linux-kernel - Re: [PATCH 1/1] dmaengine: dw: resolve recursion lock when audio playback

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Date:	Mon, 28 Sep 2015 11:46:07 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	yitian <yitian.bu@...gramtek.com>,
	'Andy Shevchenko' <andy.shevchenko@...il.com>,
	'Viresh Kumar' <viresh.kumar@...aro.org>
Cc:	'Viresh Kumar' <vireshk@...nel.org>,
	'Vinod Koul' <vinod.koul@...el.com>,
	'Dan Williams' <dan.j.williams@...el.com>,
	'dmaengine' <dmaengine@...r.kernel.org>,
	'Linux Kernel Mailing List' <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] dmaengine: dw: resolve recursion lock when audio
 playback

On Mon, 2015-09-28 at 15:23 +0800, yitian wrote:
> > 
> > From: Andy Shevchenko [mailto:andy.shevchenko@...il.com]
> > Sent: Monday, September 28, 2015 3:06 PM
> > To: Viresh Kumar <viresh.kumar@...aro.org>
> > Cc: yitian <yitian.bu@...gramtek.com>; Viresh Kumar
> > <vireshk@...nel.org>; Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com>; Vinod Koul <
> > vinod.koul@...el.com>;
> > Dan Williams <dan.j.williams@...el.com>; dmaengine
> > <dmaengine@...r.kernel.org>; Linux Kernel Mailing List
> > <linux-kernel@...r.kernel.org>
> > Subject: Re: [PATCH 1/1] dmaengine: dw: resolve recursion 
> > > I am not sure if this is a sane way of doing that, and we were 
> > > scanning
> > > the descriptors for some valid reason..
> > 
> > Actually one of the patches in a pile sitting in my private repo is
> > also including similar change. In my case the reason is to support
> > cyclic transfers natively.
> > 
> 
> Yes, i am using DW DMAC to support cyclic transfer.
> Currently it is very easy to get recursion lock crash, but
> after this patch everything is fine on my device.

What is an actual hardware you are running kernel on?

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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