diff --git a/drivers/md/md.c b/drivers/md/md.c
index 5469ae3..aa640a8 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3324,7 +3324,7 @@
 	char *e;
 	unsigned long long n = simple_strtoull(buf, &e, 10);
 
-	if (mddev->pers)
+	if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
 		return -EBUSY;
 	if (cmd_match(buf, "none"))
 		n = MaxSector;