linux-kernel - Re: [PATCH] Revert "mt76: mt7921: enable aspm by default"

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Date:   Tue, 12 Apr 2022 13:33:52 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Thorsten Leemhuis <regressions@...mhuis.info>
Cc:     Philippe Schenker <dev@...henker.ch>,
        linux-wireless@...r.kernel.org, Felix Fietkau <nbd@....name>,
        "David S. Miller" <davem@...emloft.net>,
        Deren Wu <deren.wu@...iatek.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Shayne Chen <shayne.chen@...iatek.com>,
        YN Chen <YN.Chen@...iatek.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org,
        "regressions\@lists.linux.dev" <regressions@...ts.linux.dev>
Subject: Re: [PATCH] Revert "mt76: mt7921: enable aspm by default"

Thorsten Leemhuis <regressions@...mhuis.info> writes:

> On 12.04.22 11:37, Kalle Valo wrote:
>> Philippe Schenker <dev@...henker.ch> writes:
>> 
>>> This reverts commit bf3747ae2e25dda6a9e6c464a717c66118c588c8.
>>>
>>> This commit introduces a regression on some systems where the kernel is
>>> crashing in different locations after a reboot was issued.
>>>
>>> This issue was bisected on a Thinkpad P14s Gen2 (AMD) with latest firmware.
>>>
>>> Link:
>>> https://lore.kernel.org/linux-wireless/5077a953487275837e81bdf1808ded00b9676f9f.camel@pschenker.ch/
>>> Signed-off-by: Philippe Schenker <dev@...henker.ch>
>> 
>> Can I take this to wireless tree? Felix, ack?
>> 
>> I'll also add:
>> 
>> Fixes: bf3747ae2e25 ("mt76: mt7921: enable aspm by default")
>
> Sorry, stupid questions from the regression tracker: wouldn't this cause
> a regression for users of kernel versions post-bf3747ae2e25, as the
> power consumption is likely to increase for them? Without having dug
> into the backstory much: would disabling ASPM for this particular
> machine using a quirk be the better approach? Or are we assuming a lot
> of machines are affected?

Kernel crashing is far more serious than increased power consumption. If
there's a better fix available in the next day or two of course that can
be considered. But if there's no such fix available, we have to revert
the commit.

-- 
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