Revert "vhost-user: fix lost reconnect"

This reverts commit f02a4b8e64.

Since the current patch cannot completely fix the lost reconnect
problem, there is a scenario that is not considered:
- When the virtio-blk driver is removed from the guest os,
  s->connected has no chance to be set to false, resulting in
  subsequent reconnection not being executed.

The next patch will completely fix this issue with a better approach.

Signed-off-by: Li Feng <fengli@smartx.com>
Message-Id: <20240516025753.130171-2-fengli@smartx.com>
Reviewed-by: Raphael Norwitz <raphael@enfabrica.net>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/block/vhost-user-blk.c

@@ -385,7 +385,7 @@ static void vhost_user_blk_event(void *opaque, QEMUChrEvent event)
     case CHR_EVENT_CLOSED:
         /* defer close until later to avoid circular close */
         vhost_user_async_close(dev, &s->chardev, &s->dev,
-                               vhost_user_blk_disconnect, vhost_user_blk_event);
+                               vhost_user_blk_disconnect);
         break;
     case CHR_EVENT_BREAK:
     case CHR_EVENT_MUX_IN:

hw/scsi/vhost-user-scsi.c

@@ -215,8 +215,7 @@ static void vhost_user_scsi_event(void *opaque, QEMUChrEvent event)
     case CHR_EVENT_CLOSED:
         /* defer close until later to avoid circular close */
         vhost_user_async_close(dev, &vs->conf.chardev, &vsc->dev,
-                               vhost_user_scsi_disconnect,
+                               vhost_user_scsi_disconnect);
-                               vhost_user_scsi_event);
         break;
     case CHR_EVENT_BREAK:
     case CHR_EVENT_MUX_IN:

hw/virtio/vhost-user-base.c

@@ -254,7 +254,7 @@ static void vub_event(void *opaque, QEMUChrEvent event)
     case CHR_EVENT_CLOSED:
         /* defer close until later to avoid circular close */
         vhost_user_async_close(dev, &vub->chardev, &vub->vhost_dev,
-                               vub_disconnect, vub_event);
+                               vub_disconnect);
         break;
     case CHR_EVENT_BREAK:
     case CHR_EVENT_MUX_IN:

hw/virtio/vhost-user.c

@@ -2776,7 +2776,6 @@ typedef struct {
     DeviceState *dev;
     CharBackend *cd;
     struct vhost_dev *vhost;
-    IOEventHandler *event_cb;
 } VhostAsyncCallback;
 
 static void vhost_user_async_close_bh(void *opaque)
@@ -2791,10 +2790,7 @@ static void vhost_user_async_close_bh(void *opaque)
      */
     if (vhost->vdev) {
         data->cb(data->dev);
-    } else if (data->event_cb) {
+    }
-        qemu_chr_fe_set_handlers(data->cd, NULL, NULL, data->event_cb,
-                                 NULL, data->dev, NULL, true);
-   }
 
     g_free(data);
 }
@@ -2806,8 +2802,7 @@ static void vhost_user_async_close_bh(void *opaque)
  */
 void vhost_user_async_close(DeviceState *d,
                             CharBackend *chardev, struct vhost_dev *vhost,
-                            vu_async_close_fn cb,
+                            vu_async_close_fn cb)
-                            IOEventHandler *event_cb)
 {
     if (!runstate_check(RUN_STATE_SHUTDOWN)) {
         /*
@@ -2823,7 +2818,6 @@ void vhost_user_async_close(DeviceState *d,
         data->dev = d;
         data->cd = chardev;
         data->vhost = vhost;
-        data->event_cb = event_cb;
 
         /* Disable any further notifications on the chardev */
         qemu_chr_fe_set_handlers(chardev,

include/hw/virtio/vhost-user.h

@@ -108,7 +108,6 @@ typedef void (*vu_async_close_fn)(DeviceState *cb);
 
 void vhost_user_async_close(DeviceState *d,
                             CharBackend *chardev, struct vhost_dev *vhost,
-                            vu_async_close_fn cb,
+                            vu_async_close_fn cb);
-                            IOEventHandler *event_cb);
 
 #endif