Merge tag 'iommu-fix-v5.2-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull iommu fix from Joerg Roedel:
 "Revert a commit from the previous pile of fixes which causes new
  lockdep splats. It is better to revert it for now and work on a better
  and more well tested fix"

* tag 'iommu-fix-v5.2-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  Revert "iommu/vt-d: Fix lock inversion between iommu->lock and device_domain_lock"

Author: torvalds

drivers/iommu/intel-iommu.c

@@ -2504,7 +2504,6 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
 		}
 	}
 
-	spin_lock(&iommu->lock);
 	spin_lock_irqsave(&device_domain_lock, flags);
 	if (dev)
 		found = find_domain(dev);
@@ -2520,16 +2519,17 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
 
 	if (found) {
 		spin_unlock_irqrestore(&device_domain_lock, flags);
-		spin_unlock(&iommu->lock);
 		free_devinfo_mem(info);
 		/* Caller must free the original domain */
 		return found;
 	}
 
+	spin_lock(&iommu->lock);
 	ret = domain_attach_iommu(domain, iommu);
+	spin_unlock(&iommu->lock);
+
 	if (ret) {
 		spin_unlock_irqrestore(&device_domain_lock, flags);
-		spin_unlock(&iommu->lock);
 		free_devinfo_mem(info);
 		return NULL;
 	}
@@ -2539,7 +2539,6 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
 	if (dev)
 		dev->archdata.iommu = info;
 	spin_unlock_irqrestore(&device_domain_lock, flags);
-	spin_unlock(&iommu->lock);
 
 	/* PASID table is mandatory for a PCI device in scalable mode. */
 	if (dev && dev_is_pci(dev) && sm_supported(iommu)) {