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vfio: Ignore -ENODEV when getting MSI cookie 

When we try to get an MSI cookie for a VFIO device, that can fail if
CONFIG_IOMMU_DMA is not set. In this case iommu_get_msi_cookie() returns
-ENODEV, and that should not be fatal.

Ignore that case and proceed with the initialisation.

This fixes VFIO with a platform device on the Calxeda Midway (no MSIs).

Fixes: f6810c15cf ("iommu/arm-smmu: Clean up early-probing workarounds")
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Andre Przywara 2020-04-01 11:27:24 +01:00 committed by Alex Williamson
parent 00bc509554
commit f44efca049
1 changed files with 1 additions and 1 deletions
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2
drivers/vfio/vfio_iommu_type1.c
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@ -1787,7 +1787,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
if (resv_msi) {
ret = iommu_get_msi_cookie(domain->domain, resv_msi_base);
if (ret)
if (ret && ret != -ENODEV)
goto out_detach;
}