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Date: Tue, 11 Feb 2020 11:19:16 +0200 From: Vlad Buslov <vladbu@...lanox.com> To: netdev@...r.kernel.org, davem@...emloft.net Cc: jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us, pablo@...filter.org, marcelo.leitner@...il.com, Vlad Buslov <vladbu@...lanox.com>, Jiri Pirko <jiri@...lanox.com> Subject: [PATCH net-next 2/4] net: sched: refactor police action helpers to require tcf_lock In order to remove rtnl lock dependency from flow_action representation translator, change rcu_dereference_bh_rtnl() to rcu_dereference_protected() in police action helpers that provide external access to rate and burst values. This is safe to do because the functions are not called from anywhere else outside flow_action infrastructure which was modified to obtain tcf_lock when accessing action data in one of previous patches in the series. Signed-off-by: Vlad Buslov <vladbu@...lanox.com> Acked-by: Jiri Pirko <jiri@...lanox.com> --- include/net/tc_act/tc_police.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/include/net/tc_act/tc_police.h b/include/net/tc_act/tc_police.h index cfdc7cb82cad..f098ad4424be 100644 --- a/include/net/tc_act/tc_police.h +++ b/include/net/tc_act/tc_police.h @@ -54,7 +54,8 @@ static inline u64 tcf_police_rate_bytes_ps(const struct tc_action *act) struct tcf_police *police = to_police(act); struct tcf_police_params *params; - params = rcu_dereference_bh_rtnl(police->params); + params = rcu_dereference_protected(police->params, + lockdep_is_held(&police->tcf_lock)); return params->rate.rate_bytes_ps; } @@ -63,7 +64,8 @@ static inline s64 tcf_police_tcfp_burst(const struct tc_action *act) struct tcf_police *police = to_police(act); struct tcf_police_params *params; - params = rcu_dereference_bh_rtnl(police->params); + params = rcu_dereference_protected(police->params, + lockdep_is_held(&police->tcf_lock)); return params->tcfp_burst; } -- 2.21.0
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