virtio: console: don't rely on virtqueue_add_buf() returning capacity.

Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
mariux64 · Dec 18, 2012 · 49e86f1 · 49e86f1
1 parent 9ed4cb0
commit 49e86f1
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
@@ -396,6 +396,8 @@ static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf)
 
 	ret = virtqueue_add_buf(vq, sg, 0, 1, buf, GFP_ATOMIC);
 	virtqueue_kick(vq);
+	if (!ret)
+		ret = vq->num_free;
 	return ret;
 }