target/linux/generic/patches-4.4/401-mtd-add-support-for-different-partition-parser-types.patch

   1 From 02cff0ccaa6d364f5c1eeea83f47ac80ccc967d4 Mon Sep 17 00:00:00 2001
   2 From: Gabor Juhos <juhosg@openwrt.org>
   3 Date: Tue, 3 Sep 2013 18:11:50 +0200
   4 Subject: [PATCH] mtd: add support for different partition parser types
   5
   6 Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
   7 ---
   8  drivers/mtd/mtdpart.c          |   56 ++++++++++++++++++++++++++++++++++++++++
   9  include/linux/mtd/partitions.h |   11 ++++++++
  10  2 files changed, 67 insertions(+)
  11
  12 --- a/drivers/mtd/mtdpart.c
  13 +++ b/drivers/mtd/mtdpart.c
  14 @@ -747,6 +747,30 @@ static struct mtd_part_parser *get_parti
  15
  16  #define put_partition_parser(p) do { module_put((p)->owner); } while (0)
  17
  18 +static struct mtd_part_parser *
  19 +get_partition_parser_by_type(enum mtd_parser_type type,
  20 +                            struct mtd_part_parser *start)
  21 +{
  22 +       struct mtd_part_parser *p, *ret = NULL;
  23 +
  24 +       spin_lock(&part_parser_lock);
  25 +
  26 +       p = list_prepare_entry(start, &part_parsers, list);
  27 +       if (start)
  28 +               put_partition_parser(start);
  29 +
  30 +       list_for_each_entry_continue(p, &part_parsers, list) {
  31 +               if (p->type == type && try_module_get(p->owner)) {
  32 +                       ret = p;
  33 +                       break;
  34 +               }
  35 +       }
  36 +
  37 +       spin_unlock(&part_parser_lock);
  38 +
  39 +       return ret;
  40 +}
  41 +
  42  void register_mtd_parser(struct mtd_part_parser *p)
  43  {
  44         spin_lock(&part_parser_lock);
  45 @@ -875,6 +899,38 @@ int parse_mtd_partitions(struct mtd_info
  46         return err;
  47  }
  48
  49 +int parse_mtd_partitions_by_type(struct mtd_info *master,
  50 +                                enum mtd_parser_type type,
  51 +                                struct mtd_partition **pparts,
  52 +                                struct mtd_part_parser_data *data)
  53 +{
  54 +       struct mtd_part_parser *prev = NULL;
  55 +       int ret = 0;
  56 +
  57 +       while (1) {
  58 +               struct mtd_part_parser *parser;
  59 +
  60 +               parser = get_partition_parser_by_type(type, prev);
  61 +               if (!parser)
  62 +                       break;
  63 +
  64 +               ret = (*parser->parse_fn)(master, pparts, data);
  65 +
  66 +               if (ret > 0) {
  67 +                       put_partition_parser(parser);
  68 +                       printk(KERN_NOTICE
  69 +                              "%d %s partitions found on MTD device %s\n",
  70 +                              ret, parser->name, master->name);
  71 +                       break;
  72 +               }
  73 +
  74 +               prev = parser;
  75 +       }
  76 +
  77 +       return ret;
  78 +}
  79 +EXPORT_SYMBOL_GPL(parse_mtd_partitions_by_type);
  80 +
  81  int mtd_is_partition(const struct mtd_info *mtd)
  82  {
  83         struct mtd_part *part;
  84 --- a/include/linux/mtd/partitions.h
  85 +++ b/include/linux/mtd/partitions.h
  86 @@ -68,12 +68,17 @@ struct mtd_part_parser_data {
  87   * Functions dealing with the various ways of partitioning the space
  88   */
  89
  90 +enum mtd_parser_type {
  91 +       MTD_PARSER_TYPE_DEVICE = 0,
  92 +};
  93 +
  94  struct mtd_part_parser {
  95         struct list_head list;
  96         struct module *owner;
  97         const char *name;
  98         int (*parse_fn)(struct mtd_info *, struct mtd_partition **,
  99                         struct mtd_part_parser_data *);
 100 +       enum mtd_parser_type type;
 101  };
 102
 103  extern void register_mtd_parser(struct mtd_part_parser *parser);
 104 @@ -87,4 +92,9 @@ uint64_t mtd_get_device_size(const struc
 105  extern void __weak arch_split_mtd_part(struct mtd_info *master,
 106                                        const char *name, int offset, int size);
 107
 108 +int parse_mtd_partitions_by_type(struct mtd_info *master,
 109 +                                enum mtd_parser_type type,
 110 +                                struct mtd_partition **pparts,
 111 +                                struct mtd_part_parser_data *data);
 112 +
 113  #endif