linux-kernel - [RFC PATCH V2 6/7] virtio: use err label in __vring_new

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Message-Id: <20210423080942.2997-7-jasowang@redhat.com>
Date:   Fri, 23 Apr 2021 16:09:41 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, xieyongji@...edance.com,
        stefanha@...hat.com, file@...t.tu-berlin.de, ashish.kalra@....com,
        konrad.wilk@...cle.com, kvm@...r.kernel.org, hch@...radead.org
Subject: [RFC PATCH V2 6/7] virtio: use err label in __vring_new_virtqueue()

Using error label for unwind in __vring_new_virtqueue. This is useful
for future refacotring.

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/virtio/virtio_ring.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 11dfa0dc8ec1..9800f1c9ce4c 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -2137,10 +2137,8 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
 
 	vq->split.desc_state = kmalloc_array(vring.num,
 			sizeof(struct vring_desc_state_split), GFP_KERNEL);
-	if (!vq->split.desc_state) {
-		kfree(vq);
-		return NULL;
-	}
+	if (!vq->split.desc_state)
+		goto err_state;
 
 	/* Put everything in free lists. */
 	vq->free_head = 0;
@@ -2151,6 +2149,10 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
 
 	list_add_tail(&vq->vq.list, &vdev->vqs);
 	return &vq->vq;
+
+err_state:
+	kfree(vq);
+	return NULL;
 }
 EXPORT_SYMBOL_GPL(__vring_new_virtqueue);
 
-- 
2.25.1