openwrtv3/target/linux/generic/patches-3.12/441-block2mtd_probe.patch

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--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -233,6 +233,7 @@ static struct block2mtd_dev *add_device(
/* 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(devname);
if (devt)
bdev = blkdev_get_by_dev(devt, mode, dev);