Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus

* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  virtio: order used ring after used index read
  virtio-pci: fix per-vq MSI-X request logic

drivers/virtio/virtio_pci.c

@@ -530,13 +530,17 @@ static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 			err = PTR_ERR(vqs[i]);
 			goto error_find;
 		}
+
+		if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR)
+			continue;
+
 		/* allocate per-vq irq if available and necessary */
-		if (vp_dev->per_vq_vectors) {
 		snprintf(vp_dev->msix_names[msix_vec],
 			 sizeof *vp_dev->msix_names,
 			 "%s-%s",
 			 dev_name(&vp_dev->vdev.dev), names[i]);
-			err = request_irq(msix_vec, vring_interrupt, 0,
+		err = request_irq(vp_dev->msix_entries[msix_vec].vector,
+				  vring_interrupt, 0,
 				  vp_dev->msix_names[msix_vec],
 				  vqs[i]);
 		if (err) {
@@ -544,7 +548,6 @@ static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 			goto error_find;
 		}
 	}
-	}
 	return 0;
 
 error_find:

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;