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authorDavid S. Miller <davem@davemloft.net>2010-05-14 03:42:49 -0700
committerDavid S. Miller <davem@davemloft.net>2010-05-14 03:42:49 -0700
commitd77f873fdd21912803836da78f627d2efd267082 (patch)
tree1a3468c7a10b948ac12bac260004eebdfd3e4a60
parentcea0d767c29669bf89f86e4aee46ef462d2ebae8 (diff)
parent0d4993563bde70bc7c7718686bc5c5c089733001 (diff)
Merge branch 'net-2.6' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
-rw-r--r--drivers/vhost/vhost.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index e69d238c5af0..49fa953aaf6e 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1035,7 +1035,12 @@ int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len)
/* This actually signals the guest, using eventfd. */
void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq)
{
- __u16 flags = 0;
+ __u16 flags;
+ /* Flush out used index updates. This is paired
+ * with the barrier that the Guest executes when enabling
+ * interrupts. */
+ smp_mb();
+
if (get_user(flags, &vq->avail->flags)) {
vq_err(vq, "Failed to get flags");
return;