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

[yitian]

> From: Andy Shevchenko [mailto:andy.shevchenko@xxxxxxxxx]
> Sent: Monday, September 28, 2015 3:06 PM
> To: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
> Cc: yitian <yitian.bu@xxxxxxxxxxxxxx>; Viresh Kumar
> <vireshk@xxxxxxxxxx>; Andy Shevchenko
> <andriy.shevchenko@xxxxxxxxxxxxxxx>; Vinod Koul <vinod.koul@xxxxxxxxx>;
> Dan Williams <dan.j.williams@xxxxxxxxx>; dmaengine
> <dmaengine@xxxxxxxxxxxxxxx>; Linux Kernel Mailing List
> <linux-kernel@xxxxxxxxxxxxxxx>
> 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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