netdev - [RFC PATCH net-next 2/2] net: dsa: remove lockdep class for DSA master address list

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Date:   Fri,  7 Jan 2022 20:48:42 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Subject: [RFC PATCH net-next 2/2] net: dsa: remove lockdep class for DSA master address list

Since commit 2f1e8ea726e9 ("net: dsa: link interfaces with the DSA
master to get rid of lockdep warnings"), suggested by Cong Wang, the
DSA interfaces and their master have different dev->nested_level, which
makes netif_addr_lock() stop complaining about potentially recursive
locking on the same lock class.

So we no longer need DSA masters to have their own lockdep class.

Cc: Cong Wang <xiyou.wangcong@...il.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/dsa/master.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/net/dsa/master.c b/net/dsa/master.c
index 2199104ca7df..6ac393cc6ea7 100644
--- a/net/dsa/master.c
+++ b/net/dsa/master.c
@@ -330,8 +330,6 @@ static const struct attribute_group dsa_group = {
 	.attrs	= dsa_slave_attrs,
 };
 
-static struct lock_class_key dsa_master_addr_list_lock_key;
-
 int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
 {
 	struct dsa_switch *ds = cpu_dp->ds;
@@ -353,8 +351,6 @@ int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
 	wmb();
 
 	dev->dsa_ptr = cpu_dp;
-	lockdep_set_class(&dev->addr_list_lock,
-			  &dsa_master_addr_list_lock_key);
 
 	dsa_master_set_promiscuity(dev, 1);
 
-- 
2.25.1