block: convert to dequeueing model (easy ones)

plat-omap/mailbox, floppy, viocd, mspro_block, i2o_block and
mmc/card/queue are already pretty close to dequeueing model and can be
converted with simple changes.  Convert them.

While at it,

* xen-blkfront: !fs check moved downwards to share dequeue call with
  normal path.

* mspro_block: __blk_end_request(..., blk_rq_cur_byte()) converted to
  __blk_end_request_cur()

* mmc/card/queue: loop of __blk_end_request() converted to
  __blk_end_request_all()

[ Impact: dequeue in-flight request ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Alex Dubov <oakad@yahoo.com>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index 93b2c6185656..58f5be8cd69e 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -672,8 +672,7 @@ try_again:
                                                msb->req_sg);
 
                 if (!msb->seg_count) {
-                        chunk = __blk_end_request(msb->block_req, -ENOMEM,
-                                        blk_rq_cur_bytes(msb->block_req));
+                        chunk = __blk_end_request_cur(msb->block_req, -ENOMEM);
                         continue;
                 }
 
@@ -711,6 +710,7 @@ try_again:
                 dev_dbg(&card->dev, "issue end\n");
                 return -EAGAIN;
         }
+        blkdev_dequeue_request(msb->block_req);
 
         dev_dbg(&card->dev, "trying again\n");
         chunk = 1;
@@ -825,8 +825,10 @@ static void mspro_block_submit_req(struct request_queue *q)
                 return;
 
         if (msb->eject) {
-                while ((req = elv_next_request(q)) != NULL)
+                while ((req = elv_next_request(q)) != NULL) {
+                        blkdev_dequeue_request(req);
                         __blk_end_request_all(req, -ENODEV);
+                }
 
                 return;
         }