From: Zenghui Yu <yuzenghui@huawei.com>
Date: Thu, 22 Oct 2020 12:24:17 +0000 (+0800)
Subject: vfio/type1: Use the new helper to find vfio_group
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=572f64c71e0fe30089699b22ce0ca3d4bf452ce9;p=linux.git

vfio/type1: Use the new helper to find vfio_group

When attaching a new group to the container, let's use the new helper
vfio_iommu_find_iommu_group() to check if it's already attached. There
is no functional change.

Also take this chance to add a missing blank line.

Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index bb2684cc245ef..67e8276389951 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1993,6 +1993,7 @@ static void vfio_iommu_iova_insert_copy(struct vfio_iommu *iommu,
 
 	list_splice_tail(iova_copy, iova);
 }
+
 static int vfio_iommu_type1_attach_group(void *iommu_data,
 					 struct iommu_group *iommu_group)
 {
@@ -2009,18 +2010,10 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
 
 	mutex_lock(&iommu->lock);
 
-	list_for_each_entry(d, &iommu->domain_list, next) {
-		if (find_iommu_group(d, iommu_group)) {
-			mutex_unlock(&iommu->lock);
-			return -EINVAL;
-		}
-	}
-
-	if (iommu->external_domain) {
-		if (find_iommu_group(iommu->external_domain, iommu_group)) {
-			mutex_unlock(&iommu->lock);
-			return -EINVAL;
-		}
+	/* Check for duplicates */
+	if (vfio_iommu_find_iommu_group(iommu, iommu_group)) {
+		mutex_unlock(&iommu->lock);
+		return -EINVAL;
 	}
 
 	group = kzalloc(sizeof(*group), GFP_KERNEL);