linux-kernel - Regression observed since "iommu: Propagate error in add_iommu

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Date:	Mon, 29 Jun 2015 14:46:46 +0200
From:	Eric Auger <eric.auger@...aro.org>
To:	jroedel@...e.de, Will Deacon <Will.Deacon@....com>,
	Baptiste Reynal <b.reynal@...tualopensystems.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Regression observed since "iommu: Propagate error in add_iommu_group"
 with arm-smmu

Hi Joerg, Will

I observe a regression since commit
19762d7095e6392b6ec56c363a6f29b2119488c2 (iommu: Propagate error in
add_iommu_group) with arm-smmu: I am not able to bind the vfio-platform
driver to one Calxeda Midway xgmac anymore. This latter is not assigned
any group.

Looks like the cause is, in iommu_bus_init, when doing
bus_for_each_dev(bus, NULL, &cb, add_iommu_group),
add_iommu_group fails for some devices which are not upstream to smmu
and enumerated before the xgmac. As a consequence  bus_for_each_dev
returns without looking at the xgmac.

arm_smmu_add_platform_device currently returns -ENODEV when no smmu/no
master port for the device. Shouldn't we return 0 now?

Thank you in advance

Best Regards

Eric

19762d7095e6392b6ec56c363a6f29b2119488c2 is the first bad commit
commit 19762d7095e6392b6ec56c363a6f29b2119488c2
Author: Joerg Roedel <jroedel@...e.de>
Date:   Thu May 28 18:41:26 2015 +0200

    iommu: Propagate error in add_iommu_group

    Make sure any errors reported from the IOMMU drivers get
    progapated back to the IOMMU core.

    Signed-off-by: Joerg Roedel <jroedel@...e.de>
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