openwrtv3/target/linux/generic/patches-2.6.36/066-block2mtd_probe.patch

--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -265,11 +265,13 @@ static int _open_bdev(struct block2mtd_d
 	bdev = open_bdev_exclusive(dev->devname, FMODE_READ|FMODE_WRITE, NULL);
 #ifndef MODULE
 	if (IS_ERR(bdev)) {
+		dev_t devt;
 
 		/* We might not have rootfs mounted at this point. Try
 		   to resolve the device name by other means. */
 
-		dev_t devt = name_to_dev_t(dev->devname);
+		wait_for_device_probe();
+		devt = name_to_dev_t(dev->devname);
 		if (devt) {
 			bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
 		}