net: sched: flower: don't check for rtnl on head dereference

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Flower classifier only changes root pointer during init and destroy. Cls
API implements reference counting for tcf_proto, so there is no danger of
concurrent access to tp when it is being destroyed, even without protection
provided by rtnl lock.

Implement new function fl_head_dereference() to dereference tp->root
without checking for rtnl lock. Use it in all flower function that obtain
head pointer instead of rtnl_dereference().

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Vlad Buslov 2019-03-21 15:17:33 +02:00 • committed by David S. Miller

parent 31f1a0e37c

commit e474619a24

1 changed files with 17 additions and 7 deletions

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net/sched/cls_flower.c

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