Break out of wait_event_interruptible() if freezing has been requested,
in the vballoon thread. Without this change vballoon refuses to stop and
the system can't suspend.

Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com>

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 5926826..9c76a06 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -190,7 +190,8 @@ static int balloon(void *_vballoon)
                try_to_freeze();
                wait_event_interruptible(vb->config_change,
                                         (diff = towards_target(vb)) != 0
-                                        || kthread_should_stop());
+                                        || kthread_should_stop()
+                                        || freezing(current));
                if (diff > 0)
                        fill_balloon(vb, diff);
                else if (diff < 0)
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