target/linux/generic/patches-4.4/431-mtd-bcm47xxpart-check-for-bad-blocks-when-calculatin.patch

   1 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
   2 Date: Sat, 2 Jan 2016 01:04:52 +0100
   3 Subject: [PATCH] mtd: bcm47xxpart: check for bad blocks when calculating
   4  offsets
   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/bcm47xxpart.c | 50 +++++++++++++++++++++++++++++++++++++----------
  12  1 file changed, 40 insertions(+), 10 deletions(-)
  13
  14 --- a/drivers/mtd/bcm47xxpart.c
  15 +++ b/drivers/mtd/bcm47xxpart.c
  16 @@ -62,6 +62,34 @@ static void bcm47xxpart_add_part(struct
  17         part->mask_flags = mask_flags;
  18  }
  19
  20 +/*
  21 + * Calculate real end offset (address) for a given amount of data. It checks
  22 + * all blocks skipping bad ones.
  23 + */
  24 +static size_t bcm47xxpart_real_offset(struct mtd_info *master, size_t offset,
  25 +                                     size_t bytes)
  26 +{
  27 +       size_t real_offset = offset;
  28 +
  29 +       if (mtd_block_isbad(master, real_offset))
  30 +               pr_warn("Base offset shouldn't be at bad block");
  31 +
  32 +       while (bytes >= master->erasesize) {
  33 +               bytes -= master->erasesize;
  34 +               real_offset += master->erasesize;
  35 +               while (mtd_block_isbad(master, real_offset)) {
  36 +                       real_offset += master->erasesize;
  37 +
  38 +                       if (real_offset >= master->size)
  39 +                               return real_offset - master->erasesize;
  40 +               }
  41 +       }
  42 +
  43 +       real_offset += bytes;
  44 +
  45 +       return real_offset;
  46 +}
  47 +
  48  static const char *bcm47xxpart_trx_data_part_name(struct mtd_info *master,
  49                                                   size_t offset)
  50  {
  51 @@ -113,19 +141,22 @@ static int bcm47xxpart_parse_trx(struct
  52         if (header.offset[2]) {
  53                 part = &parts[curr_part++];
  54                 part->name = "loader";
  55 -               part->offset = trx->offset + header.offset[i];
  56 +               part->offset = bcm47xxpart_real_offset(master, trx->offset,
  57 +                                                      header.offset[i]);
  58                 i++;
  59         }
  60
  61         if (header.offset[i]) {
  62                 part = &parts[curr_part++];
  63                 part->name = "linux";
  64 -               part->offset = trx->offset + header.offset[i];
  65 +               part->offset = bcm47xxpart_real_offset(master, trx->offset,
  66 +                                                      header.offset[i]);
  67                 i++;
  68         }
  69
  70         if (header.offset[i]) {
  71 -               size_t offset = trx->offset + header.offset[i];
  72 +               size_t offset = bcm47xxpart_real_offset(master, trx->offset,
  73 +                                                       header.offset[i]);
  74
  75                 part = &parts[curr_part++];
  76                 part->name = bcm47xxpart_trx_data_part_name(master, offset);