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

2 files changed, 18 insertions, 12 deletions

diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 4a1f1ebff7bf..28d9cf7cf72f 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -530,19 +530,22 @@ 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,
-                                          vp_dev->msix_names[msix_vec],
-                                          vqs[i]);
-                        if (err) {
-                                vp_del_vq(vqs[i]);
-                                goto error_find;
-                        }
+                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(vp_dev->msix_entries[msix_vec].vector,
+                                  vring_interrupt, 0,
+                                  vp_dev->msix_names[msix_vec],
+                                  vqs[i]);
+                if (err) {
+                        vp_del_vq(vqs[i]);
+                        goto error_find;
                 }
         }
         return 0;
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index f53600580726..fbd2ecde93e4 100644
--- 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;