Signed-off-by: Sandeep K Sinha <redacted>
Date:   Fri May 22 13:46:56 2009 +0530

    Protecting mddev with barriers to avoid races.

diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 9ad6ec4..e2dbda8 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c

@@ -28,10 +28,12 @@
 static inline dev_info_t *which_dev(mddev_t *mddev, sector_t sector)
 {
        int lo, mid, hi;
-       linear_conf_t *conf = mddev_to_conf(mddev);
+       linear_conf_t *conf;

        lo = 0;
        hi = mddev->raid_disks - 1;
+       barrier();
+       conf = mddev_to_conf(mddev);