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authorDavid Gibson <david@gibson.dropbear.id.au>2012-04-12 15:36:34 +1000
committerMichael S. Tsirkin <mst@redhat.com>2012-04-15 11:51:05 +0300
commit1a87228f5f1d316002c7c161316f5524592be766 (patch)
tree3c852fe87074cdc40a3435e3c18233be3b3f23e3 /drivers/virtio/virtio_balloon.c
parentc0aa3e0916d7e531e69b02e426f7162dfb1c6c0f (diff)
downloadvexpress-lsk-1a87228f5f1d316002c7c161316f5524592be766.tar.gz
virtio_balloon: Fix endian bug
Although virtio config space fields are usually in guest-native endian, the spec for the virtio balloon device explicitly states that both fields in its config space are little-endian. However, the current virtio_balloon driver does not have a suitable endian swap for the 'num_pages' field, although it does have one for the 'actual' field. This patch corrects the bug, adding sparse annotation while we're at it. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio/virtio_balloon.c')
-rw-r--r--drivers/virtio/virtio_balloon.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 05f0a80818a..9e95ca60200 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -234,11 +234,14 @@ static void virtballoon_changed(struct virtio_device *vdev)
static inline s64 towards_target(struct virtio_balloon *vb)
{
- u32 v;
+ __le32 v;
+ s64 target;
+
vb->vdev->config->get(vb->vdev,
offsetof(struct virtio_balloon_config, num_pages),
&v, sizeof(v));
- return (s64)v - vb->num_pages;
+ target = le32_to_cpu(v);
+ return target - vb->num_pages;
}
static void update_balloon_size(struct virtio_balloon *vb)