diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 4b7e68276d6c2af928130ff37709194554e8d7f6..8741b10db2bc2003cc16819bfefe566e1895d8de 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -3263,6 +3263,7 @@ 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;