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

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Date:	Tue, 10 Mar 2015 11:50:02 +0900
From:	Inki Dae <inki.dae@...sung.com>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
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

On 2015년 03월 07일 00:07, Javier Martinez Canillas wrote:
> 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?

Got it. I got several requests before. I have created a new branch -
exynos-drm/for-next - based on top of drm-next, which would have same
patch set as existing exynos-drm-next.

I will request Stephen Rothwell to merge remote-tracking branch,
'exynos-drm/for-next'.

Thanks,
Inki Dae

> 
> 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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