target/linux/generic/patches-4.4/402-mtd-use-typed-mtd-parsers-for-rootfs-and-firmware-split.patch

   1 --- a/drivers/mtd/mtdpart.c
   2 +++ b/drivers/mtd/mtdpart.c
   3 @@ -649,6 +649,36 @@ int mtd_del_partition(struct mtd_info *m
   4  }
   5  EXPORT_SYMBOL_GPL(mtd_del_partition);
   6
   7 +static int
   8 +run_parsers_by_type(struct mtd_part *slave, enum mtd_parser_type type)
   9 +{
  10 +       struct mtd_partition *parts;
  11 +       int nr_parts;
  12 +       int i;
  13 +
  14 +       nr_parts = parse_mtd_partitions_by_type(&slave->mtd, type, &parts,
  15 +                                               NULL);
  16 +       if (nr_parts <= 0)
  17 +               return nr_parts;
  18 +
  19 +       if (WARN_ON(!parts))
  20 +               return 0;
  21 +
  22 +       for (i = 0; i < nr_parts; i++) {
  23 +               /* adjust partition offsets */
  24 +               parts[i].offset += slave->offset;
  25 +
  26 +               mtd_add_partition(slave->master,
  27 +                                 parts[i].name,
  28 +                                 parts[i].offset,
  29 +                                 parts[i].size);
  30 +       }
  31 +
  32 +       kfree(parts);
  33 +
  34 +       return nr_parts;
  35 +}
  36 +
  37  #ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
  38  #define SPLIT_FIRMWARE_NAME    CONFIG_MTD_SPLIT_FIRMWARE_NAME
  39  #else
  40 @@ -657,6 +687,7 @@ EXPORT_SYMBOL_GPL(mtd_del_partition);
  41
  42  static void split_firmware(struct mtd_info *master, struct mtd_part *part)
  43  {
  44 +       run_parsers_by_type(part, MTD_PARSER_TYPE_FIRMWARE);
  45  }
  46
  47  void __weak arch_split_mtd_part(struct mtd_info *master, const char *name,
  48 @@ -671,6 +702,12 @@ static void mtd_partition_split(struct m
  49         if (rootfs_found)
  50                 return;
  51
  52 +       if (!strcmp(part->mtd.name, "rootfs")) {
  53 +               run_parsers_by_type(part, MTD_PARSER_TYPE_ROOTFS);
  54 +
  55 +               rootfs_found = 1;
  56 +       }
  57 +
  58         if (!strcmp(part->mtd.name, SPLIT_FIRMWARE_NAME) &&
  59             config_enabled(CONFIG_MTD_SPLIT_FIRMWARE))
  60                 split_firmware(master, part);
  61 --- a/include/linux/mtd/partitions.h
  62 +++ b/include/linux/mtd/partitions.h
  63 @@ -70,6 +70,8 @@ struct mtd_part_parser_data {
  64
  65  enum mtd_parser_type {
  66         MTD_PARSER_TYPE_DEVICE = 0,
  67 +       MTD_PARSER_TYPE_ROOTFS,
  68 +       MTD_PARSER_TYPE_FIRMWARE,
  69  };
  70
  71  struct mtd_part_parser {