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

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Message-ID: <3deb16a8-bdb1-3c31-2722-404f271f41d8@huawei.com>
Date:   Tue, 10 Nov 2020 08:58:17 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
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 2020/11/9 20:46, Greg KH wrote:
> 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?

4.19.x and 5.4.x

Thanks

> 
> thanks,
> 
> greg k-h
> .
>