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

   1 From f41f8b42db092e505382f7120994de21590dff48 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
   3 Date: Thu, 16 Oct 2014 20:52:16 +0200
   4 Subject: [PATCH] UBI: Detect EOF mark and erase all remaining blocks
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
  10 ---
  11  drivers/mtd/ubi/io.c | 5 +++++
  12  1 file changed, 5 insertions(+)
  13
  14 diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
  15 index d361349..f9bba3c 100644
  16 --- a/drivers/mtd/ubi/io.c
  17 +++ b/drivers/mtd/ubi/io.c
  18 @@ -727,6 +727,7 @@ bad:
  19   * o %UBI_IO_FF if only 0xFF bytes were read (the PEB is supposedly empty)
  20   * o a negative error code in case of failure.
  21   */
  22 +static bool erase_all_next = false;
  23  int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
  24                        struct ubi_ec_hdr *ec_hdr, int verbose)
  25  {
  26 @@ -753,6 +754,10 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
  27         }
  28
  29         magic = be32_to_cpu(ec_hdr->magic);
  30 +       if (magic == 0xdeadc0de)
  31 +               erase_all_next = true;
  32 +       if (erase_all_next)
  33 +               return read_err ? UBI_IO_FF_BITFLIPS : UBI_IO_FF;
  34         if (magic != UBI_EC_HDR_MAGIC) {
  35                 if (mtd_is_eccerr(read_err))
  36                         return UBI_IO_BAD_HDR_EBADMSG;
  37 --
  38 1.8.4.5
  39