}
/* Check if subbuf was fully written. This is from Mathieu's algorithm/paper. */
+ /* FIXME: not sure data_size = 0xffffffff when the buffer is not full. It might
+ * take the value of the header size initially */
if (((commit_seq - buf->subbuf_size) & commit_seq_mask)
- (USTD_BUFFER_TRUNC(consumed_offset, buf) >> n_subbufs_order) == 0
&& header->data_size != 0xffffffff && header->sb_size != 0xffffffff) {