1 DW 3 byte 0 */
+	s8 cfotail[4];	/* DW 2 byte 1 DW 3 byte 0 */
 
 	/* DWORD 3 */
-	char rxevm[2];	/* DW 3 byte 1 DW 3 byte 2 */
-	char rxsnr[2];	/* DW 3 byte 3 DW 4 byte 0 */
+	s8 rxevm[2];	/* DW 3 byte 1 DW 3 byte 2 */
+	s8 rxsnr[2];	/* DW 3 byte 3 DW 4 byte 0 */
 
 	/* DWORD 4 */
 	u8 pcts_msk_rpt[2];
@@ -418,8 +418,8 @@ struct rx_fwinfo_8821ae {
 	u8 pwdb_all;
 	u8 cfosho[4];
 	u8 cfotail[4];
-	char rxevm[2];
-	char rxsnr[4];
+	s8 rxevm[2];
+	s8 rxsnr[4];
 	u8 pdsnr[2];
 	u8 csi_current[2];
 	u8 csi_target[2];
diff --git a/drivers/net/wireless/realtek/rtlwifi/stats.c b/drivers/net/wireless/realtek/rtlwifi/stats.c
index d8b30690b00d..61700fa05570 100644
--- a/drivers/net/wireless/realtek/rtlwifi/stats.c
+++ b/drivers/net/wireless/realtek/rtlwifi/stats.c
@@ -26,7 +26,7 @@
 #include "stats.h"
 #include <linux/export.h>
 
-u8 rtl_query_rxpwrpercentage(char antpower)
+u8 rtl_query_rxpwrpercentage(s8 antpower)
 {
 	if ((antpower <= -100) || (antpower >= 20))
 		return 0;
@@ -37,9 +37,9 @@ u8 rtl_query_rxpwrpercentage(char antpower)
 }
 EXPORT_SYMBOL(rtl_query_rxpwrpercentage);
 
-u8 rtl_evm_db_to_percentage(char value)
+u8 rtl_evm_db_to_percentage(s8 value)
 {
-	char ret_val = clamp(-value, 0, 33) * 3;
+	s8 ret_val = clamp(-value, 0, 33) * 3;
 
 	if (ret_val == 99)
 		ret_val = 100;
diff --git a/drivers/net/wireless/realtek/rtlwifi/stats.h b/drivers/net/wireless/realtek/rtlwifi/stats.h
index 2b57dffef572..bd0108f93182 100644
--- a/drivers/net/wireless/realtek/rtlwifi/stats.h
+++ b/drivers/net/wireless/realtek/rtlwifi/stats.h
@@ -33,8 +33,8 @@
 /* Rx smooth factor */
 #define	RX_SMOOTH_FACTOR			20
 
-u8 rtl_query_rxpwrpercentage(char antpower);
-u8 rtl_evm_db_to_percentage(char value);
+u8 rtl_query_rxpwrpercentage(s8 antpower);
+u8 rtl_evm_db_to_percentage(s8 value);
 long rtl_signal_scale_mapping(struct ieee80211_hw *hw, long currsig);
 void rtl_process_phyinfo(struct ieee80211_hw *hw, u8 *buffer,
 			 struct rtl_stats *pstatus);
diff --git a/drivers/net/wireless/realtek/rtlwifi/wifi.h b/drivers/net/wireless/realtek/rtlwifi/wifi.h
index 4e0ab4d42aa6..c5086c2229aa 100644
--- a/drivers/net/wireless/realtek/rtlwifi/wifi.h
+++ b/drivers/net/wireless/realtek/rtlwifi/wifi.h
@@ -1089,7 +1089,7 @@ struct dynamic_primary_cca {
 };
 
 struct rtl_regulatory {
-	char alpha2[2];
+	s8 alpha2[2];
 	u16 country_code;
 	u16 max_power_level;
 	u32 tp_scale;
@@ -1256,16 +1256,16 @@ struct rtl_phy {
 	u8 cur_bw20_txpwridx;
 	u8 cur_bw40_txpwridx;
 
-	char txpwr_limit_2_4g[MAX_REGULATION_NUM]
-			     [MAX_2_4G_BANDWITH_NUM]
-			     [MAX_RATE_SECTION_NUM]
-			     [CHANNEL_MAX_NUMBER_2G]
-			     [MAX_RF_PATH_NUM];
-	char txpwr_limit_5g[MAX_REGULATION_NUM]
-			   [MAX_5G_BANDWITH_NUM]
+	s8 txpwr_limit_2_4g[MAX_REGULATION_NUM]
+			   [MAX_2_4G_BANDWITH_NUM]
 			   [MAX_RATE_SECTION_NUM]
-			   [CHANNEL_MAX_NUMBER_5G]
+			   [CHANNEL_MAX_NUMBER_2G]
 			   [MAX_RF_PATH_NUM];
+	s8 txpwr_limit_5g[MAX_REGULATION_NUM]
+			 [MAX_5G_BANDWITH_NUM]
+			 [MAX_RATE_SECTION_NUM]
+			 [CHANNEL_MAX_NUMBER_5G]
+			 [MAX_RF_PATH_NUM];
 
 	u32 rfreg_chnlval[2];
 	bool apk_done;
@@ -1639,7 +1639,7 @@ struct fast_ant_training {
 };
 
