[qemu-xen staging-4.14] virtio-balloon: unref the iothread when unrealizing

[patchbot@xxxxxxx]

commit d1cba8ca6039a31c7b75e308cb0b1f3522050aa9
Author:     David Hildenbrand <david@xxxxxxxxxx>
AuthorDate: Wed May 20 12:04:39 2020 +0200
Commit:     Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon Aug 24 18:56:21 2020 -0500

    virtio-balloon: unref the iothread when unrealizing
    
    We took a reference when realizing, so let's drop that reference when
    unrealizing.
    
    Reviewed-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
    Reviewed-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>
    Fixes: c13c4153f76d ("virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT")
    Cc: qemu-stable@xxxxxxxxxx
    Cc: Wei Wang <wei.w.wang@xxxxxxxxx>
    Cc: Alexander Duyck <alexander.duyck@xxxxxxxxx>
    Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
    Cc: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
    Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
    Message-Id: <20200520100439.19872-4-david@xxxxxxxxxx>
    Reviewed-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
    Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
    (cherry picked from commit 105aef9c9479786d27c1c45c9b0b1fa03dc46be3)
    Signed-off-by: Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
---
 hw/virtio/virtio-balloon.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
index 3e3b5ff0f8..e20f90dad4 100644
--- a/hw/virtio/virtio-balloon.c
+++ b/hw/virtio/virtio-balloon.c
@@ -820,6 +820,7 @@ static void virtio_balloon_device_unrealize(DeviceState 
*dev, Error **errp)
 
     if (s->free_page_bh) {
         qemu_bh_delete(s->free_page_bh);
+        object_unref(OBJECT(s->iothread));
         virtio_balloon_free_page_stop(s);
         precopy_remove_notifier(&s->free_page_report_notify);
     }
--
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