--- linux-3.6.0-0.3.fc.el6.x86_64/drivers/md/raid5.c.orig	2012-11-21 08:51:15.312175089 -0500
+++ linux-3.6.0-0.3.fc.el6.x86_64/drivers/md/raid5.c		2012-11-21 09:02:38.415174560 -0500
@@ -2394,6 +2394,8 @@ static int add_stripe_bio(struct stripe_
		bi->bi_next = *bip;
	*bip = bi;
	raid5_inc_bi_active_stripes(bi);
+	if ((bi->bi_rw & REQ_SYNC) && !forwrite)
+		clear_bit(R5_UPTODATE, &sh->dev[dd_idx].flags);	/* force to read from disk. */

	if (forwrite) {
		/* check if page is covered */
@@ -4217,6 +4222,9 @@ static void make_request(struct mddev *m

		bio_endio(bi, 0);
	}
+
+	if (bi->bi_rw & REQ_SYNC)
+		md_wakeup_thread(mddev->thread);
 }

 static sector_t raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks);