From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Wed, 7 Nov 2018 17:33:40 -0800
Subject: net: sched: prio: delay destroying child qdiscs on change
Patch-mainline: v5.0-rc1
Git-commit: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7
References: bsc#1109837
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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
net/sched/sch_prio.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -220,7 +220,6 @@ static int prio_tune(struct Qdisc *sch,
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,
}
sch_tree_unlock(sch);
+
+ for (i = q->bands; i < oldbands; i++)
+ qdisc_put(q->queues[i]);
return 0;
}