 struct dm_phy_dbg_info {
-	char rx_snrdb[4];
+	s8 rx_snrdb[4];
 	u64 num_qry_phy_status;
 	u64 num_qry_phy_status_cck;
 	u64 num_qry_phy_status_ofdm;
@@ -1688,16 +1688,16 @@ struct rtl_dm {
 	u8 txpower_track_control;
 	bool interrupt_migration;
 	bool disable_tx_int;
-	char ofdm_index[MAX_RF_PATH];
+	s8 ofdm_index[MAX_RF_PATH];
 	u8 default_ofdm_index;
 	u8 default_cck_index;
-	char cck_index;
-	char delta_power_index[MAX_RF_PATH];
-	char delta_power_index_last[MAX_RF_PATH];
-	char power_index_offset[MAX_RF_PATH];
-	char absolute_ofdm_swing_idx[MAX_RF_PATH];
-	char remnant_ofdm_swing_idx[MAX_RF_PATH];
-	char remnant_cck_idx;
+	s8 cck_index;
+	s8 delta_power_index[MAX_RF_PATH];
+	s8 delta_power_index_last[MAX_RF_PATH];
+	s8 power_index_offset[MAX_RF_PATH];
+	s8 absolute_ofdm_swing_idx[MAX_RF_PATH];
+	s8 remnant_ofdm_swing_idx[MAX_RF_PATH];
+	s8 remnant_cck_idx;
 	bool modify_txagc_flag_path_a;
 	bool modify_txagc_flag_path_b;
 
@@ -1726,8 +1726,8 @@ struct rtl_dm {
 	u8	swing_idx_cck_base;
 	bool	swing_flag_cck;
 
-	char	swing_diff_2g;
-	char	swing_diff_5g;
+	s8	swing_diff_2g;
+	s8	swing_diff_5g;
 
 	u8 delta_swing_table_idx_24gccka_p[DEL_SW_IDX_SZ];
 	u8 delta_swing_table_idx_24gccka_n[DEL_SW_IDX_SZ];
@@ -1838,17 +1838,17 @@ struct rtl_efuse {
 	 *
 	 * Sizes of these arrays are decided by the larger ones.
 	 */
-	char txpwr_cckdiff[MAX_RF_PATH][CHANNEL_MAX_NUMBER];
-	char txpwr_ht20diff[MAX_RF_PATH][CHANNEL_MAX_NUMBER];
-	char txpwr_ht40diff[MAX_RF_PATH][CHANNEL_MAX_NUMBER];
-	char txpwr_legacyhtdiff[MAX_RF_PATH][CHANNEL_MAX_NUMBER];
+	s8 txpwr_cckdiff[MAX_RF_PATH][CHANNEL_MAX_NUMBER];
+	s8 txpwr_ht20diff[MAX_RF_PATH][CHANNEL_MAX_NUMBER];
+	s8 txpwr_ht40diff[MAX_RF_PATH][CHANNEL_MAX_NUMBER];
+	s8 txpwr_legacyhtdiff[MAX_RF_PATH][CHANNEL_MAX_NUMBER];
 
 	u8 txpwr_5g_bw40base[MAX_RF_PATH][CHANNEL_MAX_NUMBER];
 	u8 txpwr_5g_bw80base[MAX_RF_PATH][CHANNEL_MAX_NUMBER_5G_80M];
-	char txpwr_5g_ofdmdiff[MAX_RF_PATH][MAX_TX_COUNT];
-	char txpwr_5g_bw20diff[MAX_RF_PATH][MAX_TX_COUNT];
-	char txpwr_5g_bw40diff[MAX_RF_PATH][MAX_TX_COUNT];
-	char txpwr_5g_bw80diff[MAX_RF_PATH][MAX_TX_COUNT];
+	s8 txpwr_5g_ofdmdiff[MAX_RF_PATH][MAX_TX_COUNT];
+	s8 txpwr_5g_bw20diff[MAX_RF_PATH][MAX_TX_COUNT];
+	s8 txpwr_5g_bw40diff[MAX_RF_PATH][MAX_TX_COUNT];
+	s8 txpwr_5g_bw80diff[MAX_RF_PATH][MAX_TX_COUNT];
 
 	u8 txpwr_safetyflag;			/* Band edge enable flag */
 	u16 eeprom_txpowerdiff;
@@ -2006,7 +2006,7 @@ struct rtl_stats {
 	bool is_ht;
 	bool packet_toself;
 	bool packet_beacon;	/*for rssi */
-	char cck_adc_pwdb[4];	/*for rx path selection */
+	s8 cck_adc_pwdb[4];	/*for rx path selection */
 
 	bool is_vht;
 	bool is_short_gi;
@@ -2413,9 +2413,9 @@ struct dig_t {
 	u8 presta_cstate;
 	u8 curmultista_cstate;
 	u8 stop_dig;
-	char back_val;
-	char back_range_max;
-	char back_range_min;
+	s8 back_val;
+	s8 back_range_max;
+	s8 back_range_min;
 	u8 rx_gain_max;
 	u8 rx_gain_min;
 	u8 min_undec_pwdb_for_dm;
@@ -2441,8 +2441,8 @@ struct dig_t {
 	u8 cur_cs_ratiostate;
 	u8 pre_cs_ratiostate;
 	u8 backoff_enable_flag;
-	char backoffval_range_max;
-	char backoffval_range_min;
+	s8 backoffval_range_max;
+	s8 backoffval_range_min;
 	u8 dig_min_0;
 	u8 dig_min_1;
 	u8 bt30_cur_igi;
