From: Cong Wang <xiyou.wangc...@gmail.com>
Date: Tue, 26 May 2015 16:08:48 -0700
> For mq qdisc, we add per tx queue qdisc to root qdisc
> for display purpose, however, that happens too early,
> before the new dev->qdisc is finally set, this causes
> q->list points to an old root qdisc which is going to be
> freed right before assigning with a new one.
>
> Fix this by moving ->attach() after setting dev->qdisc.
>
> For the record, this fixes the following crash:
...
> For long term, we probably need to clean up the qdisc_graft() code
> in case it hides other bugs like this.
>
> Fixes: 95dc19299f74 ("pkt_sched: give visibility to mq slave qdiscs")
> Cc: Jamal Hadi Salim <j...@mojatatu.com>
> Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
Applied, and queued up for -stable, thanks!
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