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Merge branch 'hostprogs-wmissing-prototypes' of git://git.kernel.org/pub/scm/linux...
[linux-2.6-block.git]
/
drivers
/
virtio
/
virtio_ring.c
diff --git
a/drivers/virtio/virtio_ring.c
b/drivers/virtio/virtio_ring.c
index f536005807269728f3285f7bbf6f176cd790e5c2..fbd2ecde93e409ea9287d068d3f2322297c910cc 100644
(file)
--- a/
drivers/virtio/virtio_ring.c
+++ b/
drivers/virtio/virtio_ring.c
@@
-285,6
+285,9
@@
static void *vring_get_buf(struct virtqueue *_vq, unsigned int *len)
return NULL;
}
+ /* Only get used array entries after they have been exposed by host. */
+ rmb();
+
i = vq->vring.used->ring[vq->last_used_idx%vq->vring.num].id;
*len = vq->vring.used->ring[vq->last_used_idx%vq->vring.num].len;