netdev - [PATCH v3 2/2 RESEND] resolve gtp possible deadlock warning

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Message-Id: <c2ac8e30806af319eb96f67103196b7cda22d562.1729031472.git.danielyangkang@gmail.com>
Date: Tue, 15 Oct 2024 15:48:05 -0700
From: Daniel Yang <danielyangkang@...il.com>
To: Wenjia Zhang <wenjia@...ux.ibm.com>,
	Jan Karcher <jaka@...ux.ibm.com>,
	"D. Wythe" <alibuda@...ux.alibaba.com>,
	Tony Lu <tonylu@...ux.alibaba.com>,
	Wen Gu <guwen@...ux.alibaba.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	linux-s390@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: danielyangkang@...il.com,
	syzbot+e953a8f3071f5c0a28fd@...kaller.appspotmail.com
Subject: [PATCH v3 2/2 RESEND] resolve gtp possible deadlock warning

From: Daniel Yang <danielyangkang@...il.com>

Moved lockdep annotation to separate function for readability.

Signed-off-by: Daniel Yang <danielyangkang@...il.com>
Reported-by: syzbot+e953a8f3071f5c0a28fd@...kaller.appspotmail.com

---
 net/smc/smc_inet.c | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/net/smc/smc_inet.c b/net/smc/smc_inet.c
index 7ae49ffd2..b3eedc3b0 100644
--- a/net/smc/smc_inet.c
+++ b/net/smc/smc_inet.c
@@ -111,18 +111,7 @@ static struct inet_protosw smc_inet6_protosw = {
 static struct lock_class_key smc_slock_keys[2];
 static struct lock_class_key smc_keys[2];
 
-static int smc_inet_init_sock(struct sock *sk)
-{
-	struct net *net = sock_net(sk);
-	int rc;
-
-	/* init common smc sock */
-	smc_sk_init(net, sk, IPPROTO_SMC);
-	/* create clcsock */
-	rc = smc_create_clcsk(net, sk, sk->sk_family);
-	if (rc)
-		return rc;
-
+static inline void smc_inet_lockdep_annotate(struct sock *sk) {
 	switch (sk->sk_family) {
 		case AF_INET:
 			sock_lock_init_class_and_name(sk, "slock-AF_INET-SMC",
@@ -139,8 +128,21 @@ static int smc_inet_init_sock(struct sock *sk)
 		default:
 			WARN_ON_ONCE(1);
 	}
+}
 
-	return 0;
+static int smc_inet_init_sock(struct sock *sk)
+{
+	struct net *net = sock_net(sk);
+	int rc;
+
+	/* init common smc sock */
+	smc_sk_init(net, sk, IPPROTO_SMC);
+	/* create clcsock */
+	rc = smc_create_clcsk(net, sk, sk->sk_family);
+	if (!rc)
+		smc_inet_lockdep_annotate(sk);
+
+	return rc;
 }
 
 int __init smc_inet_init(void)
-- 
2.39.2