Commit bf36f9cfa6d3d caused a regression by effectively reverting Nic's
fix from 5837c80e870b that ensures we traverse the full bio_vec list
upon completion.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Cc: Nicholas Bellinger <nab@linux-iscsi.org> Cc: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Jens Axboe <axboe@fb.com>