target/linux/generic/pending-4.9/402-mtd-use-typed-mtd-parsers-for-rootfs-and-firmware-split.patch

   1 From: Gabor Juhos <juhosg@openwrt.org>
   2 Subject: kernel/3.10: allow to use partition parsers for rootfs and firmware split
   3
   4 lede-commit: 3b71cd94bc9517bc25267dccb393b07d4b54564e
   5 Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
   6 ---
   7  drivers/mtd/mtdpart.c          | 37 +++++++++++++++++++++++++++++++++++++
   8  include/linux/mtd/partitions.h |  2 ++
   9  2 files changed, 39 insertions(+)
  10
  11 diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
  12 index f20207e32075..28f76315dfa0 100644
  13 --- a/drivers/mtd/mtdpart.c
  14 +++ b/drivers/mtd/mtdpart.c
  15 @@ -761,6 +761,36 @@ int mtd_del_partition(struct mtd_info *mtd, int partno)
  16  }
  17  EXPORT_SYMBOL_GPL(mtd_del_partition);
  18
  19 +static int
  20 +run_parsers_by_type(struct mtd_part *slave, enum mtd_parser_type type)
  21 +{
  22 +       struct mtd_partition *parts;
  23 +       int nr_parts;
  24 +       int i;
  25 +
  26 +       nr_parts = parse_mtd_partitions_by_type(&slave->mtd, type, (const struct mtd_partition **)&parts,
  27 +                                               NULL);
  28 +       if (nr_parts <= 0)
  29 +               return nr_parts;
  30 +
  31 +       if (WARN_ON(!parts))
  32 +               return 0;
  33 +
  34 +       for (i = 0; i < nr_parts; i++) {
  35 +               /* adjust partition offsets */
  36 +               parts[i].offset += slave->offset;
  37 +
  38 +               mtd_add_partition(slave->parent,
  39 +                                 parts[i].name,
  40 +                                 parts[i].offset,
  41 +                                 parts[i].size);
  42 +       }
  43 +
  44 +       kfree(parts);
  45 +
  46 +       return nr_parts;
  47 +}
  48 +
  49  #ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
  50  #define SPLIT_FIRMWARE_NAME    CONFIG_MTD_SPLIT_FIRMWARE_NAME
  51  #else
  52 @@ -769,6 +799,7 @@ EXPORT_SYMBOL_GPL(mtd_del_partition);
  53
  54  static void split_firmware(struct mtd_info *master, struct mtd_part *part)
  55  {
  56 +       run_parsers_by_type(part, MTD_PARSER_TYPE_FIRMWARE);
  57  }
  58
  59  void __weak arch_split_mtd_part(struct mtd_info *master, const char *name,
  60 @@ -783,6 +814,12 @@ static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part)
  61         if (rootfs_found)
  62                 return;
  63
  64 +       if (!strcmp(part->mtd.name, "rootfs")) {
  65 +               run_parsers_by_type(part, MTD_PARSER_TYPE_ROOTFS);
  66 +
  67 +               rootfs_found = 1;
  68 +       }
  69 +
  70         if (!strcmp(part->mtd.name, SPLIT_FIRMWARE_NAME) &&
  71             IS_ENABLED(CONFIG_MTD_SPLIT_FIRMWARE))
  72                 split_firmware(master, part);
  73 diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h
  74 index baafd542432e..356e29815aa2 100644
  75 --- a/include/linux/mtd/partitions.h
  76 +++ b/include/linux/mtd/partitions.h
  77 @@ -74,6 +74,8 @@ struct mtd_part_parser_data {
  78
  79  enum mtd_parser_type {
  80         MTD_PARSER_TYPE_DEVICE = 0,
  81 +       MTD_PARSER_TYPE_ROOTFS,
  82 +       MTD_PARSER_TYPE_FIRMWARE,
  83  };
  84
  85  struct mtd_part_parser {
  86 --
  87 2.11.0
  88