commit a57f009108076d3c30f87be5d580c6344ad44971
author Xie Yongji <xieyongji@baidu.com> Wed Mar 20 19:26:44 2019 +0800
committer Michael S. Tsirkin <mst@redhat.com> Mon May 20 18:40:02 2019 -0400
tree 3e6973f32e9c9da60656b9ab51455bd596533cf0
parent f3facbe67110089f075aba1091dbc8280304fbaf

vhost-user-blk: Add return value for vhost_user_blk_start()

Add a return value for vhost_user_blk_start() to check whether
we start vhost-user backend successfully or not.

Signed-off-by: Xie Yongji <xieyongji@baidu.com>
Signed-off-by: Zhang Yu <zhangyu31@baidu.com>
Message-Id: <20190320112646.3712-6-xieyongji@baidu.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/block/vhost-user-blk.c

diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
index 39e1adc..6802c19 100644
--- a/hw/block/vhost-user-blk.c
+++ b/hw/block/vhost-user-blk.c
@@ -103,7 +103,7 @@
     .vhost_dev_config_notifier = vhost_user_blk_handle_config_change,
 };
 
-static void vhost_user_blk_start(VirtIODevice *vdev)
+static int vhost_user_blk_start(VirtIODevice *vdev)
 {
     VHostUserBlk *s = VHOST_USER_BLK(vdev);
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
@@ -112,13 +112,13 @@
 
     if (!k->set_guest_notifiers) {
         error_report("binding does not support guest notifiers");
-        return;
+        return -ENOSYS;
     }
 
     ret = vhost_dev_enable_notifiers(&s->dev, vdev);
     if (ret < 0) {
         error_report("Error enabling host notifiers: %d", -ret);
-        return;
+        return ret;
     }
 
     ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, true);
@@ -157,12 +157,13 @@
         vhost_virtqueue_mask(&s->dev, vdev, i, false);
     }
 
-    return;
+    return ret;
 
 err_guest_notifiers:
     k->set_guest_notifiers(qbus->parent, s->dev.nvqs, false);
 err_host_notifiers:
     vhost_dev_disable_notifiers(&s->dev, vdev);
+    return ret;
 }
 
 static void vhost_user_blk_stop(VirtIODevice *vdev)