bonding: 3ad: use curr_slave_lock instead of bond->lock

In 3ad mode the only syncing needed by bond->lock is for the wq
and the recv handler, so change them to use curr_slave_lock.
There're no locking dependencies here as 3ad doesn't use
curr_slave_lock at all.

Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 11 insertions, 10 deletions

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index ee2c73a9de39..5d27a6207384 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -2057,7 +2057,7 @@ void bond_3ad_state_machine_handler(struct work_struct *work)
         struct port *port;
         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
 
-        read_lock(&bond->lock);
+        read_lock(&bond->curr_slave_lock);
         rcu_read_lock();
 
         /* check if there are any slaves */
@@ -2120,7 +2120,7 @@ re_arm:
                 }
         }
         rcu_read_unlock();
-        read_unlock(&bond->lock);
+        read_unlock(&bond->curr_slave_lock);
 
         if (should_notify_rtnl && rtnl_trylock()) {
                 bond_slave_state_notify(bond);
@@ -2395,7 +2395,6 @@ int __bond_3ad_get_active_agg_info(struct bonding *bond,
         return 0;
 }
 
-/* Wrapper used to hold bond->lock so no slave manipulation can occur */
 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
 {
         int ret;
@@ -2487,9 +2486,9 @@ int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
         if (!lacpdu)
                 return ret;
 
-        read_lock(&bond->lock);
+        read_lock(&bond->curr_slave_lock);
         ret = bond_3ad_rx_indication(lacpdu, slave, skb->len);
-        read_unlock(&bond->lock);
+        read_unlock(&bond->curr_slave_lock);
         return ret;
 }
 
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index f0f5eab0fab1..dcd331bd0c17 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1687,13 +1687,15 @@ static int __bond_release_one(struct net_device *bond_dev,
          * for this slave anymore.
          */
         netdev_rx_handler_unregister(slave_dev);
-        write_lock_bh(&bond->lock);
 
-        /* Inform AD package of unbinding of slave. */
-        if (BOND_MODE(bond) == BOND_MODE_8023AD)
+        if (BOND_MODE(bond) == BOND_MODE_8023AD) {
+                /* Sync against bond_3ad_rx_indication and
+                 * bond_3ad_state_machine_handler
+                 */
+                write_lock_bh(&bond->curr_slave_lock);
                 bond_3ad_unbind_slave(slave);
-
-        write_unlock_bh(&bond->lock);
+                write_unlock_bh(&bond->curr_slave_lock);
+        }
 
         netdev_info(bond_dev, "Releasing %s interface %s\n",
                     bond_is_active_slave(slave) ? "active" : "backup",