linux-kernel - Re: [PATCH stable] net: sch_generic: fix the missing new qdisc assignment bug

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Message-ID: <20201109124658.GC1834954@kroah.com>
Date:   Mon, 9 Nov 2020 13:46:58 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yunsheng Lin <linyunsheng@...wei.com>
Cc:     stable@...r.kernel.org, vpai@...mai.com,
        Joakim.Tjernlund@...inera.com, xiyou.wangcong@...il.com,
        johunt@...mai.com, jhs@...atatu.com, jiri@...nulli.us,
        davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxarm@...wei.com,
        john.fastabend@...il.com, eric.dumazet@...il.com, dsahern@...il.com
Subject: Re: [PATCH stable] net: sch_generic: fix the missing new qdisc
 assignment bug

On Tue, Nov 03, 2020 at 11:25:38AM +0800, Yunsheng Lin wrote:
> commit 2fb541c862c9 ("net: sch_generic: aviod concurrent reset and enqueue op for lockless qdisc")
> 
> When the above upstream commit is backported to stable kernel,
> one assignment is missing, which causes two problems reported
> by Joakim and Vishwanath, see [1] and [2].
> 
> So add the assignment back to fix it.
> 
> 1. https://www.spinics.net/lists/netdev/msg693916.html
> 2. https://www.spinics.net/lists/netdev/msg695131.html
> 
> Fixes: 749cc0b0c7f3 ("net: sch_generic: aviod concurrent reset and enqueue op for lockless qdisc")
> Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
> ---
>  net/sched/sch_generic.c | 3 +++
>  1 file changed, 3 insertions(+)

What kernel tree(s) does this need to be backported to?

thanks,

greg k-h