bonding: convert curr_slave_lock to a spinlock and rename it

curr_slave_lock is now a misleading name, a much better name is
mode_lock as it'll be used for each mode's purposes and it's no longer
necessary to use a rwlock, a simple spinlock is enough.

Suggested-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 6 insertions, 7 deletions

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index dfd3a7835d17..1824d1df4d09 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->curr_slave_lock);
+        spin_lock_bh(&bond->mode_lock);
         rcu_read_lock();
 
         /* check if there are any slaves */
@@ -2120,7 +2120,7 @@ re_arm:
                 }
         }
         rcu_read_unlock();
-        read_unlock(&bond->curr_slave_lock);
+        spin_unlock_bh(&bond->mode_lock);
 
         if (should_notify_rtnl && rtnl_trylock()) {
                 bond_slave_state_notify(bond);
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 3b06685260b8..99d21c2fd44f 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1679,9 +1679,9 @@ static int __bond_release_one(struct net_device *bond_dev,
                 /* Sync against bond_3ad_rx_indication and
                  * bond_3ad_state_machine_handler
                  */
-                write_lock_bh(&bond->curr_slave_lock);
+                spin_lock_bh(&bond->mode_lock);
                 bond_3ad_unbind_slave(slave);
-                write_unlock_bh(&bond->curr_slave_lock);
+                spin_unlock_bh(&bond->mode_lock);
         }
 
         netdev_info(bond_dev, "Releasing %s interface %s\n",
@@ -3850,8 +3850,7 @@ void bond_setup(struct net_device *bond_dev)
 {
         struct bonding *bond = netdev_priv(bond_dev);
 
-        /* initialize rwlocks */
-        rwlock_init(&bond->curr_slave_lock);
+        spin_lock_init(&bond->mode_lock);
         bond->params = bonding_defaults;
 
         /* Initialize pointers */
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 02afdeb08765..0cda34b827f8 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -195,7 +195,7 @@ struct bonding {
         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
         int     (*recv_probe)(const struct sk_buff *, struct bonding *,
                               struct slave *);
-        rwlock_t curr_slave_lock;
+        spinlock_t mode_lock;
         u8       send_peer_notif;
         u8       igmp_retrans;
 #ifdef CONFIG_PROC_FS