linux-kernel - Re: [PATCH 1/1] ARM: exynos_defconfig: Disable IOMMU support

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Date:	Fri, 06 Mar 2015 16:07:08 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Inki Dae <inki.dae@...sung.com>
CC:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kevin Hilman <khilman@...nel.org>,
	Kukjin Kim <kgene@...nel.org>, Olof Johansson <olof@...om.net>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Andreas Faerber <afaerber@...e.de>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	tyler.baker@...aro.org, Andrzej Hajda <a.hajda@...sung.com>,
	Inki Dae <daeinki@...il.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: Re: [PATCH 1/1] ARM: exynos_defconfig: Disable IOMMU support

Hello Inki,

On 03/06/2015 02:32 PM, Inki Dae wrote:
>> 
>> Another interesting data point is that the error in next-20150303 for
>> these 2 boards was the NULL pointer dereference in exynos_plane_destroy
>> that I got with 4.0-rc2 (when IOMMU is disabled) in Snow and Peach Pit.
> 
> I think the NULL pointer dereference issue may be fixed with below patch
> I merged to exynos-drm-fixes just a while ago,
> https://lkml.org/lkml/2015/2/17/434
> 
> Could you test it with this patch again?
>

Thanks, I tested v4.0-rc2 + the patch to disable IOMMU + the patch you
mentioned and the crash does not happen anymore in Peach Pit and Snow.

>> 
>> Another thing that may be useful to detect these issues early is to have
>> exynos-drm-next be pulled by linux-next since otherwise the integration
>> is not tested until the changes are picked by the DRM maintainer.
>> 

I know that I may sound like a broken record but could you please make
sure that your tree is included in linux-next?

That way the fix could be tested by all the machines that are testing
linux-next daily since right now Exynos will still be broken until you
send a pull request to the DRM maintainer.

So it would be nice to get the changes as soon as possible into -next
to avoid a recurrent error to mask other possible new issues.

Best regards,
Javier
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