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net: sched: prio: delay destroying child qdiscs on change 

Move destroying of the old child qdiscs outside of the sch_tree_lock()
section.  This should improve the software qdisc replace but is even
more important for offloads.  Calling offloads under a spin lock is
best avoided, and child's destroy would be called under sch_tree_lock().

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2018-11-07 17:33:40 -08:00 committed by David S. Miller
parent 0c8d13ac96
commit 7b8e0b6e65
1 changed files with 3 additions and 1 deletions
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4
net/sched/sch_prio.c
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@ -220,7 +220,6 @@ static int prio_tune(struct Qdisc *sch, struct nlattr *opt,
qdisc_tree_reduce_backlog(child, child->q.qlen,
child->qstats.backlog);
qdisc_put(child);
}
for (i = oldbands; i < q->bands; i++) {
@ -230,6 +229,9 @@ static int prio_tune(struct Qdisc *sch, struct nlattr *opt,
}
sch_tree_unlock(sch);
for (i = q->bands; i < oldbands; i++)
qdisc_put(q->queues[i]);
return 0;
}