* Copyright (C) 2007, 2008 Rusty Russell IBM Corporation
*/
+#include <asm/barrier.h>
#include <linux/err.h>
#include <linux/hw_random.h>
#include <linux/scatterlist.h>
static void random_recv_done(struct virtqueue *vq)
{
struct virtrng_info *vi = vq->vdev->priv;
+ unsigned int len;
/* We can get spurious callbacks, e.g. shared IRQs + virtio_pci. */
- if (!virtqueue_get_buf(vi->vq, &vi->data_avail))
+ if (!virtqueue_get_buf(vi->vq, &len))
return;
- vi->data_idx = 0;
-
+ smp_store_release(&vi->data_avail, len);
complete(&vi->have_data);
}
struct scatterlist sg;
reinit_completion(&vi->have_data);
- vi->data_avail = 0;
vi->data_idx = 0;
sg_init_one(&sg, vi->data, sizeof(vi->data));
read = 0;
/* copy available data */
- if (vi->data_avail) {
+ if (smp_load_acquire(&vi->data_avail)) {
chunk = copy_data(vi, buf, size);
size -= chunk;
read += chunk;