diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 2c41b201cfb4a231aad7b161e3a5c19b082ebe6e..e04182abfb0834478040305a6076778005e2d151 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -754,8 +754,16 @@ static struct md_rdev *read_balance(struct r10conf *conf,
 		rdev = rcu_dereference(conf->mirrors[disk].replacement);
 		if (rdev == NULL || test_bit(Faulty, &rdev->flags) ||
 		    test_bit(WantRemove, &rdev->flags) ||
-		    r10_bio->devs[slot].addr + sectors > rdev->recovery_offset)
+		    r10_bio->devs[slot].addr + sectors >
+		    rdev->recovery_offset) {
+			/*
+			 * Read replacement first to prevent reading both rdev
+			 * and replacement as NULL during replacement replace
+			 * rdev
+			 */
+			smp_mb();
 			rdev = rcu_dereference(conf->mirrors[disk].rdev);
+		}
 		if (rdev == NULL ||
 		    test_bit(WantRemove, &rdev->flags) ||
 		    test_bit(Faulty, &rdev->flags))
@@ -1363,9 +1371,15 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
 
 	for (i = 0;  i < conf->copies; i++) {
 		int d = r10_bio->devs[i].devnum;
-		struct md_rdev *rdev = rcu_dereference(conf->mirrors[d].rdev);
-		struct md_rdev *rrdev = rcu_dereference(
-			conf->mirrors[d].replacement);
+		struct md_rdev *rrdev, *rdev;
+
+		rrdev = rcu_dereference(conf->mirrors[d].replacement);
+		/*
+		 * Read replacement first to Prevent reading both rdev and
+		 * replacement as NULL during replacement replace rdev.
+		 */
+		smp_mb();
+		rdev = rcu_dereference(conf->mirrors[d].rdev);
 		if (rdev == rrdev)
 			rrdev = NULL;
 		if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) {