netdev - Re: [PATCH net v3] net/sched: cbs: Fix not adding cbs instance to list

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Date:   Thu, 26 Sep 2019 09:04:30 +0200 (CEST)
From:   David Miller <davem@...emloft.net>
To:     vinicius.gomes@...el.com
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us
Subject: Re: [PATCH net v3] net/sched: cbs: Fix not adding cbs instance to
 list

From: Vinicius Costa Gomes <vinicius.gomes@...el.com>
Date: Mon, 23 Sep 2019 22:04:58 -0700

> When removing a cbs instance when offloading is enabled, the crash
> below can be observed.
> 
> The problem happens because that when offloading is enabled, the cbs
> instance is not added to the list.
> 
> Also, the current code doesn't handle correctly the case when offload
> is disabled without removing the qdisc: if the link speed changes the
> credit calculations will be wrong. When we create the cbs instance
> with offloading enabled, it's not added to the notification list, when
> later we disable offloading, it's not in the list, so link speed
> changes will not affect it.
> 
> The solution for both issues is the same, add the cbs instance being
> created unconditionally to the global list, even if the link state
> notification isn't useful "right now".
> 
> Crash log:
 ...
> Fixes: e0a7683 ("net/sched: cbs: fix port_rate miscalculation")

Please use 12 significant digits for SHA1 IDs in the future in Fixes:
tags.

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

Applied and queued up for -stable.