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net: restore the original spinlock to protect unicast list

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There is a path when an assetion in dev_unicast_sync() appears.

igmp6_group_added -> dev_mc_add -> __dev_set_rx_mode ->
-> vlan_dev_set_rx_mode -> dev_unicast_sync

Therefore we cannot protect this list with rtnl. This patch restores the
original protecting this list with spinlock.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Tested-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2009-07-30 01:06:12 +00:00 committed by David S. Miller
parent 50c643e765
commit a6ac65db23
1 changed files with 16 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
net/core/dev.c
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@ -3865,10 +3865,12 @@ int dev_unicast_delete(struct net_device *dev, void *addr)
ASSERT_RTNL();
netif_addr_lock_bh(dev);
err = __hw_addr_del(&dev->uc, addr, dev->addr_len,
NETDEV_HW_ADDR_T_UNICAST);
if (!err)
__dev_set_rx_mode(dev);
netif_addr_unlock_bh(dev);
return err;
}
EXPORT_SYMBOL(dev_unicast_delete);
@ -3889,10 +3891,12 @@ int dev_unicast_add(struct net_device *dev, void *addr)
ASSERT_RTNL();
netif_addr_lock_bh(dev);
err = __hw_addr_add(&dev->uc, addr, dev->addr_len,
NETDEV_HW_ADDR_T_UNICAST);
if (!err)
__dev_set_rx_mode(dev);
netif_addr_unlock_bh(dev);
return err;
}
EXPORT_SYMBOL(dev_unicast_add);
@ -3949,7 +3953,8 @@ void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
* @from: source device
*
* Add newly added addresses to the destination device and release
* addresses that have no users left.
* addresses that have no users left. The source device must be
* locked by netif_tx_lock_bh.
*
* This function is intended to be called from the dev->set_rx_mode
* function of layered software devices.
@ -3958,14 +3963,14 @@ int dev_unicast_sync(struct net_device *to, struct net_device *from)
{
int err = 0;
ASSERT_RTNL();
if (to->addr_len != from->addr_len)
return -EINVAL;
netif_addr_lock_bh(to);
err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len);
if (!err)
__dev_set_rx_mode(to);
netif_addr_unlock_bh(to);
return err;
}
EXPORT_SYMBOL(dev_unicast_sync);
@ -3981,28 +3986,30 @@ EXPORT_SYMBOL(dev_unicast_sync);
*/
void dev_unicast_unsync(struct net_device *to, struct net_device *from)
{
ASSERT_RTNL();
if (to->addr_len != from->addr_len)
return;
netif_addr_lock_bh(from);
netif_addr_lock(to);
__hw_addr_unsync(&to->uc, &from->uc, to->addr_len);
__dev_set_rx_mode(to);
netif_addr_unlock(to);
netif_addr_unlock_bh(from);
}
EXPORT_SYMBOL(dev_unicast_unsync);
static void dev_unicast_flush(struct net_device *dev)
{
/* rtnl_mutex must be held here */
netif_addr_lock_bh(dev);
__hw_addr_flush(&dev->uc);
netif_addr_unlock_bh(dev);
}
static void dev_unicast_init(struct net_device *dev)
{
/* rtnl_mutex must be held here */
netif_addr_lock_bh(dev);
__hw_addr_init(&dev->uc);
netif_addr_unlock_bh(dev);
}