linux-kernel - Re: [PATCH RFC] dmaengine: dw: Prevent tx-status calling desc callback (Fix UART deadlock!)

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Message-ID: <CAHp75VdXqS6xqdsQCyhaMNLvzwkFn9HU8k9SLcT=KSwF9QPN4Q@mail.gmail.com>
Date: Fri, 23 Aug 2024 16:21:24 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Serge Semin <fancer.lancer@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jirislaby@...nel.org>, 
	Andy Shevchenko <andy@...nel.org>, Viresh Kumar <vireshk@...nel.org>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Vinod Koul <vkoul@...nel.org>, 
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	dmaengine@...r.kernel.org, linux-serial@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] dmaengine: dw: Prevent tx-status calling desc
 callback (Fix UART deadlock!)

On Fri, Aug 23, 2024 at 12:48 PM Serge Semin <fancer.lancer@...il.com> wrote:
>
> Hi folks
>
> Any comments or suggestion about the change? The kernel occasionally
> _deadlocks_ without it for the DW UART + DW DMAC hardware setup.

I have no time to look at that, but FWIW with a stress tests on older
machines I have seen something similar from time to time (less than
10% reproducibility ration IIRC).

P.S. Is there is any possibility to have a step-by-step reproducer?
Also can we utilise (and update if needed) the open source project
https://github.com/cbrake/linux-serial-test?

-- 
With Best Regards,
Andy Shevchenko