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Register netlink protocol handlers for message types RTM_NEWTFILTER, RTM_DELTFILTER, RTM_GETTFILTER as unlocked. Set rtnl_held variable that tracks rtnl mutex state to be false by default. Introduce tcf_proto_is_unlocked() helper that is used to check tcf_proto_ops->flag to determine if ops can be called without taking rtnl lock. Manually lookup Qdisc, class and block in rule update handlers. Verify that both Qdisc ops and proto ops are unlocked before using any of their callbacks, and obtain rtnl lock otherwise. Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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