netdev - [PATCH v6 3/6] Bluetooth: switch to lock

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Message-Id: <20210810041410.142035-4-desmondcheongzx@gmail.com>
Date:   Tue, 10 Aug 2021 12:14:07 +0800
From:   Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>
To:     marcel@...tmann.org, johan.hedberg@...il.com, luiz.dentz@...il.com,
        davem@...emloft.net, kuba@...nel.org, sudipm.mukherjee@...il.com
Cc:     Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, skhan@...uxfoundation.org,
        gregkh@...uxfoundation.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: [PATCH v6 3/6] Bluetooth: switch to lock_sock in SCO

Since sco_sock_timeout is now scheduled using delayed work, it is no
longer run in SOFTIRQ context. Hence bh_lock_sock is no longer
necessary in SCO to synchronise between user contexts and SOFTIRQ
processing.

As such, calls to bh_lock_sock should be replaced with lock_sock to
synchronize with other concurrent processes that use lock_sock.

Signed-off-by: Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>
---
 net/bluetooth/sco.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 94a3aa686556..68b51e321e82 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -93,10 +93,10 @@ static void sco_sock_timeout(struct work_struct *work)
 
 	BT_DBG("sock %p state %d", sk, sk->sk_state);
 
-	bh_lock_sock(sk);
+	lock_sock(sk);
 	sk->sk_err = ETIMEDOUT;
 	sk->sk_state_change(sk);
-	bh_unlock_sock(sk);
+	release_sock(sk);
 
 	sco_sock_kill(sk);
 	sock_put(sk);
@@ -193,10 +193,10 @@ static void sco_conn_del(struct hci_conn *hcon, int err)
 
 	if (sk) {
 		sock_hold(sk);
-		bh_lock_sock(sk);
+		lock_sock(sk);
 		sco_sock_clear_timer(sk);
 		sco_chan_del(sk, err);
-		bh_unlock_sock(sk);
+		release_sock(sk);
 		sco_sock_kill(sk);
 		sock_put(sk);
 
@@ -1105,10 +1105,10 @@ static void sco_conn_ready(struct sco_conn *conn)
 
 	if (sk) {
 		sco_sock_clear_timer(sk);
-		bh_lock_sock(sk);
+		lock_sock(sk);
 		sk->sk_state = BT_CONNECTED;
 		sk->sk_state_change(sk);
-		bh_unlock_sock(sk);
+		release_sock(sk);
 	} else {
 		sco_conn_lock(conn);
 
@@ -1123,12 +1123,12 @@ static void sco_conn_ready(struct sco_conn *conn)
 			return;
 		}
 
-		bh_lock_sock(parent);
+		lock_sock(parent);
 
 		sk = sco_sock_alloc(sock_net(parent), NULL,
 				    BTPROTO_SCO, GFP_ATOMIC, 0);
 		if (!sk) {
-			bh_unlock_sock(parent);
+			release_sock(parent);
 			sco_conn_unlock(conn);
 			return;
 		}
@@ -1149,7 +1149,7 @@ static void sco_conn_ready(struct sco_conn *conn)
 		/* Wake up parent */
 		parent->sk_data_ready(parent);
 
-		bh_unlock_sock(parent);
+		release_sock(parent);
 
 		sco_conn_unlock(conn);
 	}
-- 
2.25.1