linux-kernel - Re: [PATCH v3 01/15] dmaengine: dw: fix master selection

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Date:	Wed, 13 Apr 2016 16:36:56 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	"Koul, Vinod" <vinod.koul@...el.com>,
	"andy.shevchenko@...il.com" <andy.shevchenko@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"vireshk@...nel.org" <vireshk@...nel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"vgupta@...opsys.com" <vgupta@...opsys.com>,
	"tj@...nel.org" <tj@...nel.org>,
	"egtvedt@...fundet.no" <egtvedt@...fundet.no>
Subject: Re: [PATCH v3 01/15] dmaengine: dw: fix master selection

On Wed, 2016-04-06 at 21:09 +0000, Koul, Vinod wrote:
> On Wed, 2016-04-06 at 22:56 +0300, Andy Shevchenko wrote:
> > 
> > On Wed, Apr 6, 2016 at 9:56 PM, Vinod Koul <vinod.koul@...el.com>
> > wrote:
> > > 
> > > On Mon, Apr 04, 2016 at 08:10:54PM +0300, Andy Shevchenko wrote:
> > > > 
> > > > On Mon, 2016-04-04 at 10:03 -0700, Vinod Koul wrote:
> > > > > 
> > > > > On Fri, Mar 18, 2016 at 04:24:40PM +0200, Andy Shevchenko
> > > > > wrote:
> > > > > > 
> > > > > > 
> > > > > > + /*
> > > > > > +  * We need controller-specific data to set up slave
> > > > > > transfers.
> > > > > > +  */
> > > > > > + BUG_ON(chan->private && !dw_dma_filter(chan, chan-
> > > > > > > 
> > > > > > > private));
> > > > > I don't think BUG_ON is apt here, gracefully failing and
> > > > > printing
> > > > > that can
> > > > > be better..
> > > > Hm, this is coming from the existing code.
> > > > 
> > > > I would prefer to keep this one as is since it's targeted to
> > > > stable@,
> > > > and I may issue sequential patch to replace BUG_ON. Sounds okay?
> > > But since this is going stable, how about we remove here in the
> > > patch and
> > > benefit stable tree as well?
> > I'm fine with that. I will send you patch tomorrow.Other than that
> > do
> > we have any issues with the rest?
> I did look at few more they looked fine, but didn't look at entire
> series

I've sent an update to patch 1 with "PATCH v3.5" in the subject.

Anything else should I do?

At least Intel Quark UART series (published) and SATA DWC 460ex (not
published in mailing list yet) are relying on this. It would be nice to
have immutable branch as soon as everything okay with the series.

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