回合3个解决bonding oops问题的补丁

1、bonding: 3ad: Fix the conflict between bond_update_slave_arr and the state machine
commit_id=83d686a6822322c4981b745dc1d7185f1f40811b
链接：https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=83d686a6822322c4981b745dc1d7185f1f40811b
Test commands:
ifconfig bond1 down
ifconfig bond1 up
频繁执行如上命令时，多cpu并发执行时，有可能出现执行先后顺序不一致，导致访问到了空指针的情况，此补丁增加了lock保护其先后执行顺序，已合入linux主线；

2、bonding: avoid adding slave device with IFF_MASTER flag
bonding: allow nesting of bonding device
这2个补丁是一起的，解决将VRF等master类型的设备加入bonding后出现的oops问题
Reference:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3c9ef511b9fa128a4c62e3aa0aac4c6b190f0d55
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4d293fe1c69c157c15ac06918a805e5fef036682
Test commands:
ip link add vrf1 type vrf table 1
modprobe bonding.ko max_bonds=1
echo "+vrf1" >/sys/class/net/bond0/bonding/slaves
rmmod bonding
必现

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