This patch converts cciss to use blk_end_request().
cciss is a little bit different from "normal" drivers.
cciss directly calls bio_endio() and disk_stat_add()
when completing request. But those can be replaced with
After the replacement, request completion procedures of
those drivers become like the following:
This can be converted to blk_end_request() by following
the rule (a) mentioned in the patch subject
"[PATCH 01/28] blk_end_request: add new request completion interface".