netdev - [PATCH v3 7/8] rtw88: hci: Convert rf_lock from a spinlock to a mutex

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Date:   Sat,  8 Jan 2022 01:55:32 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     linux-wireless@...r.kernel.org
Cc:     tony0620emma@...il.com, kvalo@...eaurora.org,
        johannes@...solutions.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Neo Jou <neojou@...il.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Pkshih <pkshih@...ltek.com>, Ed Swierk <eswierk@...st>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH v3 7/8] rtw88: hci: Convert rf_lock from a spinlock to a mutex

Upcoming SDIO support may sleep in the read/write handlers. Switch
rf_lock from a spinlock to a mutex to allow for this behavior.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/net/wireless/realtek/rtw88/hci.h  | 11 ++++-------
 drivers/net/wireless/realtek/rtw88/main.c |  2 +-
 drivers/net/wireless/realtek/rtw88/main.h |  2 +-
 3 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/hci.h b/drivers/net/wireless/realtek/rtw88/hci.h
index 4c6fc6fb3f83..3c730b7a94f7 100644
--- 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);
+	mutex_lock(&rtwdev->rf_lock);
 	val = rtwdev->chip->ops->read_rf(rtwdev, rf_path, addr, mask);
-	spin_unlock_irqrestore(&rtwdev->rf_lock, flags);
+	mutex_unlock(&rtwdev->rf_lock);
 
 	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;
-
-	spin_lock_irqsave(&rtwdev->rf_lock, flags);
+	mutex_lock(&rtwdev->rf_lock);
 	rtwdev->chip->ops->write_rf(rtwdev, rf_path, addr, mask, data);
-	spin_unlock_irqrestore(&rtwdev->rf_lock, flags);
+	mutex_unlock(&rtwdev->rf_lock);
 }
 
 static inline u32
diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 3d4257e0367a..a94678effd77 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -1920,12 +1920,12 @@ 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);
 
 	mutex_init(&rtwdev->mutex);
+	mutex_init(&rtwdev->rf_lock);
 	mutex_init(&rtwdev->coex.mutex);
 	mutex_init(&rtwdev->hal.tx_power_mutex);
 
diff --git a/drivers/net/wireless/realtek/rtw88/main.h b/drivers/net/wireless/realtek/rtw88/main.h
index dc1cd9bd4b8a..e7a60e6f8596 100644
--- a/drivers/net/wireless/realtek/rtw88/main.h
+++ b/drivers/net/wireless/realtek/rtw88/main.h
@@ -1949,7 +1949,7 @@ struct rtw_dev {
 	struct mutex mutex;
 
 	/* read/write rf register */
-	spinlock_t rf_lock;
+	struct mutex rf_lock;
 
 	/* watch dog every 2 sec */
 	struct delayed_work watch_dog_work;
-- 
2.34.1