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

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Message-ID: <035501d0f9be$8ef49340$acddb9c0$@tangramtek.com>
Date:	Mon, 28 Sep 2015 15:23:20 +0800
From:	"yitian" <yitian.bu@...gramtek.com>
To:	"'Andy Shevchenko'" <andy.shevchenko@...il.com>,
	"'Viresh Kumar'" <viresh.kumar@...aro.org>
Cc:	"'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 lock when audio playback

> 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.
I am waiting for your further guide.
Thanks.

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