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-rw-r--r--Documentation/virtual/00-INDEX2
-rw-r--r--drivers/virtio/virtio_ring.c8
2 files changed, 4 insertions, 6 deletions
diff --git a/Documentation/virtual/00-INDEX b/Documentation/virtual/00-INDEX
index 8e601991d91c..924bd462675e 100644
--- a/Documentation/virtual/00-INDEX
+++ b/Documentation/virtual/00-INDEX
@@ -4,8 +4,6 @@ Virtualization support in the Linux kernel.
- this file.
kvm/
- Kernel Virtual Machine. See also http://linux-kvm.org
-lguest/
- - Extremely simple hypervisor for experimental/educational use.
uml/
- User Mode Linux, builds/runs Linux kernel as a userspace program.
virtio.txt
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 79e1b292c030..5aa43c3392a2 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -35,7 +35,7 @@
#define virtio_rmb(vq) \
do { if ((vq)->weak_barriers) smp_rmb(); else rmb(); } while(0)
#define virtio_wmb(vq) \
- do { if ((vq)->weak_barriers) smp_rmb(); else rmb(); } while(0)
+ do { if ((vq)->weak_barriers) smp_wmb(); else wmb(); } while(0)
#else
/* We must force memory ordering even if guest is UP since host could be
* running on another CPU, but SMP barriers are defined to barrier() in that
@@ -308,9 +308,9 @@ bool virtqueue_kick_prepare(struct virtqueue *_vq)
bool needs_kick;
START_USE(vq);
- /* Descriptors and available array need to be set before we expose the
- * new available array entries. */
- virtio_wmb(vq);
+ /* We need to expose available array entries before checking avail
+ * event. */
+ virtio_mb(vq);
old = vq->vring.avail->idx - vq->num_added;
new = vq->vring.avail->idx;