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Message-ID: <1443429967.8361.227.camel@linux.intel.com>
Subject: Re: [PATCH 1/1] dmaengine: dw: resolve recursion lock when audio
 playback
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: yitian <yitian.bu@tangramtek.com>,
        "'Andy Shevchenko'" <andy.shevchenko@gmail.com>,
        "'Viresh Kumar'" <viresh.kumar@linaro.org>
Cc: "'Viresh Kumar'" <vireshk@kernel.org>,
        "'Vinod Koul'" <vinod.koul@intel.com>,
        "'Dan Williams'" <dan.j.williams@intel.com>,
        "'dmaengine'" <dmaengine@vger.kernel.org>,
        "'Linux Kernel Mailing List'" <linux-kernel@vger.kernel.org>
Date: Mon, 28 Sep 2015 11:46:07 +0300
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On Mon, 2015-09-28 at 15:23 +0800, yitian wrote:
> > 
> > From: Andy Shevchenko [mailto:andy.shevchenko@gmail.com]
> > Sent: Monday, September 28, 2015 3:06 PM
> > To: Viresh Kumar <viresh.kumar@linaro.org>
> > Cc: yitian <yitian.bu@tangramtek.com>; Viresh Kumar
> > <vireshk@kernel.org>; Andy Shevchenko
> > <andriy.shevchenko@linux.intel.com>; Vinod Koul <
> > vinod.koul@intel.com>;
> > Dan Williams <dan.j.williams@intel.com>; dmaengine
> > <dmaengine@vger.kernel.org>; Linux Kernel Mailing List
> > <linux-kernel@vger.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@linux.intel.com>
Intel Finland Oy