Linux Virtualization - Apr 2009 - virtio-balloon: check for freezer in kthread loop

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 <mtosatti at 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)

On Fri, 17 Apr 2009 09:44:04 am Marcelo Tosatti wrote:
> 
> 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 <mtosatti at redhat.com>
-stable too, yeah?

Applied,
Rusty.