linux-kernel - Re: [PATCH v11 0/2] Add support for the Allwinner A31 DMA Controller

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Message-ID: <20140725163746.GC20328@lukather>
Date:	Fri, 25 Jul 2014 18:37:46 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...glegroups.com, kevin.z.m.zh@...il.com,
	sunny@...winnertech.com, shuge@...winnertech.com,
	zhuzhenhua@...winnertech.com, Arnd Bergmann <arnd@...db.de>,
	andriy.shevchenko@...el.com, dmaengine@...r.kernel.org
Subject: Re: [PATCH v11 0/2] Add support for the Allwinner A31 DMA Controller

Hi Vinod,

On Fri, Jul 25, 2014 at 06:42:17PM +0530, Vinod Koul wrote:
> On Thu, Jul 17, 2014 at 09:46:14PM +0200, Maxime Ripard wrote:
> > Hi,
> > 
> > This patchset adds support for the DMA controller found in the
> > Allwinner A31 and A23 SoCs.
> > 
> > This has been tested using the newly introduced SPI driver on an A31
> > EVK. Support for DMA-driven SPI transfers will be the subject of
> > another patch serie.
> > 
> > This has been around for around 5 monthes now, and didn't get any
> > review but nitpicks for three versions, so I feel like it could be
> > merged quite quickly.
> I have applied this now.

Thanks.

> Can you please send follow patches for these:
> - don't recall if I pointed earlier, but can we use direct conversion for
>   calculating convert_burst() and convert_buswidth(), latter one at least
>   seem doable

Ok. Do you still want the error reporting for the invalid width and
burst size?

> - don't use devm_request_irq(). You have irq enabled and you have killed
>   tasklet. This is too racy. You need to ensure no irqs can be generated before killing
>   tasklets.

Ok, would calling disable_irq before killing the tasklet an option for
you ? that would allow to keep the devm_request_irq.

> - use synchronize_irq() before killing tasklet

Actually, I already do it, like you suggested previously. See
sun6i_kill_tasklet.

I'll also send patches for the various breakages and warnings spotted
by the autobuilders.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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