linux-kernel - Re: [PATCH] of/irq: Fix msi-map calculation for nonzero rid-base

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Date:	Thu, 11 Feb 2016 10:10:49 -0800
From:	Frank Rowand <frowand.list@...il.com>
To:	Marc Zyngier <marc.zyngier@....com>, robh+dt@...nel.org
CC:	Robin Murphy <robin.murphy@....com>, grant.likely@...aro.org,
	devicetree@...r.kernel.org, mark.rutland@....com,
	david.daney@...ium.com, stuart.yoder@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] of/irq: Fix msi-map calculation for nonzero rid-base

On 2/11/2016 3:04 AM, Marc Zyngier wrote:
> On 09/02/16 11:04, Robin Murphy wrote:
>> The existing msi-map code is fine for shifting the entire RID space
>> upwards, but attempting finer-grained remapping reveals a bug. It turns
>> out that we are mistakenly treating the msi-base part as an offset, not
>> as a new base to remap onto, so things get squiffy when rid-base is
>> nonzero. Fix this, and at the same time add a sanity check against
>> having msi-map-mask clash with a nonzero rid-base, as that's another
>> thing one can easily get wrong.
>>
>> CC: <stable@...r.kernel.org>
>> Signed-off-by: Robin Murphy <robin.murphy@....com>
> 
> Rob, Frank,
> 
> Are you willing to take this one through the OF tree? Or should we route
> it through the IRQ tree? It'd be good if it make it into 4.5.
> 
> Thanks,
> 
> 	M.
> 

Just to be picky, I would like the patch to be split in two for easier
bisecting, but if Rob is happy with a single patch I'm ok with that.

Rob, will you pick this up?

Acked-by: Frank Rowand <frank.rowand@...ymobile.com>

-Frank