linux-kernel - Re: dmaengine: CPU stalls while loading bluetooth module

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Message-ID: <2b2a6c9f-4df2-4962-b926-09adccd20715@leemhuis.info>
Date: Thu, 28 Mar 2024 16:06:28 +0100
From: "Linux regression tracking (Thorsten Leemhuis)"
 <regressions@...mhuis.info>
To: Vinod Koul <vkoul@...nel.org>,
 Linux regressions mailing list <regressions@...ts.linux.dev>
Cc: dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
 parthiban@...umiz.com, saravanan@...umiz.com,
 'karthikeyan' <karthikeyan@...umiz.com>,
 "bumyong.lee" <bumyong.lee@...sung.com>
Subject: Re: dmaengine: CPU stalls while loading bluetooth module

On 28.03.24 07:51, Vinod Koul wrote:
> On 26-03-24, 14:50, Linux regression tracking (Thorsten Leemhuis) wrote:
>> Hi, Thorsten here, the Linux kernel's regression tracker. Top-posting
>> for once, to make this easily accessible to everyone.
>>
>> Vinod Koul, what's your option here? We have two reports about
>> regressions caused by 22a9d958581244 ("dmaengine: pl330: issue_pending
>> waits until WFP state") [v6.8-rc1] now:
>>
>> https://lore.kernel.org/lkml/1553a526-6f28-4a68-88a8-f35bd22d9894@linumiz.com/
>>
>> https://lore.kernel.org/all/ZYhQ2-OnjDgoqjvt@wens.tw/
>> [the first link points to the start of this thread]
>>
>> To me it sounds like this is a change that better should be reverted,
>> but you are of course the better judge here.
> 
> Sure I have reverted this,

Thx!

> so original issue exist as is now...

Yeah, that's a downside, but that's afaik how Linus wants these
situations to be handled. Hopefully it will motivate someone to fix the
original issue without causing a regression.

Thx again! Ciao, Thorsten

P.S.:

#regzbot fix: dmaengine: Revert "dmaengine: pl330: issue_pending waits
until WFP state"

(that's
https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git/commit/?h=fixes&id=afc89870ea677bd5a44516eb981f7a259b74280c
currently)