linux-kernel - [PATCH] vfio/type1: Use the new helper to find vfio

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Message-ID: <20201022122417.245-1-yuzenghui@huawei.com>
Date:   Thu, 22 Oct 2020 20:24:17 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     <alex.williamson@...hat.com>, <cohuck@...hat.com>
CC:     <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <wanghaibin.wang@...wei.com>, Zenghui Yu <yuzenghui@...wei.com>
Subject: [PATCH] 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@...wei.com>
---
 drivers/vfio/vfio_iommu_type1.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index a05d856ae806..aa586bd684da 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1997,6 +1997,7 @@ 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)
 {
@@ -2013,18 +2014,10 @@ 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);
-- 
2.19.1