[PATCH 4/7] vhost-user-blk: Add Error parameter to vhost_user_blk_start()

[Kevin Wolf <kwolf@redhat.com>]

Instead of letting the caller make up a meaningless error message, add
an Error parameter to allow reporting the real error.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 hw/block/vhost-user-blk.c | 31 +++++++++++++++----------------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
index 0cb56baefb..e9382e152a 100644
--- a/hw/block/vhost-user-blk.c
+++ b/hw/block/vhost-user-blk.c
@@ -113,7 +113,7 @@ const VhostDevConfigOps blk_ops = {
     .vhost_dev_config_notifier = vhost_user_blk_handle_config_change,
 };
 
-static int vhost_user_blk_start(VirtIODevice *vdev)
+static int vhost_user_blk_start(VirtIODevice *vdev, Error **errp)
 {
     VHostUserBlk *s = VHOST_USER_BLK(vdev);
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
@@ -121,19 +121,19 @@ static int vhost_user_blk_start(VirtIODevice *vdev)
     int i, ret;
 
     if (!k->set_guest_notifiers) {
-        error_report("binding does not support guest notifiers");
+        error_setg(errp, "binding does not support guest notifiers");
         return -ENOSYS;
     }
 
     ret = vhost_dev_enable_notifiers(&s->dev, vdev);
     if (ret < 0) {
-        error_report("Error enabling host notifiers: %d", -ret);
+        error_setg_errno(errp, -ret, "Error enabling host notifiers");
         return ret;
     }
 
     ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, true);
     if (ret < 0) {
-        error_report("Error binding guest notifier: %d", -ret);
+        error_setg_errno(errp, -ret, "Error binding guest notifier");
         goto err_host_notifiers;
     }
 
@@ -141,27 +141,27 @@ static int vhost_user_blk_start(VirtIODevice *vdev)
 
     ret = vhost_dev_prepare_inflight(&s->dev, vdev);
     if (ret < 0) {
-        error_report("Error set inflight format: %d", -ret);
+        error_setg_errno(errp, -ret, "Error setting inflight format");
         goto err_guest_notifiers;
     }
 
     if (!s->inflight->addr) {
         ret = vhost_dev_get_inflight(&s->dev, s->queue_size, s->inflight);
         if (ret < 0) {
-            error_report("Error get inflight: %d", -ret);
+            error_setg_errno(errp, -ret, "Error getting inflight");
             goto err_guest_notifiers;
         }
     }
 
     ret = vhost_dev_set_inflight(&s->dev, s->inflight);
     if (ret < 0) {
-        error_report("Error set inflight: %d", -ret);
+        error_setg_errno(errp, -ret, "Error setting inflight");
         goto err_guest_notifiers;
     }
 
     ret = vhost_dev_start(&s->dev, vdev);
     if (ret < 0) {
-        error_report("Error starting vhost: %d", -ret);
+        error_setg_errno(errp, -ret, "Error starting vhost");
         goto err_guest_notifiers;
     }
     s->started_vu = true;
@@ -214,6 +214,7 @@ static void vhost_user_blk_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VHostUserBlk *s = VHOST_USER_BLK(vdev);
     bool should_start = virtio_device_started(vdev, status);
+    Error *local_err = NULL;
     int ret;
 
     if (!vdev->vm_running) {
@@ -229,10 +230,9 @@ static void vhost_user_blk_set_status(VirtIODevice *vdev, uint8_t status)
     }
 
     if (should_start) {
-        ret = vhost_user_blk_start(vdev);
+        ret = vhost_user_blk_start(vdev, &local_err);
         if (ret < 0) {
-            error_report("vhost-user-blk: vhost start failed: %s",
-                         strerror(-ret));
+            error_reportf_err(local_err, "vhost-user-blk: vhost start failed: ");
             qemu_chr_fe_disconnect(&s->chardev);
         }
     } else {
@@ -270,6 +270,7 @@ static uint64_t vhost_user_blk_get_features(VirtIODevice *vdev,
 static void vhost_user_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
 {
     VHostUserBlk *s = VHOST_USER_BLK(vdev);
+    Error *local_err = NULL;
     int i, ret;
 
     if (!vdev->start_on_kick) {
@@ -287,10 +288,9 @@ static void vhost_user_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
     /* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start
      * vhost here instead of waiting for .set_status().
      */
-    ret = vhost_user_blk_start(vdev);
+    ret = vhost_user_blk_start(vdev, &local_err);
     if (ret < 0) {
-        error_report("vhost-user-blk: vhost start failed: %s",
-                     strerror(-ret));
+        error_reportf_err(local_err, "vhost-user-blk: vhost start failed: ");
         qemu_chr_fe_disconnect(&s->chardev);
         return;
     }
@@ -340,9 +340,8 @@ static int vhost_user_blk_connect(DeviceState *dev, Error **errp)
 
     /* restore vhost state */
     if (virtio_device_started(vdev, vdev->status)) {
-        ret = vhost_user_blk_start(vdev);
+        ret = vhost_user_blk_start(vdev, errp);
         if (ret < 0) {
-            error_setg_errno(errp, -ret, "vhost start failed");
             return ret;
         }
     }
-- 
2.30.2