diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 395a279e2c88..dccf62e5b497 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -3307,6 +3307,7 @@ static int raid1_reshape(struct mddev *mddev)
 	/* ok, everything is stopped */
 	oldpool = conf->r1bio_pool;
 	conf->r1bio_pool = newpool;
+	init_waitqueue_head(&conf->r1bio_pool.wait);
 
 	for (d = d2 = 0; d < conf->raid_disks; d++) {
 		struct md_rdev *rdev = conf->mirrors[d].rdev;