linux-kernel - [PATCH v3 05/11] rtw88: Drop coex mutex

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20221122145226.4065843-6-s.hauer@pengutronix.de>
Date:   Tue, 22 Nov 2022 15:52:20 +0100
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     linux-wireless@...r.kernel.org
Cc:     Neo Jou <neojou@...il.com>, Hans Ulli Kroll <linux@...i-kroll.de>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        Yan-Hsuan Chuang <tony0620emma@...il.com>,
        Kalle Valo <kvalo@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        kernel@...gutronix.de, Johannes Berg <johannes@...solutions.net>,
        Alexander Hochbaum <alex@...udo.com>,
        Da Xue <da@...re.computer>, Po-Hao Huang <phhuang@...ltek.com>,
        Viktor Petrenko <g0000ga@...il.com>,
        Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH v3 05/11] rtw88: Drop coex mutex

coex->mutex is used in rtw_coex_info_request() only. Most callers of this
function hold rtwdev->mutex already, except for one callsite in the
debugfs code. The debugfs code alone doesn't justify the extra lock, so
acquire rtwdev->mutex there as well and drop the now unnecessary
spinlock.

Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
---
 drivers/net/wireless/realtek/rtw88/coex.c  | 3 +--
 drivers/net/wireless/realtek/rtw88/debug.c | 2 ++
 drivers/net/wireless/realtek/rtw88/main.c  | 2 --
 drivers/net/wireless/realtek/rtw88/main.h  | 2 --
 4 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/coex.c b/drivers/net/wireless/realtek/rtw88/coex.c
index 6276ad6242991..38697237ee5f0 100644
--- a/drivers/net/wireless/realtek/rtw88/coex.c
+++ b/drivers/net/wireless/realtek/rtw88/coex.c
@@ -633,7 +633,7 @@ static struct sk_buff *rtw_coex_info_request(struct rtw_dev *rtwdev,
 	struct rtw_coex *coex = &rtwdev->coex;
 	struct sk_buff *skb_resp = NULL;
 
-	mutex_lock(&coex->mutex);
+	lockdep_assert_held(&rtwdev->mutex);
 
 	rtw_fw_query_bt_mp_info(rtwdev, req);
 
@@ -650,7 +650,6 @@ static struct sk_buff *rtw_coex_info_request(struct rtw_dev *rtwdev,
 	}
 
 out:
-	mutex_unlock(&coex->mutex);
 	return skb_resp;
 }
 
diff --git a/drivers/net/wireless/realtek/rtw88/debug.c b/drivers/net/wireless/realtek/rtw88/debug.c
index f5b8a77ebc67b..fa3d73b333ba0 100644
--- a/drivers/net/wireless/realtek/rtw88/debug.c
+++ b/drivers/net/wireless/realtek/rtw88/debug.c
@@ -841,7 +841,9 @@ static int rtw_debugfs_get_coex_info(struct seq_file *m, void *v)
 	struct rtw_debugfs_priv *debugfs_priv = m->private;
 	struct rtw_dev *rtwdev = debugfs_priv->rtwdev;
 
+	mutex_lock(&rtwdev->mutex);
 	rtw_coex_display_coex_info(rtwdev, m);
+	mutex_unlock(&rtwdev->mutex);
 
 	return 0;
 }
diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index c98e56890401c..0a2ce7f50f412 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -2071,7 +2071,6 @@ int rtw_core_init(struct rtw_dev *rtwdev)
 	spin_lock_init(&rtwdev->tx_report.q_lock);
 
 	mutex_init(&rtwdev->mutex);
-	mutex_init(&rtwdev->coex.mutex);
 	mutex_init(&rtwdev->hal.tx_power_mutex);
 
 	init_waitqueue_head(&rtwdev->coex.wait);
@@ -2143,7 +2142,6 @@ void rtw_core_deinit(struct rtw_dev *rtwdev)
 	}
 
 	mutex_destroy(&rtwdev->mutex);
-	mutex_destroy(&rtwdev->coex.mutex);
 	mutex_destroy(&rtwdev->hal.tx_power_mutex);
 }
 EXPORT_SYMBOL(rtw_core_deinit);
diff --git a/drivers/net/wireless/realtek/rtw88/main.h b/drivers/net/wireless/realtek/rtw88/main.h
index 4b57542bef1e9..77fd48b6cc453 100644
--- a/drivers/net/wireless/realtek/rtw88/main.h
+++ b/drivers/net/wireless/realtek/rtw88/main.h
@@ -1501,8 +1501,6 @@ struct rtw_coex_stat {
 };
 
 struct rtw_coex {
-	/* protects coex info request section */
-	struct mutex mutex;
 	struct sk_buff_head queue;
 	wait_queue_head_t wait;
 
-- 
2.30.2