blk_end_request: changing cpqarray (take 4)

This patch converts cpqarray to use blk_end_request interfaces.
Related 'ok' arguments are converted to 'error'.

cpqarray is a little bit different from "normal" drivers.
cpqarray directly calls bio_endio() and disk_stat_add()
when completing request.  But those can be replaced with
__end_that_request_first().
After the replacement, request completion procedures of
those drivers become like the following:
    o end_that_request_first()
    o add_disk_randomness()
    o end_that_request_last()
This can be converted to __blk_end_request() by following
the rule (b) mentioned in the patch subject
"[PATCH 01/30] blk_end_request: add new request completion interface".

Cc: Mike Miller <mike.miller@hp.com>
Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 7 insertions, 29 deletions

diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index c8132d958795..69199185ff4b 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -167,7 +167,6 @@ static void start_io(ctlr_info_t *h);
 
 static inline void addQ(cmdlist_t **Qptr, cmdlist_t *c);
 static inline cmdlist_t *removeQ(cmdlist_t **Qptr, cmdlist_t *c);
-static inline void complete_buffers(struct bio *bio, int ok);
 static inline void complete_command(cmdlist_t *cmd, int timeout);
 
 static irqreturn_t do_ida_intr(int irq, void *dev_id);
@@ -980,26 +979,13 @@ static void start_io(ctlr_info_t *h)
         }
 }
 
-static inline void complete_buffers(struct bio *bio, int ok)
-{
-        struct bio *xbh;
-
-        while (bio) {
-                xbh = bio->bi_next;
-                bio->bi_next = NULL;
-                
-                bio_endio(bio, ok ? 0 : -EIO);
-
-                bio = xbh;
-        }
-}
 /*
  * Mark all buffers that cmd was responsible for
  */
 static inline void complete_command(cmdlist_t *cmd, int timeout)
 {
         struct request *rq = cmd->rq;
-        int ok=1;
+        int error = 0;
         int i, ddir;
 
         if (cmd->req.hdr.rcode & RCODE_NONFATAL &&
@@ -1011,16 +997,17 @@ static inline void complete_command(cmdlist_t *cmd, int timeout)
         if (cmd->req.hdr.rcode & RCODE_FATAL) {
                 printk(KERN_WARNING "Fatal error on ida/c%dd%d\n",
                                 cmd->ctlr, cmd->hdr.unit);
-                ok = 0;
+                error = -EIO;
         }
         if (cmd->req.hdr.rcode & RCODE_INVREQ) {
                                 printk(KERN_WARNING "Invalid request on ida/c%dd%d = (cmd=%x sect=%d cnt=%d sg=%d ret=%x)\n",
                                 cmd->ctlr, cmd->hdr.unit, cmd->req.hdr.cmd,
                                 cmd->req.hdr.blk, cmd->req.hdr.blk_cnt,
                                 cmd->req.hdr.sg_cnt, cmd->req.hdr.rcode);
-                ok = 0; 
+                error = -EIO;
         }
-        if (timeout) ok = 0;
+        if (timeout)
+                error = -EIO;
         /* unmap the DMA mapping for all the scatter gather elements */
         if (cmd->req.hdr.cmd == IDA_READ)
                 ddir = PCI_DMA_FROMDEVICE;
@@ -1030,18 +1017,9 @@ static inline void complete_command(cmdlist_t *cmd, int timeout)
                 pci_unmap_page(hba[cmd->ctlr]->pci_dev, cmd->req.sg[i].addr,
                                 cmd->req.sg[i].size, ddir);
 
-        complete_buffers(rq->bio, ok);
-
-        if (blk_fs_request(rq)) {
-                const int rw = rq_data_dir(rq);
-
-                disk_stat_add(rq->rq_disk, sectors[rw], rq->nr_sectors);
-        }
-
-        add_disk_randomness(rq->rq_disk);
-
         DBGPX(printk("Done with %p\n", rq););
-        end_that_request_last(rq, ok ? 1 : -EIO);
+        if (__blk_end_request(rq, error, blk_rq_bytes(rq)))
+                BUG();
 }
 
 /*