[PATCH net-next] net_sched: no need to free qdisc in RCU callback

[Cong Wang]

gen estimator has been rewritten in commit 1c0d32fde5bd
("net_sched: gen_estimator: complete rewrite of rate estimators"),
the caller no longer needs to wait for a grace period. So this
patch gets rid of it.

Cc: Jamal Hadi Salim <j...@mojatatu.com>
Cc: Eric Dumazet <eduma...@google.com>
Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
---
 include/net/sch_generic.h |  1 -
 net/sched/sch_generic.c   | 10 ++--------
 2 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 135f5a2dd931..684d8ed27eaa 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -93,7 +93,6 @@ struct Qdisc {
        unsigned long           state;
        struct Qdisc            *next_sched;
        struct sk_buff          *skb_bad_txq;
-       struct rcu_head         rcu_head;
        int                     padded;
        refcount_t              refcnt;
 
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 92237e75dbbc..1fb0c754b7fd 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -688,10 +688,8 @@ void qdisc_reset(struct Qdisc *qdisc)
 }
 EXPORT_SYMBOL(qdisc_reset);
 
-static void qdisc_rcu_free(struct rcu_head *head)
+static void qdisc_free(struct Qdisc *qdisc)
 {
-       struct Qdisc *qdisc = container_of(head, struct Qdisc, rcu_head);
-
        if (qdisc_is_percpu_stats(qdisc)) {
                free_percpu(qdisc->cpu_bstats);
                free_percpu(qdisc->cpu_qstats);
@@ -724,11 +722,7 @@ void qdisc_destroy(struct Qdisc *qdisc)
 
        kfree_skb_list(qdisc->gso_skb);
        kfree_skb(qdisc->skb_bad_txq);
-       /*
-        * gen_estimator est_timer() might access qdisc->q.lock,
-        * wait a RCU grace period before freeing qdisc.
-        */
-       call_rcu(&qdisc->rcu_head, qdisc_rcu_free);
+       qdisc_free(qdisc);
 }
 EXPORT_SYMBOL(qdisc_destroy);
 
-- 
2.13.0