jsflash: dequeue in-flight request

jsflash processes requests one-by-one synchronously from a kthread and
can be easily converted to dequeueing model.  Convert it.

[ Impact: dequeue in-flight request ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 17 insertions, 11 deletions

diff --git a/drivers/sbus/char/jsflash.c b/drivers/sbus/char/jsflash.c
index d56ddaa77036..f572a4a1d141 100644
--- a/drivers/sbus/char/jsflash.c
+++ b/drivers/sbus/char/jsflash.c
@@ -186,31 +186,37 @@ static void jsfd_do_request(struct request_queue *q)
 {
         struct request *req;
 
-        while ((req = elv_next_request(q)) != NULL) {
+        req = elv_next_request(q);
+        if (req)
+                blkdev_dequeue_request(req);
+
+        while (req) {
                 struct jsfd_part *jdp = req->rq_disk->private_data;
                 unsigned long offset = blk_rq_pos(req) << 9;
                 size_t len = blk_rq_cur_bytes(req);
+                int err = -EIO;
 
-                if ((offset + len) > jdp->dsize) {
-                        __blk_end_request_cur(req, -EIO);
-                        continue;
-                }
+                if ((offset + len) > jdp->dsize)
+                        goto end;
 
                 if (rq_data_dir(req) != READ) {
                         printk(KERN_ERR "jsfd: write\n");
-                        __blk_end_request_cur(req, -EIO);
-                        continue;
+                        goto end;
                 }
 
                 if ((jdp->dbase & 0xff000000) != 0x20000000) {
                         printk(KERN_ERR "jsfd: bad base %x\n", (int)jdp->dbase);
-                        __blk_end_request_cur(req, -EIO);
-                        continue;
+                        goto end;
                 }
 
                 jsfd_read(req->buffer, jdp->dbase + offset, len);
-
-                __blk_end_request_cur(req, 0);
+                err = 0;
+        end:
+                if (!__blk_end_request_cur(req, err)) {
+                        req = elv_next_request(q);
+                        if (req)
+                                blkdev_dequeue_request(req);
+                }
         }
 }