From 2031f4725fab8be5092d483281e92c9cb7a7bc68 Mon Sep 17 00:00:00 2001
From: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Date: Sun, 26 Jan 2025 16:04:21 +0200
Subject: [PATCH 43/43] wifi: rtw88: Don't use static local variable in
 rtw8821c_set_tx_power_index_by_rate

Some users want to plug two identical USB devices at the same time.
This static variable could theoretically cause them to use incorrect
TX power values.

Move the variable to the caller and pass a pointer to it to
rtw8821c_set_tx_power_index_by_rate().

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/fe42858c-9b9f-4f03-9aaa-737472c2cd90@gmail.com
---
 drivers/net/wireless/realtek/rtw88/rtw8821c.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/rtw8821c.c b/drivers/net/wireless/realtek/rtw88/rtw8821c.c
index eb7e34c545d0..cc152248407c 100644
--- a/drivers/net/wireless/realtek/rtw88/rtw8821c.c
+++ b/drivers/net/wireless/realtek/rtw88/rtw8821c.c
@@ -680,11 +680,11 @@ static void query_phy_status(struct rtw_dev *rtwdev, u8 *phy_status,
 }
 
 static void
-rtw8821c_set_tx_power_index_by_rate(struct rtw_dev *rtwdev, u8 path, u8 rs)
+rtw8821c_set_tx_power_index_by_rate(struct rtw_dev *rtwdev, u8 path,
+				    u8 rs, u32 *phy_pwr_idx)
 {
 	struct rtw_hal *hal = &rtwdev->hal;
 	static const u32 offset_txagc[2] = {0x1d00, 0x1d80};
-	static u32 phy_pwr_idx;
 	u8 rate, rate_idx, pwr_index, shift;
 	int j;
 
@@ -692,12 +692,12 @@ rtw8821c_set_tx_power_index_by_rate(struct rtw_dev *rtwdev, u8 path, u8 rs)
 		rate = rtw_rate_section[rs][j];
 		pwr_index = hal->tx_pwr_tbl[path][rate];
 		shift = rate & 0x3;
-		phy_pwr_idx |= ((u32)pwr_index << (shift * 8));
+		*phy_pwr_idx |= ((u32)pwr_index << (shift * 8));
 		if (shift == 0x3 || rate == DESC_RATEVHT1SS_MCS9) {
 			rate_idx = rate & 0xfc;
 			rtw_write32(rtwdev, offset_txagc[path] + rate_idx,
-				    phy_pwr_idx);
-			phy_pwr_idx = 0;
+				    *phy_pwr_idx);
+			*phy_pwr_idx = 0;
 		}
 	}
 }
@@ -705,6 +705,7 @@ rtw8821c_set_tx_power_index_by_rate(struct rtw_dev *rtwdev, u8 path, u8 rs)
 static void rtw8821c_set_tx_power_index(struct rtw_dev *rtwdev)
 {
 	struct rtw_hal *hal = &rtwdev->hal;
+	u32 phy_pwr_idx = 0;
 	int rs, path;
 
 	for (path = 0; path < hal->rf_path_num; path++) {
@@ -712,7 +713,8 @@ static void rtw8821c_set_tx_power_index(struct rtw_dev *rtwdev)
 			if (rs == RTW_RATE_SECTION_HT_2S ||
 			    rs == RTW_RATE_SECTION_VHT_2S)
 				continue;
-			rtw8821c_set_tx_power_index_by_rate(rtwdev, path, rs);
+			rtw8821c_set_tx_power_index_by_rate(rtwdev, path, rs,
+							    &phy_pwr_idx);
 		}
 	}
 }
-- 
2.43.0

