linux-kernel - Re: [PATCH 0/4] serial: fsl_lpuart: fix various DMA related issues

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Date:	Fri, 12 Dec 2014 17:19:02 +0100
From:	Stefan Agner <stefan@...er.ch>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	jslaby@...e.cz, jingchang.lu@...escale.com, shawn.guo@...aro.org,
	linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] serial: fsl_lpuart: fix various DMA related issues

On 2014-12-12 15:32, Greg KH wrote:
> On Fri, Dec 12, 2014 at 02:44:06PM +0100, Stefan Agner wrote:
>> Any thoughts on this patchset? Would have hopped that it makes it into
>> 3.19 as those are mostly fixes.
> 
> "mostly"?
> 

Well, all of them fix a bug, but PATCH 2/4 does this by also moving DMA
allocation to probe. I would really have to split up that patch and make
two incremental steps (split-up of RX/TX DMA allocation to make each
single action revert-able and move to probe). But this would lead to
more changed lines in total. The patchset as is already somewhat tested
since we use it in our 3.18 BSP, whereas a new set would not be tested.

One could also argument, it only affects fsl_lpuart (UART in rather not
very widespread SoC's Freescale Vybrid and LS1021a).

> I'll get to these after 3.19-rc1 is out, but it really looks like these
> will be for 3.20-rc1, unless you break them up into "bugfix only" type
> patches.

PATCH 1/4 fixes a bug which happens on a normal console rather often on
my setup. So if you decide that patchset is for 3.20-rc1, that one would
be nice to have in 3.19 as well...

--
Stefan

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