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@xxxxxxxxxx>
---
drivers/pci/intel-iommu.c | 10 +++++++++-
1 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 4789f8e..8bc56c1 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -3260,8 +3260,11 @@ 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 (list_empty(&domain->devices))
+ domain_exit(domain);
+ }
return 0;
}
@@ -3411,6 +3414,11 @@ 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);
--
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