vhost-user: fix the reconnect error

If the error occurs in vhost_dev_init, the value of s->connected is set to true
in advance, and there is no chance to enter this function execution again
in the future.

Signed-off-by: Li Feng <fengli@smartx.com>
Message-Id: <20231123055431.217792-2-fengli@smartx.com>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/block/vhost-user-blk.c

@@ -326,7 +326,6 @@ static int vhost_user_blk_connect(DeviceState *dev, Error **errp)
     if (s->connected) {
         return 0;
     }
-    s->connected = true;
 
     s->dev.num_queues = s->num_queues;
     s->dev.nvqs = s->num_queues;
@@ -343,15 +342,14 @@ static int vhost_user_blk_connect(DeviceState *dev, Error **errp)
         return ret;
     }
 
+    s->connected = true;
+
     /* restore vhost state */
     if (virtio_device_started(vdev, vdev->status)) {
         ret = vhost_user_blk_start(vdev, errp);
-        if (ret < 0) {
-            return ret;
-        }
     }
 
-    return 0;
+    return ret;
 }
 
 static void vhost_user_blk_disconnect(DeviceState *dev)

hw/scsi/vhost-user-scsi.c

@@ -147,7 +147,6 @@ static int vhost_user_scsi_connect(DeviceState *dev, Error **errp)
     if (s->connected) {
         return 0;
     }
-    s->connected = true;
 
     vsc->dev.num_queues = vs->conf.num_queues;
     vsc->dev.nvqs = VIRTIO_SCSI_VQ_NUM_FIXED + vs->conf.num_queues;
@@ -161,6 +160,8 @@ static int vhost_user_scsi_connect(DeviceState *dev, Error **errp)
         return ret;
     }
 
+    s->connected = true;
+
     /* restore vhost state */
     if (virtio_device_started(vdev, vdev->status)) {
         ret = vhost_user_scsi_start(s, errp);

hw/virtio/vhost-user-gpio.c

@@ -229,7 +229,6 @@ static int vu_gpio_connect(DeviceState *dev, Error **errp)
     if (gpio->connected) {
         return 0;
     }
-    gpio->connected = true;
 
     vhost_dev_set_config_notifier(vhost_dev, &gpio_ops);
     gpio->vhost_user.supports_config = true;
@@ -243,6 +242,8 @@ static int vu_gpio_connect(DeviceState *dev, Error **errp)
         return ret;
     }
 
+    gpio->connected = true;
+
     /* restore vhost state */
     if (virtio_device_started(vdev, vdev->status)) {
         vu_gpio_start(vdev);