Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux

[firefly-linux-kernel-4.4.55.git] / drivers / vhost / net.c

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index afa06d28725dad3960aed1df9dd4f9e9ddc53493..2bbfc25e582cb8b334a1ef4083b22da56c48cc65 100644 (file)
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -591,11 +591,6 @@ static void handle_rx(struct vhost_net *net)
                         * TODO: support TSO.
                         */
                        iov_iter_advance(&msg.msg_iter, vhost_hlen);
-               } else {
-                       /* It'll come from socket; we'll need to patch
-                        * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF
-                        */
-                       iov_iter_advance(&fixup, sizeof(hdr));
                }
                err = sock->ops->recvmsg(NULL, sock, &msg,
                                         sock_len, MSG_DONTWAIT | MSG_TRUNC);
@@ -609,17 +604,25 @@ static void handle_rx(struct vhost_net *net)
                        continue;
                }
                /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */
-               if (unlikely(vhost_hlen) &&
-                   copy_to_iter(&hdr, sizeof(hdr), &fixup) != sizeof(hdr)) {
-                       vq_err(vq, "Unable to write vnet_hdr at addr %p\n",
-                              vq->iov->iov_base);
-                       break;
+               if (unlikely(vhost_hlen)) {
+                       if (copy_to_iter(&hdr, sizeof(hdr),
+                                        &fixup) != sizeof(hdr)) {
+                               vq_err(vq, "Unable to write vnet_hdr "
+                                      "at addr %p\n", vq->iov->iov_base);
+                               break;
+                       }
+               } else {
+                       /* Header came from socket; we'll need to patch
+                        * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF
+                        */
+                       iov_iter_advance(&fixup, sizeof(hdr));
                }
                /* TODO: Should check and handle checksum. */
 
                num_buffers = cpu_to_vhost16(vq, headcount);
                if (likely(mergeable) &&
-                   copy_to_iter(&num_buffers, 2, &fixup) != 2) {
+                   copy_to_iter(&num_buffers, sizeof num_buffers,
+                                &fixup) != sizeof num_buffers) {
                        vq_err(vq, "Failed num_buffers write");
                        vhost_discard_vq_desc(vq, headcount);
                        break;