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SubjectRegression 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@suse.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@suse.de>


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