[PATCH for-2.6.35] virtio: return ENOMEM on out of memory

["Michael S. Tsirkin" <mst@redhat.com>]

add_buf returns ring size on out of memory,
this is not what devices expect.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

Please consider this patch for 2.6.35.

 drivers/virtio/virtio_ring.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index ed845b7..dd35b34 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -119,7 +119,7 @@ static int vring_add_indirect(struct vring_virtqueue *vq,
 
 	desc = kmalloc((out + in) * sizeof(struct vring_desc), gfp);
 	if (!desc)
-		return vq->vring.num;
+		return -ENOMEM;
 
 	/* Transfer entries from the sg list into the indirect page */
 	for (i = 0; i < out; i++) {
-- 
1.7.1.12.g42b7f