openwrt/target/linux/bcm53xx/patches-3.14/500-UBI-Detect-EOF-mark-and-erase-all-remaining-blocks.patch

From f41f8b42db092e505382f7120994de21590dff48 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Date: Thu, 16 Oct 2014 20:52:16 +0200
Subject: [PATCH] UBI: Detect EOF mark and erase all remaining blocks
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
---
 drivers/mtd/ubi/io.c | 5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -727,6 +727,7 @@ bad:
  * o %UBI_IO_FF if only 0xFF bytes were read (the PEB is supposedly empty)
  * o a negative error code in case of failure.
  */
+static bool erase_all_next = false;
 int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
 		       struct ubi_ec_hdr *ec_hdr, int verbose)
 {
@@ -753,6 +754,10 @@ int ubi_io_read_ec_hdr(struct ubi_device
 	}
 
 	magic = be32_to_cpu(ec_hdr->magic);
+	if (magic == 0xdeadc0de)
+		erase_all_next = true;
+	if (erase_all_next)
+		return read_err ? UBI_IO_FF_BITFLIPS : UBI_IO_FF;
 	if (magic != UBI_EC_HDR_MAGIC) {
 		if (mtd_is_eccerr(read_err))
 			return UBI_IO_BAD_HDR_EBADMSG;