From: Konstantin Khlebnikov
Date: Tue, 15 Aug 2017 16:39:05 +0300
> It was added in commit e57a784d8cae ("pkt_sched: set root qdisc
> before change() in attach_default_qdiscs()") to hide duplicates
> from "tc qdisc show" for incative deivices.
>
> After 59cc1f61f ("net: sched: convert qdisc link
It was added in commit e57a784d8cae ("pkt_sched: set root qdisc
before change() in attach_default_qdiscs()") to hide duplicates
from "tc qdisc show" for incative deivices.
After 59cc1f61f ("net: sched: convert qdisc linked list to hashtable")
it triggered when classful qdisc is added to inactive d
