Revert "vfio/pci: Fix wrong return value when get iommu attribute DOMAIN_ATTR_NESTING"

virt inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I61SPO
CVE: NA

--------------------------------

This reverts commit 22f7a4bf.
Signed-off-by: NKunkun Jiang <jiangkunkun@huawei.com>
Reviewed-by: NKeqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/vfio/pci/vfio_pci.c

@@ -557,12 +557,8 @@ static int vfio_pci_dma_fault_init(struct vfio_pci_device *vdev)
 		return 0;
 
 	ret = iommu_domain_get_attr(domain, DOMAIN_ATTR_NESTING, &nested);
-	if (ret || !nested) {
-		if (ret)
-			pr_warn("%s: Get DOMAIN_ATTR_NESTING failed: %d.\n",
-				__func__, ret);
-		return 0;
-	}
+	if (ret || !nested)
+		return ret;
 
 	mutex_init(&vdev->fault_queue_lock);
 
@@ -651,12 +647,8 @@ static int vfio_pci_dma_fault_response_init(struct vfio_pci_device *vdev)
 		return 0;
 
 	ret = iommu_domain_get_attr(domain, DOMAIN_ATTR_NESTING, &nested);
-	if (ret || !nested) {
-		if (ret)
-			pr_warn("%s: Get DOMAIN_ATTR_NESTING failed: %d.\n",
-				__func__, ret);
-		return 0;
-	}
+	if (ret || !nested)
+		return ret;
 
 	mutex_init(&vdev->fault_response_queue_lock);