netdev - Re: [PATCH v2 net 1/3] taprio: Fix kernel panic in taprio

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Date:   Fri, 30 Aug 2019 15:30:17 -0700
From:   Vinicius Costa Gomes <vinicius.gomes@...el.com>
To:     Vladimir Oltean <olteanv@...il.com>, xiyou.wangcong@...il.com,
        jiri@...nulli.us, davem@...emloft.net, vedang.patel@...el.com,
        leandro.maciel.dorileo@...el.com
Cc:     netdev@...r.kernel.org, Vladimir Oltean <olteanv@...il.com>
Subject: Re: [PATCH v2 net 1/3] taprio: Fix kernel panic in taprio_destroy

Vladimir Oltean <olteanv@...il.com> writes:

> taprio_init may fail earlier than this line:
>
> 	list_add(&q->taprio_list, &taprio_list);
>
> i.e. due to the net device not being multi queue.
>
> Attempting to remove q from the global taprio_list when it is not part
> of it will result in a kernel panic.
>
> Fix it by matching list_add and list_del better to one another in the
> order of operations. This way we can keep the deletion unconditional
> and with lower complexity - O(1).
>
> Cc: Leandro Dorileo <leandro.maciel.dorileo@...el.com>
> Fixes: 7b9eba7ba0c1 ("net/sched: taprio: fix picos_per_byte miscalculation")
> Signed-off-by: Vladimir Oltean <olteanv@...il.com>
> ---

Acked-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>