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x86/amd-iommu: Fix deassignment of a device from the pt_domain

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Deassigning a device from the passthrough domain does not
work and breaks device assignment to kvm guests. This patch
fixes the issue.

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2010-01-22 17:55:27 +01:00
parent f532509437
commit d3ad9373b7
1 changed files with 4 additions and 2 deletions
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6
arch/x86/kernel/amd_iommu.c
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@ -1511,9 +1511,11 @@ static void __detach_device(struct device *dev)
/*
* If we run in passthrough mode the device must be assigned to the
* passthrough domain if it is detached from any other domain
* passthrough domain if it is detached from any other domain.
* Make sure we can deassign from the pt_domain itself.
*/
if (iommu_pass_through && dev_data->domain == NULL)
if (iommu_pass_through &&
(dev_data->domain == NULL && domain != pt_domain))
__attach_device(dev, pt_domain);
}