iwlwifi: Update iwlwifi version stamp to 1.1.19

[karo-tx-linux.git] / block / elevator.c

diff --git a/block/elevator.c b/block/elevator.c
index f9736fbdab0308f7121694df2faa3ffa68258994..8cd5775acd7a2d4c1111acb0f823a57a46819dc0 100644 (file)
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -741,7 +741,21 @@ struct request *elv_next_request(struct request_queue *q)
                        q->boundary_rq = NULL;
                }
 
-               if ((rq->cmd_flags & REQ_DONTPREP) || !q->prep_rq_fn)
+               if (rq->cmd_flags & REQ_DONTPREP)
+                       break;
+
+               if (q->dma_drain_size && rq->data_len) {
+                       /*
+                        * make sure space for the drain appears we
+                        * know we can do this because max_hw_segments
+                        * has been adjusted to be one fewer than the
+                        * device can handle
+                        */
+                       rq->nr_phys_segments++;
+                       rq->nr_hw_segments++;
+               }
+
+               if (!q->prep_rq_fn)
                        break;
 
                ret = q->prep_rq_fn(q, rq);
@@ -754,6 +768,16 @@ struct request *elv_next_request(struct request_queue *q)
                         * avoid resource deadlock.  REQ_STARTED will
                         * prevent other fs requests from passing this one.
                         */
+                       if (q->dma_drain_size && rq->data_len &&
+                           !(rq->cmd_flags & REQ_DONTPREP)) {
+                               /*
+                                * remove the space for the drain we added
+                                * so that we don't add it again
+                                */
+                               --rq->nr_phys_segments;
+                               --rq->nr_hw_segments;
+                       }
+
                        rq = NULL;
                        break;
                } else if (ret == BLKPREP_KILL) {