openwrt/target/linux/generic/patches-2.6.31/066-block2mtd_probe.patch

--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -268,6 +268,7 @@ static int _open_bdev(struct block2mtd_d
 		/* We might not have rootfs mounted at this point. Try
 		   to resolve the device name by other means. */
 
+		wait_for_device_probe();
 		dev_t devt = name_to_dev_t(dev->devname);
 		if (devt) {
 			bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);