bonding: don't call slave_xxx_netpoll under spinlocks

The slave_xxx_netpoll will call synchronize_rcu_bh(),
so the function may schedule and sleep, it should't be
called under spinlocks.

bond_netpoll_setup() and bond_netpoll_cleanup() are always
protected by rtnl lock, it is no need to take the read lock,
as the slave list couldn't be changed outside rtnl lock.

Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Cc: Jay Vosburgh <fubar@us.ibm.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index ae9864c..5cd8e0a 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1219,8 +1219,9 @@ static void bond_poll_controller(struct net_device *bond_dev)
 {
 }
 
-static void __bond_netpoll_cleanup(struct bonding *bond)
+static void bond_netpoll_cleanup(struct net_device *bond_dev)
 {
+       struct bonding *bond = netdev_priv(bond_dev);
        struct slave *slave;
        int i;
 
@@ -1228,14 +1229,6 @@ static void __bond_netpoll_cleanup(struct bonding *bond)
                if (IS_UP(slave->dev))
                        slave_disable_netpoll(slave);
 }
-static void bond_netpoll_cleanup(struct net_device *bond_dev)
-{
-       struct bonding *bond = netdev_priv(bond_dev);
-
-       read_lock(&bond->lock);
-       __bond_netpoll_cleanup(bond);
-       read_unlock(&bond->lock);
-}
 
 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
 {
@@ -1243,15 +1236,13 @@ static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, g
        struct slave *slave;
        int i, err = 0;
 
-       read_lock(&bond->lock);
        bond_for_each_slave(bond, slave, i) {
                err = slave_enable_netpoll(slave);
                if (err) {
-                       __bond_netpoll_cleanup(bond);
+                       bond_netpoll_cleanup(dev);
                        break;
                }
        }
-       read_unlock(&bond->lock);
        return err;
 }