linux-kernel - Re: [PATCH 00/16 v2] iommu: Move domain allocation into drivers

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Message-ID: <20150331131441.GD4441@8bytes.org>
Date:	Tue, 31 Mar 2015 15:14:41 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	iommu@...ts.linux-foundation.org,
	Will Deacon <will.deacon@....com>,
	Kukjin Kim <kgene@...nel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Hiroshi Doyu <hdoyu@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, linux-tegra@...r.kernel.org,
	jroedel@...e.de
Subject: Re: [PATCH 00/16 v2] iommu: Move domain allocation into drivers

Hi Alex,

On Fri, Mar 27, 2015 at 10:24:22PM -0600, Alex Williamson wrote:
> For 1-5,16
> 
> Reviewed-by: Alex Williamson <alex.williamson@...hat.com>

Thanks a lot for your review.

> My only comment/question is whether you'd want to consider using
> ERR_PTR() return values from domain_alloc().  It's an alloc functions,
> so NULL == -ENOMEM is pretty standard, but we could at least have the
> interface to the iommu driver return more info even if we continue to
> mask that as NULL out to the IOMMU API users for now.  Thanks,

Yes, that might make sense. But to do anything useful with the ERR_PTR
we also need to change the iommu_domain_alloc() interface. This is
out-of-scope for this patch-set, we can discuss this seperatly.


	Joerg

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