提交 2429f7ac 编写于 作者: J Jiri Pirko 提交者: David S. Miller

net: introduce netif_addr_lock_nested() and call if when appropriate

dev_uc_sync() and dev_mc_sync() are acquiring netif_addr_lock for
destination device of synchronization. Since netif_addr_lock is
already held at the time for source device, this triggers lockdep
deadlock warning.

There's no way this deadlock can happen so use spin_lock_nested() to
silence the warning.
Signed-off-by: NJiri Pirko <jpirko@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 ab16ebf3
......@@ -2450,6 +2450,11 @@ static inline void netif_addr_lock(struct net_device *dev)
spin_lock(&dev->addr_list_lock);
}
static inline void netif_addr_lock_nested(struct net_device *dev)
{
spin_lock_nested(&dev->addr_list_lock, SINGLE_DEPTH_NESTING);
}
static inline void netif_addr_lock_bh(struct net_device *dev)
{
spin_lock_bh(&dev->addr_list_lock);
......
......@@ -439,11 +439,11 @@ int dev_uc_sync(struct net_device *to, struct net_device *from)
if (to->addr_len != from->addr_len)
return -EINVAL;
netif_addr_lock_bh(to);
netif_addr_lock_nested(to);
err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len);
if (!err)
__dev_set_rx_mode(to);
netif_addr_unlock_bh(to);
netif_addr_unlock(to);
return err;
}
EXPORT_SYMBOL(dev_uc_sync);
......@@ -463,7 +463,7 @@ void dev_uc_unsync(struct net_device *to, struct net_device *from)
return;
netif_addr_lock_bh(from);
netif_addr_lock(to);
netif_addr_lock_nested(to);
__hw_addr_unsync(&to->uc, &from->uc, to->addr_len);
__dev_set_rx_mode(to);
netif_addr_unlock(to);
......@@ -602,11 +602,11 @@ int dev_mc_sync(struct net_device *to, struct net_device *from)
if (to->addr_len != from->addr_len)
return -EINVAL;
netif_addr_lock_bh(to);
netif_addr_lock_nested(to);
err = __hw_addr_sync(&to->mc, &from->mc, to->addr_len);
if (!err)
__dev_set_rx_mode(to);
netif_addr_unlock_bh(to);
netif_addr_unlock(to);
return err;
}
EXPORT_SYMBOL(dev_mc_sync);
......@@ -626,7 +626,7 @@ void dev_mc_unsync(struct net_device *to, struct net_device *from)
return;
netif_addr_lock_bh(from);
netif_addr_lock(to);
netif_addr_lock_nested(to);
__hw_addr_unsync(&to->mc, &from->mc, to->addr_len);
__dev_set_rx_mode(to);
netif_addr_unlock(to);
......
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