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>

diff --git a/drivers/sbus/char/jsflash.c b/drivers/sbus/char/jsflash.c
index d56ddaa770361974208e78f4a8d70834ac8c3b26..f572a4a1d1419ed650176dde8df5768885c0f0a7 100644 (file)
--- 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);
+               }
        }
 }