virtio_balloon: update_balloon_size(): update correct field

According to the virtio spec, the device configuration field
that should be updated after an inflation or deflation
operation is the 'actual' field, not the 'num_pages' one.

Commit 855e0c5288177bcb193f6f6316952d2490478e1c swapped them
in update_balloon_size(). Fix it.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Fixes: 855e0c5288177bcb193f6f6316952d2490478e1c

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index c444654fc33fb6f7e858824eb8ed816186bf3bda..5c4a95b516cf9e576884c8f84e566f03b396facb 100644 (file)
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -285,7 +285,7 @@ static void update_balloon_size(struct virtio_balloon *vb)
 {
        __le32 actual = cpu_to_le32(vb->num_pages);
 
-       virtio_cwrite(vb->vdev, struct virtio_balloon_config, num_pages,
+       virtio_cwrite(vb->vdev, struct virtio_balloon_config, actual,
                      &actual);
 }