immortalwrt/package/kernel/mac80211/patches/rtl/005-wifi-rtw88-Drop-rf_lock.patch

From 293a0c7587a4dbfa700e23bc93f80dd2ad40ed59 Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Fri, 2 Dec 2022 09:12:16 +0100
Subject: [PATCH 05/13] wifi: rtw88: Drop rf_lock

The rtwdev->rf_lock spinlock protects the rf register accesses in
rtw_read_rf() and rtw_write_rf(). Most callers of these functions hold
rtwdev->mutex already with the exception of the callsites in the debugfs
code. The debugfs code doesn't justify an extra lock, so acquire the mutex
there as well before calling rf register accessors and drop the now
unnecessary spinlock.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20221202081224.2779981-4-s.hauer@pengutronix.de
---
 drivers/net/wireless/realtek/rtw88/debug.c | 11 +++++++++++
 drivers/net/wireless/realtek/rtw88/hci.h   |  9 +++------
 drivers/net/wireless/realtek/rtw88/main.c  |  1 -
 drivers/net/wireless/realtek/rtw88/main.h  |  3 ---
 4 files changed, 14 insertions(+), 10 deletions(-)

--- a/drivers/net/wireless/realtek/rtw88/debug.c
+++ b/drivers/net/wireless/realtek/rtw88/debug.c
@@ -144,7 +144,9 @@ static int rtw_debugfs_get_rf_read(struc
 	addr = debugfs_priv->rf_addr;
 	mask = debugfs_priv->rf_mask;
 
+	mutex_lock(&rtwdev->mutex);
 	val = rtw_read_rf(rtwdev, path, addr, mask);
+	mutex_unlock(&rtwdev->mutex);
 
 	seq_printf(m, "rf_read path:%d addr:0x%08x mask:0x%08x val=0x%08x\n",
 		   path, addr, mask, val);
@@ -414,7 +416,9 @@ static ssize_t rtw_debugfs_set_rf_write(
 		return count;
 	}
 
+	mutex_lock(&rtwdev->mutex);
 	rtw_write_rf(rtwdev, path, addr, mask, val);
+	mutex_unlock(&rtwdev->mutex);
 	rtw_dbg(rtwdev, RTW_DBG_DEBUGFS,
 		"write_rf path:%d addr:0x%08x mask:0x%08x, val:0x%08x\n",
 		path, addr, mask, val);
@@ -519,6 +523,8 @@ static int rtw_debug_get_rf_dump(struct
 	u32 addr, offset, data;
 	u8 path;
 
+	mutex_lock(&rtwdev->mutex);
+
 	for (path = 0; path < rtwdev->hal.rf_path_num; path++) {
 		seq_printf(m, "RF path:%d\n", path);
 		for (addr = 0; addr < 0x100; addr += 4) {
@@ -533,6 +539,8 @@ static int rtw_debug_get_rf_dump(struct
 		seq_puts(m, "\n");
 	}
 
+	mutex_unlock(&rtwdev->mutex);
+
 	return 0;
 }
 
@@ -1026,6 +1034,8 @@ static void dump_gapk_status(struct rtw_
 		   dm_info->dm_flags & BIT(RTW_DM_CAP_TXGAPK) ? '-' : '+',
 		   rtw_dm_cap_strs[RTW_DM_CAP_TXGAPK]);
 
+	mutex_lock(&rtwdev->mutex);
+
 	for (path = 0; path < rtwdev->hal.rf_path_num; path++) {
 		val = rtw_read_rf(rtwdev, path, RF_GAINTX, RFREG_MASK);
 		seq_printf(m, "path %d:\n0x%x = 0x%x\n", path, RF_GAINTX, val);
@@ -1035,6 +1045,7 @@ static void dump_gapk_status(struct rtw_
 				   txgapk->rf3f_fs[path][i], i);
 		seq_puts(m, "\n");
 	}
+	mutex_unlock(&rtwdev->mutex);
 }
 
 static int rtw_debugfs_get_dm_cap(struct seq_file *m, void *v)
--- a/drivers/net/wireless/realtek/rtw88/hci.h
+++ b/drivers/net/wireless/realtek/rtw88/hci.h
@@ -166,12 +166,11 @@ static inline u32
 rtw_read_rf(struct rtw_dev *rtwdev, enum rtw_rf_path rf_path,
 	    u32 addr, u32 mask)
 {
-	unsigned long flags;
 	u32 val;
 
-	spin_lock_irqsave(&rtwdev->rf_lock, flags);
+	lockdep_assert_held(&rtwdev->mutex);
+
 	val = rtwdev->chip->ops->read_rf(rtwdev, rf_path, addr, mask);
-	spin_unlock_irqrestore(&rtwdev->rf_lock, flags);
 
 	return val;
 }
@@ -180,11 +179,9 @@ static inline void
 rtw_write_rf(struct rtw_dev *rtwdev, enum rtw_rf_path rf_path,
 	     u32 addr, u32 mask, u32 data)
 {
-	unsigned long flags;
+	lockdep_assert_held(&rtwdev->mutex);
 
-	spin_lock_irqsave(&rtwdev->rf_lock, flags);
 	rtwdev->chip->ops->write_rf(rtwdev, rf_path, addr, mask, data);
-	spin_unlock_irqrestore(&rtwdev->rf_lock, flags);
 }
 
 static inline u32
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -2080,7 +2080,6 @@ int rtw_core_init(struct rtw_dev *rtwdev
 	skb_queue_head_init(&rtwdev->coex.queue);
 	skb_queue_head_init(&rtwdev->tx_report.queue);
 
-	spin_lock_init(&rtwdev->rf_lock);
 	spin_lock_init(&rtwdev->h2c.lock);
 	spin_lock_init(&rtwdev->txq_lock);
 	spin_lock_init(&rtwdev->tx_report.q_lock);
--- a/drivers/net/wireless/realtek/rtw88/main.h
+++ b/drivers/net/wireless/realtek/rtw88/main.h
@@ -1998,9 +1998,6 @@ struct rtw_dev {
 	/* ensures exclusive access from mac80211 callbacks */
 	struct mutex mutex;
 
-	/* read/write rf register */
-	spinlock_t rf_lock;
-
 	/* watch dog every 2 sec */
 	struct delayed_work watch_dog_work;
 	u32 watch_dog_cnt;