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net_sched: introduce qdisc_replace() helper

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Remove nearly duplicated code and prepare for the following patch.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong
2016-02-25 14:55:00 -08:00
committed by David S. Miller
parent f12d33f4d8
commit 86a7996cc8
13 changed files with 29 additions and 78 deletions
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17
include/net/sch_generic.h
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@@ -707,6 +707,23 @@ static inline void qdisc_reset_queue(struct Qdisc *sch)
sch->qstats.backlog = 0;
}
static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
struct Qdisc **pold)
{
struct Qdisc *old;
sch_tree_lock(sch);
old = *pold;
*pold = new;
if (old != NULL) {
qdisc_tree_decrease_qlen(old, old->q.qlen);
qdisc_reset(old);
}
sch_tree_unlock(sch);
return old;
}
static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
struct sk_buff_head *list)
{