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Commit ebd93a7d authored by Ying Xue's avatar Ying Xue Committed by David S. Miller
Browse files

eql: use __dev_get_by_name instead of dev_get_by_name to find interface 



The following call chain indicates that eql_ioctl(), eql_enslave(),
eql_emancipate(), eql_g_slave_cfg() and eql_s_slave_cfg() are
protected under rtnl_lock. So if we use __dev_get_by_name() instead
of dev_get_by_name() to find interface handlers in them, this would
help us avoid to change interface reference counters.

dev_ioctl()
  rtnl_lock()
    dev_ifsioc()
      eql_ioctl()
        eql_enslave()
	eql_emancipate()
	eql_g_slave_cfg()
	eql_s_slave_cfg()
  rtnl_unlock()

Additionally we also change their return values from -EINVAL to
-ENODEV in case that interfaces are no found.

Signed-off-by: default avatarYing Xue <ying.xue@windriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0917b933

drivers/net/eql.c

+42 −53
Original line number Diff line number Diff line
@@ -395,6 +395,7 @@ static int __eql_insert_slave(slave_queue_t *queue, slave_t *slave) 
		if (duplicate_slave)

			eql_kill_one_slave(queue, duplicate_slave);



		dev_hold(slave->dev);

		list_add(&slave->list, &queue->all_slaves);

		queue->num_slaves++;

		slave->dev->flags |= IFF_SLAVE;
@@ -413,20 +414,19 @@ static int eql_enslave(struct net_device *master_dev, slaving_request_t __user * 
	if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))

		return -EFAULT;



	slave_dev  = dev_get_by_name(&init_net, srq.slave_name);

	if (slave_dev) {

	slave_dev = __dev_get_by_name(&init_net, srq.slave_name);

	if (!slave_dev)

		return -ENODEV;



	if ((master_dev->flags & IFF_UP) == IFF_UP) {

		/* slave is not a master & not already a slave: */

			if (!eql_is_master(slave_dev) &&

			    !eql_is_slave(slave_dev)) {

		if (!eql_is_master(slave_dev) && !eql_is_slave(slave_dev)) {

			slave_t *s = kmalloc(sizeof(*s), GFP_KERNEL);

			equalizer_t *eql = netdev_priv(master_dev);

			int ret;



				if (!s) {

					dev_put(slave_dev);

			if (!s)

				return -ENOMEM;

				}



			memset(s, 0, sizeof(*s));

			s->dev = slave_dev;
@@ -436,17 +436,14 @@ static int eql_enslave(struct net_device *master_dev, slaving_request_t __user * 


			spin_lock_bh(&eql->queue.lock);

			ret = __eql_insert_slave(&eql->queue, s);

				if (ret) {

					dev_put(slave_dev);

			if (ret)

				kfree(s);

				}



			spin_unlock_bh(&eql->queue.lock);



			return ret;

		}

	}

		dev_put(slave_dev);

	}



	return -EINVAL;

}
@@ -461,24 +458,20 @@ static int eql_emancipate(struct net_device *master_dev, slaving_request_t __use 
	if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))

		return -EFAULT;



	slave_dev = dev_get_by_name(&init_net, srq.slave_name);

	slave_dev = __dev_get_by_name(&init_net, srq.slave_name);

	if (!slave_dev)

		return -ENODEV;



	ret = -EINVAL;

	if (slave_dev) {

	spin_lock_bh(&eql->queue.lock);



	if (eql_is_slave(slave_dev)) {

			slave_t *slave = __eql_find_slave_dev(&eql->queue,

							      slave_dev);



		slave_t *slave = __eql_find_slave_dev(&eql->queue, slave_dev);

		if (slave) {

			eql_kill_one_slave(&eql->queue, slave);

			ret = 0;

		}

	}

		dev_put(slave_dev);



	spin_unlock_bh(&eql->queue.lock);

	}



	return ret;

}
@@ -494,7 +487,7 @@ static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *scp) 
	if (copy_from_user(&sc, scp, sizeof (slave_config_t)))

		return -EFAULT;



	slave_dev = dev_get_by_name(&init_net, sc.slave_name);

	slave_dev = __dev_get_by_name(&init_net, sc.slave_name);

	if (!slave_dev)

		return -ENODEV;
@@ -510,8 +503,6 @@ static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *scp) 
	}

	spin_unlock_bh(&eql->queue.lock);



	dev_put(slave_dev);



	if (!ret && copy_to_user(scp, &sc, sizeof (slave_config_t)))

		ret = -EFAULT;
@@ -529,7 +520,7 @@ static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *scp) 
	if (copy_from_user(&sc, scp, sizeof (slave_config_t)))

		return -EFAULT;



	slave_dev = dev_get_by_name(&init_net, sc.slave_name);

	slave_dev = __dev_get_by_name(&init_net, sc.slave_name);

	if (!slave_dev)

		return -ENODEV;
@@ -548,8 +539,6 @@ static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *scp) 
	}

	spin_unlock_bh(&eql->queue.lock);



	dev_put(slave_dev);



	return ret;

}