Fix soft lockup with iSeries viocd driver

Index: linux-2.6.20-rc5/drivers/cdrom/viocd.c
===================================================================
@@ -376,6 +376,25 @@ static int send_request(struct request *
        return 0;
 }
 
+static void viocd_end_request(struct request *req, int uptodate)
+{
+       int nsectors = req->hard_nr_sectors;
+
+       /*
+        * Make sure it's fully ended, and ensure that we process
+        * at least one sector.
+        */
+       if (blk_pc_request(req))
+               nsectors = (req->data_len + 511) >> 9;
+       if (!nsectors)
+               nsectors = 1;
+
+       if (end_that_request_first(req, uptodate, nsectors))
+               BUG();
+       add_disk_randomness(req->rq_disk);
+       blkdev_dequeue_request(req);
+       end_that_request_last(req, uptodate);
+}
 
 static int rwreq;
 

@@ -385,11 +404,11 @@ static void do_viocd_request(request_que
 
        while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
                if (!blk_fs_request(req))
-                       end_request(req, 0);
+                       viocd_end_request(req, 0);
                else if (send_request(req) < 0) {
                        printk(VIOCD_KERN_WARNING
                                        "unable to send message to OS/400!");
-                       end_request(req, 0);
+                       viocd_end_request(req, 0);
                } else
                        rwreq++;
        }

@@ -601,9 +620,9 @@ return_complete:
                                        "with rc %d:0x%04X: %s\n",
                                        req, event->xRc,
                                        bevent->sub_result, err->msg);
-                       end_request(req, 0);
+                       viocd_end_request(req, 0);
                } else
-                       end_request(req, 1);
+                       viocd_end_request(req, 1);
 
                /* restart handling of incoming requests */
                spin_unlock_irqrestore(&viocd_reqlock, flags);