queue-2.6.33/intel-iommu-unlink-domain-from-iommu.patch

From a97590e56d0d58e1dd262353f7cbd84e81d8e600 Mon Sep 17 00:00:00 2001
From: Alex Williamson <alex.williamson@redhat.com>
Date: Fri, 4 Mar 2011 14:52:16 -0700
Subject: intel-iommu: Unlink domain from iommu

From: Alex Williamson <alex.williamson@redhat.com>

commit a97590e56d0d58e1dd262353f7cbd84e81d8e600 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/pci/intel-iommu.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -3238,9 +3238,15 @@ static int device_notifier(struct notifi
 	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;
 }
 
@@ -3389,6 +3395,11 @@ static void domain_remove_one_dev_info(s
 		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);