linux-kernel - Re: [PATCH v2] iommu/of: Remove PCI host bridge node check

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Message-ID: <20170922085618.GI8398@8bytes.org>
Date:   Fri, 22 Sep 2017 10:56:19 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        jean-philippe.brucker@....com
Subject: Re: [PATCH v2] iommu/of: Remove PCI host bridge node check

Hey Robin,

On Thu, Sep 21, 2017 at 11:20:58AM +0100, Robin Murphy wrote:
> of_pci_iommu_init() tries to be clever and stop its alias walk at the
> device represented by master_np, in case of weird PCI topologies where
> the bridge to the IOMMU and the rest of the system is not at the root.
> It turns out this is a bit short-sighted, since there are plenty of
> other callers of pci_for_each_dma_alias() which would also need the same
> behaviour in that situation, and the only platform so far with such a
> topology (Cavium ThunderX2) already solves it more generally via a PCI
> quirk. As this check is effectively redundant, and returning a boolean
> value as an int is a bit broken anyway, let's just get rid of it.
> 
> Reported-by: Jean-Philippe Brucker <jean-philippe.brucker@....com>
> Signed-off-by: Robin Murphy <robin.murphy@....com>

Can you send me a Fixes: tag for this please? No need to resend the
whole patch, I just need the tag.

Thanks,

	Joerg