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net: introduce netif_addr_lock_nested() and call if when appropriate

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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: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko
2012-01-09 06:36:54 +00:00
committed by David S. Miller
parent ab16ebf375
commit 2429f7ac2e
2 changed files with 11 additions and 6 deletions
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5
include/linux/netdevice.h
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@@ -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);