linux-kernel - [PATCH 2/2] net/core: move the lockdep-init of sk_callback_lock to sk_init

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Date: Sun, 26 May 2024 22:57:18 +0800
From: Gou Hao <gouhao@...ontech.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	kuniyu@...zon.com,
	wuyun.abel@...edance.com,
	leitao@...ian.org,
	alexander@...alicyn.com,
	dhowells@...hat.com,
	netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	zhanjun@...ontech.com,
	gouhaojake@....com
Subject: [PATCH 2/2] net/core: move the lockdep-init of sk_callback_lock to sk_init_common()

In commit cdfbabfb2f0c ("net: Work around lockdep limitation in
sockets that use sockets"), it introduces 'af_kern_callback_keys'
to lockdep-init of sk_callback_lock according to 'sk_kern_sock',
it modifies sock_init_data() only, and sk_clone_lock() calls
sk_init_common() to initialize sk_callback_lock too, so the
lockdep-init of sk_callback_lock should be moved to sk_init_common().

Signed-off-by: Gou Hao <gouhao@...ontech.com>
---
 net/core/sock.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index 67b10954e0cf..521e6373d4f7 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2262,7 +2262,12 @@ static void sk_init_common(struct sock *sk)
 	lockdep_set_class_and_name(&sk->sk_error_queue.lock,
 			af_elock_keys + sk->sk_family,
 			af_family_elock_key_strings[sk->sk_family]);
-	lockdep_set_class_and_name(&sk->sk_callback_lock,
+	if (sk->sk_kern_sock)
+		lockdep_set_class_and_name(&sk->sk_callback_lock,
+			af_kern_callback_keys + sk->sk_family,
+			af_family_kern_clock_key_strings[sk->sk_family]);
+	else
+		lockdep_set_class_and_name(&sk->sk_callback_lock,
 			af_callback_keys + sk->sk_family,
 			af_family_clock_key_strings[sk->sk_family]);
 }
@@ -3460,17 +3465,6 @@ void sock_init_data_uid(struct socket *sock, struct sock *sk, kuid_t uid)
 	}
 	sk->sk_uid	=	uid;
 
-	if (sk->sk_kern_sock)
-		lockdep_set_class_and_name(
-			&sk->sk_callback_lock,
-			af_kern_callback_keys + sk->sk_family,
-			af_family_kern_clock_key_strings[sk->sk_family]);
-	else
-		lockdep_set_class_and_name(
-			&sk->sk_callback_lock,
-			af_callback_keys + sk->sk_family,
-			af_family_clock_key_strings[sk->sk_family]);
-
 	sk->sk_state_change	=	sock_def_wakeup;
 	sk->sk_data_ready	=	sock_def_readable;
 	sk->sk_write_space	=	sock_def_write_space;
-- 
2.20.1