From: Cong Wang <xiyou.wangcong@gmail.com>
Date: Sat, 2 May 2020 22:22:20 -0700
Subject: bonding: remove useless stats_lock_key
Patch-mainline: v5.8-rc1
Git-commit: e7511f560f5499c664c1ba9181c76044e2af578d
References: bsc#1176447

After commit b3e80d44f5b1
("bonding: fix lockdep warning in bond_get_stats()") the dynamic
key is no longer necessary, as we compute nest level at run-time.
So, we can just remove it to save some lockdep key entries.

Test commands:
 ip link add bond0 type bond
 ip link add bond1 type bond
 ip link set bond0 master bond1
 ip link set bond0 nomaster
 ip link set bond1 master bond0

Reported-and-tested-by: syzbot+aaa6fa4949cc5d9b7b25@syzkaller.appspotmail.com
Cc: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/bonding/bond_main.c |    3 ---
 include/net/bonding.h           |    1 -
 2 files changed, 4 deletions(-)

--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4492,7 +4492,6 @@ static void bond_uninit(struct net_devic
 
 	list_del(&bond->bond_list);
 
-	lockdep_unregister_key(&bond->stats_lock_key);
 	bond_debug_unregister(bond);
 }
 
@@ -4897,8 +4896,6 @@ static int bond_init(struct net_device *
 		return -ENOMEM;
 
 	spin_lock_init(&bond->stats_lock);
-	lockdep_register_key(&bond->stats_lock_key);
-	lockdep_set_class(&bond->stats_lock, &bond->stats_lock_key);
 	netdev_lockdep_set_classes(bond_dev);
 
 	list_add_tail(&bond->bond_list, &bn->dev_list);
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -237,7 +237,6 @@ struct bonding {
 	struct	 dentry *debug_dir;
 #endif /* CONFIG_DEBUG_FS */
 	struct rtnl_link_stats64 bond_stats;
-	struct lock_class_key stats_lock_key;
 };
 
 #define bond_slave_get_rcu(dev) \