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The bond_activebackup_arp_mon() use the bond lock for read to
protect the slave list, it is no effect, and the RTNL is only
called for bond_ab_arp_commit() and peer notify, for the performance
better, use RCU to replace with the bond lock, to the bond slave
list need to called in RCU, add a new bond_first_slave_rcu()
to get the first slave in RCU protection.
In bond_ab_arp_probe(), the bond->current_arp_slave may changd
if bond release slave, just like:
bond_ab_arp_probe() bond_release()
cpu 0 cpu 1
...
if (bond->current_arp_slave...) ...
... bond->current_arp_slave = NULl
bond->current_arp_slave->dev->name ...
So the current_arp_slave need to dereference in the section.
Suggested-by: Nikolay Aleksandrov <nikolay@redhat.com>
Suggested-by: Jay Vosburgh <fubar@us.ibm.com>
Suggested-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
eb9fa4b019