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

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Message-ID: <56BA111D.9050807@arm.com>
Date:	Tue, 9 Feb 2016 16:17:33 +0000
From:	Robin Murphy <robin.murphy@....com>
To:	Mark Rutland <mark.rutland@....com>,
	Stuart Yoder <stuart.yoder@....com>
Cc:	Marc Zyngier <marc.zyngier@....com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"frowand.list@...il.com" <frowand.list@...il.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"david.daney@...ium.com" <david.daney@...ium.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] of/irq: Fix msi-map calculation for nonzero rid-base

On 09/02/16 16:08, Mark Rutland wrote:
[...]

>>>> having msi-map-mask clash with a nonzero rid-base, as that's another
>>>> thing one can easily get wrong.

[...]

>>>> +		if (rid_base & ~map_mask) {
>>>> +			dev_err(parent_dev,
>>>> +				"Invalid msi-map translation - msi-map-mask (0x%x) ignores rid-
>>> base (0x%x)\n",
>>>> +				map_mask, rid_base);
>>>> +			return rid_out;
>>>> +		}

[...]

>>                     msi-map = <0x0100 &its 0x11 0x1>;
>>                     msi-map-mask = <0xff>;
>>
>
> I'd say that this is an inconsistent set of properties, and it's
> probably worth warning if we encounter this. There is no possible way
> that rid-base can be encountered.

Indeed ;)

Robin.

> Thanks,
> Mark.
>