linux-kernel - [PATCH 9/9] rtw88: fw: Convert h2c.lock from a spinlock to a mutex

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Date:   Tue, 28 Dec 2021 22:15:01 +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>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH 9/9] rtw88: fw: Convert h2c.lock from a spinlock to a mutex

Upcoming SDIO support may sleep in the read/write handlers. Switch
the h2c.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/fw.c   | 14 +++++++-------
 drivers/net/wireless/realtek/rtw88/main.c |  2 +-
 drivers/net/wireless/realtek/rtw88/main.h |  2 +-
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/fw.c b/drivers/net/wireless/realtek/rtw88/fw.c
index 2f7c036f9022..1bff43c14a05 100644
--- a/drivers/net/wireless/realtek/rtw88/fw.c
+++ b/drivers/net/wireless/realtek/rtw88/fw.c
@@ -317,7 +317,7 @@ static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev,
 		h2c[3], h2c[2], h2c[1], h2c[0],
 		h2c[7], h2c[6], h2c[5], h2c[4]);
 
-	spin_lock(&rtwdev->h2c.lock);
+	mutex_lock(&rtwdev->h2c.lock);
 
 	box = rtwdev->h2c.last_box_num;
 	switch (box) {
@@ -342,9 +342,9 @@ static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev,
 		goto out;
 	}
 
-	ret = read_poll_timeout_atomic(rtw_read8, box_state,
-				       !((box_state >> box) & 0x1), 100, 3000,
-				       false, rtwdev, REG_HMETFR);
+	ret = read_poll_timeout(rtw_read8, box_state,
+				!((box_state >> box) & 0x1), 100, 3000, false,
+				rtwdev, REG_HMETFR);
 
 	if (ret) {
 		rtw_err(rtwdev, "failed to send h2c command\n");
@@ -360,7 +360,7 @@ static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev,
 		rtwdev->h2c.last_box_num = 0;
 
 out:
-	spin_unlock(&rtwdev->h2c.lock);
+	mutex_unlock(&rtwdev->h2c.lock);
 }
 
 void rtw_fw_h2c_cmd_dbg(struct rtw_dev *rtwdev, u8 *h2c)
@@ -372,7 +372,7 @@ static void rtw_fw_send_h2c_packet(struct rtw_dev *rtwdev, u8 *h2c_pkt)
 {
 	int ret;
 
-	spin_lock(&rtwdev->h2c.lock);
+	mutex_lock(&rtwdev->h2c.lock);
 
 	FW_OFFLOAD_H2C_SET_SEQ_NUM(h2c_pkt, rtwdev->h2c.seq);
 	ret = rtw_hci_write_data_h2c(rtwdev, h2c_pkt, H2C_PKT_SIZE);
@@ -380,7 +380,7 @@ static void rtw_fw_send_h2c_packet(struct rtw_dev *rtwdev, u8 *h2c_pkt)
 		rtw_err(rtwdev, "failed to send h2c packet\n");
 	rtwdev->h2c.seq++;
 
-	spin_unlock(&rtwdev->h2c.lock);
+	mutex_unlock(&rtwdev->h2c.lock);
 }
 
 void
diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index a94678effd77..e883f5ecf307 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->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->h2c.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 e7a60e6f8596..495a28028ac0 100644
--- a/drivers/net/wireless/realtek/rtw88/main.h
+++ b/drivers/net/wireless/realtek/rtw88/main.h
@@ -1975,7 +1975,7 @@ struct rtw_dev {
 		/* incicate the mail box to use with fw */
 		u8 last_box_num;
 		/* protect to send h2c to fw */
-		spinlock_t lock;
+		struct mutex lock;
 		u32 seq;
 	} h2c;
 
-- 
2.34.1