linux-kernel - Re: [PATCH 10/16] iommu/amd: Implement MSI routines for interrupt remapping

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Message-ID: <20120928150413.GI4009@amd.com>
Date:	Fri, 28 Sep 2012 17:04:13 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/16] iommu/amd: Implement MSI routines for interrupt
 remapping

On Fri, Sep 28, 2012 at 10:49:34AM -0400, Konrad Rzeszutek Wilk wrote:
> On Fri, Sep 28, 2012 at 02:24:00PM +0200, Joerg Roedel wrote:
> > +	if (index >= MAX_IRQS_PER_TABLE)
> > +		return 0;
> 
> Hmm? Not an error code?

No, when this case happens it just means that the interrupt is not
remapped (because the device itself is not handled by the IOMMU). This
is not an error code and only tells the code which composes the msi-msg
to use the default routine instead of the one for interrupt remapping.

	Joerg

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