[PATCH v5 04/11] wifi: rtw88: Drop h2c.lock

Sascha Hauer
2022-12-02T08:13:26Z

The h2c.lock spinlock is used in rtw_fw_send_h2c_command() and
rtw_fw_send_h2c_packet(). Most callers call this with rtwdev->mutex
held, except from one callsite in the debugfs code. The debugfs code
alone doesn't justify the extra lock, so acquire rtwdev->mutex in
debugfs and drop the now unnecessary spinlock.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
drivers/net/wireless/realtek/rtw88/debug.c | 2 ++
drivers/net/wireless/realtek/rtw88/fw.c | 13 ++++---------
drivers/net/wireless/realtek/rtw88/main.c | 1 -
drivers/net/wireless/realtek/rtw88/main.h | 2 --
4 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/debug.c b/drivers/net/wireless/realtek/rtw88/debug.c
index 70e19f2a1a355..f5b8a77ebc67b 100644
--- a/drivers/net/wireless/realtek/rtw88/debug.c
+++ b/drivers/net/wireless/realtek/rtw88/debug.c
@@ -392,7 +392,9 @@ static ssize_t rtw_debugfs_set_h2c(struct file *filp,
return -EINVAL;
}

+ mutex_lock(&rtwdev->mutex);
rtw_fw_h2c_cmd_dbg(rtwdev, param);
+ mutex_unlock(&rtwdev->mutex);

return count;
}
diff --git a/drivers/net/wireless/realtek/rtw88/fw.c b/drivers/net/wireless/realtek/rtw88/fw.c
index 0b5f903c0f366..a58c80d4825b1 100644
--- a/drivers/net/wireless/realtek/rtw88/fw.c
+++ b/drivers/net/wireless/realtek/rtw88/fw.c
@@ -322,7 +322,7 @@ 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);
+ lockdep_assert_held(&rtwdev->mutex);

box = rtwdev->h2c.last_box_num;
switch (box) {
@@ -344,7 +344,7 @@ static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev,
break;
default:
WARN(1, "invalid h2c mail box number\n");
- goto out;
+ return;
}

ret = read_poll_timeout_atomic(rtw_read8, box_state,
@@ -353,7 +353,7 @@ static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev,

if (ret) {
rtw_err(rtwdev, "failed to send h2c command\n");
- goto out;
+ return;
}

for (idx = 0; idx < 4; idx++)
@@ -363,9 +363,6 @@ static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev,

if (++rtwdev->h2c.last_box_num >= 4)
rtwdev->h2c.last_box_num = 0;
-
-out:
- spin_unlock(&rtwdev->h2c.lock);
}

void rtw_fw_h2c_cmd_dbg(struct rtw_dev *rtwdev, u8 *h2c)
@@ -377,15 +374,13 @@ static void rtw_fw_send_h2c_packet(struct rtw_dev *rtwdev, u8 *h2c_pkt)
{
int ret;

- spin_lock(&rtwdev->h2c.lock);
+ lockdep_assert_held(&rtwdev->mutex);

FW_OFFLOAD_H2C_SET_SEQ_NUM(h2c_pkt, rtwdev->h2c.seq);
ret = rtw_hci_write_data_h2c(rtwdev, h2c_pkt, H2C_PKT_SIZE);
if (ret)
rtw_err(rtwdev, "failed to send h2c packet\n");
rtwdev->h2c.seq++;
-
- spin_unlock(&rtwdev->h2c.lock);
}

void
diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 710ddb0283c82..c98e56890401c 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -2067,7 +2067,6 @@ 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->h2c.lock);
spin_lock_init(&rtwdev->txq_lock);
spin_lock_init(&rtwdev->tx_report.q_lock);

diff --git a/drivers/net/wireless/realtek/rtw88/main.h b/drivers/net/wireless/realtek/rtw88/main.h
index f24d17f482aaa..4b57542bef1e9 100644
--- a/drivers/net/wireless/realtek/rtw88/main.h
+++ b/drivers/net/wireless/realtek/rtw88/main.h
@@ -2020,8 +2020,6 @@ struct rtw_dev {
struct {
/* incicate the mail box to use with fw */
u8 last_box_num;
- /* protect to send h2c to fw */
- spinlock_t lock;
u32 seq;
} h2c;

--
2.30.2