netdev - Re: [PATCH net 2/2] net: dsa: b53: Set correct number of ports in the DSA struct

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Message-ID: <6411c7dd-79b4-3659-020b-aaa929447d50@gmail.com>
Date:   Wed, 1 Sep 2021 18:38:47 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Rafał Miłecki <zajec5@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>,
        stable@...r.kernel.org
Subject: Re: [PATCH net 2/2] net: dsa: b53: Set correct number of ports in the
 DSA struct



On 9/1/2021 4:36 PM, Jakub Kicinski wrote:
> On Wed, 1 Sep 2021 10:21:55 -0700 Florian Fainelli wrote:
>> On 9/1/2021 2:21 AM, Rafał Miłecki wrote:
>>> From: Rafał Miłecki <rafal@...ecki.pl>
>>>
>>> Setting DSA_MAX_PORTS caused DSA to call b53 callbacks (e.g.
>>> b53_disable_port() during dsa_register_switch()) for invalid
>>> (non-existent) ports. That made b53 modify unrelated registers and is
>>> one of reasons for a broken BCM5301x support.
>>>
>>> This problem exists for years but DSA_MAX_PORTS usage has changed few
>>> times so it's hard to specify a single commit this change fixes.
>>
>> You should still try to identify the relevant tags that this is fixing
>> such that this gets back ported to the appropriate trees. We could use
>> Fixes: 7e99e3470172 ("net: dsa: remove dsa_switch_alloc helper"), to
>> minimize the amount of work doing the back port.
> 
> To be clear are you okay with the fixes tag you provided or should we
> wait for Rafał to double check?

That Fixes tag is correct and won't cause conflicts AFAICT with 
backports all the way down to that commit.
-- 
Florian