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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2022-09-15 13:50:41 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-09-20 13:53:33 -0700 |
| commit | 18cdd2f0998a4967b1fff4c43ed9aef049e42c39 (patch) | |
| tree | a19ae3b08021e0043a63bca9dd7f271cc16ee868 /net | |
| parent | c8cbe123be6de9deff5e5312af8848362a919f97 (diff) | |
| download | linux-18cdd2f0998a4967b1fff4c43ed9aef049e42c39.tar.bz2 | |
net/sched: taprio: taprio_dump and taprio_change are protected by rtnl_mutex
Since the writer-side lock is taken here, we do not need to open an RCU
read-side critical section, instead we can use rtnl_dereference() to
tell lockdep we are serialized with concurrent writes.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/sch_taprio.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c index e9f57ef7bc17..017ccf5431aa 100644 --- a/net/sched/sch_taprio.c +++ b/net/sched/sch_taprio.c @@ -1484,10 +1484,8 @@ static int taprio_change(struct Qdisc *sch, struct nlattr *opt, } INIT_LIST_HEAD(&new_admin->entries); - rcu_read_lock(); - oper = rcu_dereference(q->oper_sched); - admin = rcu_dereference(q->admin_sched); - rcu_read_unlock(); + oper = rtnl_dereference(q->oper_sched); + admin = rtnl_dereference(q->admin_sched); /* no changes - no new mqprio settings */ if (!taprio_mqprio_cmp(dev, mqprio)) @@ -1878,9 +1876,8 @@ static int taprio_dump(struct Qdisc *sch, struct sk_buff *skb) struct nlattr *nest, *sched_nest; unsigned int i; - rcu_read_lock(); - oper = rcu_dereference(q->oper_sched); - admin = rcu_dereference(q->admin_sched); + oper = rtnl_dereference(q->oper_sched); + admin = rtnl_dereference(q->admin_sched); opt.num_tc = netdev_get_num_tc(dev); memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map)); @@ -1924,8 +1921,6 @@ static int taprio_dump(struct Qdisc *sch, struct sk_buff *skb) nla_nest_end(skb, sched_nest); done: - rcu_read_unlock(); - return nla_nest_end(skb, nest); admin_error: @@ -1935,7 +1930,6 @@ options_error: nla_nest_cancel(skb, nest); start_error: - rcu_read_unlock(); return -ENOSPC; } |