[patch 093/100] virtio: fix suspend when using virtio_balloon

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

upstream commit: 84a139a985300901dfad99bd93c7345d180af860

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@xxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxx
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 drivers/virtio/virtio_balloon.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- 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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