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intel-iommu: Unlink domain from iommu

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When we remove a device, we unlink the iommu from the domain, but
we never do the reverse unlinking of the domain from the iommu.
This means that we never clear iommu->domain_ids, eventually leading
to resource exhaustion if we repeatedly bind and unbind a device
to a driver.  Also free empty domains to avoid a resource leak.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Donald Dutile <ddutile@redhat.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: stable@kernel.org
This commit is contained in:
Alex Williamson 2011-03-04 14:52:16 -07:00 • committed by David Woodhouse
commit a97590e56d
1 changed files with 12 additions and 1 deletions
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13
drivers/pci/intel-iommu.c
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@ -3260,9 +3260,15 @@ static int device_notifier(struct notifier_block *nb,
if (!domain)
return 0;
if (action == BUS_NOTIFY_UNBOUND_DRIVER && !iommu_pass_through)
if (action == BUS_NOTIFY_UNBOUND_DRIVER && !iommu_pass_through) {
domain_remove_one_dev_info(domain, pdev);
if (!(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE) &&
!(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY) &&
list_empty(&domain->devices))
domain_exit(domain);
}
return 0;
}
@ -3411,6 +3417,11 @@ static void domain_remove_one_dev_info(struct dmar_domain *domain,
domain->iommu_count--;
domain_update_iommu_cap(domain);
spin_unlock_irqrestore(&domain->iommu_lock, tmp_flags);
spin_lock_irqsave(&iommu->lock, tmp_flags);
clear_bit(domain->id, iommu->domain_ids);
iommu->domains[domain->id] = NULL;
spin_unlock_irqrestore(&iommu->lock, tmp_flags);
}
spin_unlock_irqrestore(&device_domain_lock, flags);