From: NeilBrown <neilb@suse.de>
Date: Tue, 23 Nov 2021 09:40:35 +1100
Subject: [PATCH] SUNRPC: use different lock keys for INET6 and LOCAL
Git-commit: 064a91771f7aae4ea2d13033b64e921951d216ce
Patch-mainline: v5.16
References: git-fixes

xprtsock.c reclassifies sock locks based on the protocol.
However there are 3 protocols and only 2 classification keys.
The same key is used for both INET6 and LOCAL.

This causes lockdep complaints.  The complaints started since Commit
ea9afca88bbe ("SUNRPC: Replace use of socket sk_callback_lock with
sock_lock") which resulted in the sock locks beings used more.

So add another key, and renumber them slightly.

Fixes: ea9afca88bbe ("SUNRPC: Replace use of socket sk_callback_lock with sock_lock")
Fixes: 176e21ee2ec8 ("SUNRPC: Support for RPC over AF_LOCAL transports")
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Acked-by: NeilBrown <neilb@suse.com>

---
 net/sunrpc/xprtsock.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1740,15 +1740,15 @@ static void xs_local_set_port(struct rpc
 }
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
-static struct lock_class_key xs_key[2];
-static struct lock_class_key xs_slock_key[2];
+static struct lock_class_key xs_key[3];
+static struct lock_class_key xs_slock_key[3];
 
 static inline void xs_reclassify_socketu(struct socket *sock)
 {
 	struct sock *sk = sock->sk;
 
 	sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
-		&xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
+		&xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]);
 }
 
 static inline void xs_reclassify_socket4(struct socket *sock)
@@ -1756,7 +1756,7 @@ static inline void xs_reclassify_socket4
 	struct sock *sk = sock->sk;
 
 	sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
-		&xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
+		&xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]);
 }
 
 static inline void xs_reclassify_socket6(struct socket *sock)
@@ -1764,7 +1764,7 @@ static inline void xs_reclassify_socket6
 	struct sock *sk = sock->sk;
 
 	sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
-		&xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
+		&xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]);
 }
 
 static inline void xs_reclassify_socket(int family, struct socket *sock)