bonding: remove unwanted lock for bond_store_primaryxxx()

The bond_select_active_slave() will not release and acquire
bond lock, so it is no need to read the bond lock for them,
and the bond_store_primaryxxx() is already in RTNL, so remove the
unwanted lock.

Suggested-by: Jay Vosburgh <fubar@us.ibm.com>
Suggested-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index dad9bea..6368d29 100644 (file)
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -878,7 +878,6 @@ static ssize_t bonding_store_primary(struct device *d,
        if (!rtnl_trylock())
                return restart_syscall();
        block_netpoll_tx();
-       read_lock(&bond->lock);
        write_lock_bh(&bond->curr_slave_lock);
 
        if (!USES_PRIMARY(bond->params.mode)) {
@@ -918,7 +917,6 @@ static ssize_t bonding_store_primary(struct device *d,
                bond->dev->name, ifname, bond->dev->name);
 out:
        write_unlock_bh(&bond->curr_slave_lock);
-       read_unlock(&bond->lock);
        unblock_netpoll_tx();
        rtnl_unlock();
 
@@ -966,11 +964,9 @@ static ssize_t bonding_store_primary_reselect(struct device *d,
                new_value);
 
        block_netpoll_tx();
-       read_lock(&bond->lock);
        write_lock_bh(&bond->curr_slave_lock);
        bond_select_active_slave(bond);
        write_unlock_bh(&bond->curr_slave_lock);
-       read_unlock(&bond->lock);
        unblock_netpoll_tx();
 out:
        rtnl_unlock();