| From | Paul Gortmaker <> | Subject | [34-longterm 088/196] intel-iommu: Unlink domain from iommu | Date | Mon, 12 Mar 2012 20:20:01 -0400 |
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From: Alex Williamson <alex.williamson@redhat.com>
------------------- This is a commit scheduled for the next v2.6.34 longterm release. If you see a problem with using this for longterm, please comment. -------------------
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: Paul Gortmaker <paul.gortmaker@windriver.com> --- drivers/pci/intel-iommu.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index 3507692..62e92e5 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -3261,9 +3261,15 @@ 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; } @@ -3412,6 +3418,11 @@ 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); -- 1.7.9.3
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