From 293a0c7587a4dbfa700e23bc93f80dd2ad40ed59 Mon Sep 17 00:00:00 2001 From: Sascha Hauer 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 Reviewed-by: Ping-Ke Shih Signed-off-by: Kalle Valo 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;