virtio: remove overzealous BUG_ON.

[linux-2.6-omap-h63xx.git] / include / linux / virtio.h

diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 12c18ac1b973caf7fc33f44db0ee7fa759fc361f..e7d10845b3c17be5c8bf26fa088a5c82c92e3af4 100644 (file)
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -41,6 +41,8 @@ struct virtqueue
  *     Returns NULL or the "data" token handed to add_buf.
  * @disable_cb: disable callbacks
  *     vq: the struct virtqueue we're talking about.
+ *     Note that this is not necessarily synchronous, hence unreliable and only
+ *     useful as an optimization.
  * @enable_cb: restart callbacks after disable_cb.
  *     vq: the struct virtqueue we're talking about.
  *     This re-enables callbacks; it returns "false" if there are pending
@@ -48,7 +50,8 @@ struct virtqueue
  *     checking for more work, and enabling callbacks.
  *
  * Locking rules are straightforward: the driver is responsible for
- * locking.  No two operations may be invoked simultaneously.
+ * locking.  No two operations may be invoked simultaneously, with the exception
+ * of @disable_cb.
  *
  * All operations can be called in any context.
  */