Re: [PATCH 03/17] vhost net: use goto error handling in open

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On 2020/10/22 上午8:34, Mike Christie wrote:
In the next patches vhost_dev_init will be able to fail. This patch has
vhost_net_open use goto error handling like is done in the other vhost
code to make handling vhost_dev_init failures easier to handle and
extend in the future.

Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>


Acked-by: Jason Wang <jasowang@xxxxxxxxxx>


---
  drivers/vhost/net.c | 29 ++++++++++++++---------------
  1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 531a00d..831d824 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -1286,27 +1286,18 @@ static int vhost_net_open(struct inode *inode, struct file *f)
  	if (!n)
  		return -ENOMEM;
  	vqs = kmalloc_array(VHOST_NET_VQ_MAX, sizeof(*vqs), GFP_KERNEL);
-	if (!vqs) {
-		kvfree(n);
-		return -ENOMEM;
-	}
+	if (!vqs)
+		goto err_vqs;
queue = kmalloc_array(VHOST_NET_BATCH, sizeof(void *),
  			      GFP_KERNEL);
-	if (!queue) {
-		kfree(vqs);
-		kvfree(n);
-		return -ENOMEM;
-	}
+	if (!queue)
+		goto err_queue;
  	n->vqs[VHOST_NET_VQ_RX].rxq.queue = queue;
xdp = kmalloc_array(VHOST_NET_BATCH, sizeof(*xdp), GFP_KERNEL);
-	if (!xdp) {
-		kfree(vqs);
-		kvfree(n);
-		kfree(queue);
-		return -ENOMEM;
-	}
+	if (!xdp)
+		goto err_xdp;
  	n->vqs[VHOST_NET_VQ_TX].xdp = xdp;
dev = &n->dev;
@@ -1338,6 +1329,14 @@ static int vhost_net_open(struct inode *inode, struct file *f)
  	n->refcnt_bias = 0;
return 0;
+
+err_xdp:
+	kfree(queue);
+err_queue:
+	kfree(vqs);
+err_vqs:
+	kvfree(n);
+	return -ENOMEM;
  }
static struct socket *vhost_net_stop_vq(struct vhost_net *n,




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