intel-iommu: Unlink domain from iommu

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

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 35463ddf10a1..292f2233295e 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -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);