block: row: Fix crash when adding a new field in bio struct

When adding new field to struct bio there is a crash in the removed
code lines. This issue was introduced by commit
80a8f0f87bee18283e9ca0a8966ec97ad9f084e5 "block: row-iosched idling
triggered by readahead pages"

(Partly) reverting this patch till root cause is fixed (on FS level).

Change-Id: Ie82bc806ea52a6370b57aa15455c85b2db10d0da
Signed-off-by: Tanya Brokhman <tlinder@codeaurora.org>

block/row-iosched.c

@@ -1,7 +1,7 @@
 /*
  * ROW (Read Over Write) I/O scheduler.
  *
- * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -331,10 +331,6 @@ static void row_add_request(struct request_queue *q,
 	struct row_queue *rqueue = RQ_ROWQ(rq);
 	s64 diff_ms;
 	bool queue_was_empty = list_empty(&rqueue->fifo);
-	unsigned long bv_page_flags = 0;
-
-	if (rq->bio && rq->bio->bi_io_vec && rq->bio->bi_io_vec->bv_page)
-		bv_page_flags = rq->bio->bi_io_vec->bv_page->flags;
 
 	list_add_tail(&rq->queuelist, &rqueue->fifo);
 	rd->nr_reqs[rq_data_dir(rq)]++;
@@ -367,9 +363,7 @@ static void row_add_request(struct request_queue *q,
 			rqueue->idle_data.begin_idling = false;
 			return;
 		}
-
-		if ((bv_page_flags & (1L << PG_readahead)) ||
-		    (diff_ms < rd->rd_idle_data.freq_ms)) {
+		if (diff_ms < rd->rd_idle_data.freq_ms) {
 			rqueue->idle_data.begin_idling = true;
 			row_log_rowq(rd, rqueue->prio, "Enable idling");
 		} else {