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

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Message-ID: <001001da7a60$78603130$69209390$@samsung.com>
Date: Wed, 20 Mar 2024 09:49:31 +0900
From: "bumyong.lee" <bumyong.lee@...sung.com>
To: "'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>, <vkoul@...nel.org>
Subject: RE: dmaengine: CPU stalls while loading bluetooth module

Hello.

> >> Hmmm. 6.8 final is due. Is that something we can live with? Or would
> >> it be a good idea to revert above commit for now and reapply it when
> >> something better emerged? I doubt that the answer is "yes, let's do
> >> that", but I have to ask.
> >
> > I couldn't find better way now.
> > I think it's better to follow you mentioned
> 
> 6.8 is out, but that issue afaics was not resolved, so allow me to ask:
> did "submit a revert" fell through the cracks or is there some other
> solution in the works? Or am I missing something?

"submit a revert" would fix the issue. but it would make another issue
that the errata[1] 719340 described.

Sometimes dma wouldn't work well when issueing dma_issue_pending()
after dma_terminate()

Best regards

[1]: https://developer.arm.com/documentation/genc008428/latest