target/linux/generic/patches-4.9/401-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 @@ -996,6 +996,62 @@ void mtd_part_parser_cleanup(struct mtd_
  15         }
  16  }
  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 +               mtd_part_parser_put(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 +int parse_mtd_partitions_by_type(struct mtd_info *master,
  43 +                                enum mtd_parser_type type,
  44 +                                const struct mtd_partition **pparts,
  45 +                                struct mtd_part_parser_data *data)
  46 +{
  47 +       struct mtd_part_parser *prev = NULL;
  48 +       int ret = 0;
  49 +
  50 +       while (1) {
  51 +               struct mtd_part_parser *parser;
  52 +
  53 +               parser = get_partition_parser_by_type(type, prev);
  54 +               if (!parser)
  55 +                       break;
  56 +
  57 +               ret = (*parser->parse_fn)(master, pparts, data);
  58 +
  59 +               if (ret > 0) {
  60 +                       mtd_part_parser_put(parser);
  61 +                       printk(KERN_NOTICE
  62 +                              "%d %s partitions found on MTD device %s\n",
  63 +                              ret, parser->name, master->name);
  64 +                       break;
  65 +               }
  66 +
  67 +               prev = parser;
  68 +       }
  69 +
  70 +       return ret;
  71 +}
  72 +EXPORT_SYMBOL_GPL(parse_mtd_partitions_by_type);
  73 +
  74  int mtd_is_partition(const struct mtd_info *mtd)
  75  {
  76         struct mtd_part *part;
  77 --- a/include/linux/mtd/partitions.h
  78 +++ b/include/linux/mtd/partitions.h
  79 @@ -61,11 +61,14 @@ struct mtd_part_parser_data {
  80         unsigned long origin;
  81  };
  82
  83 -
  84  /*
  85   * Functions dealing with the various ways of partitioning the space
  86   */
  87
  88 +enum mtd_parser_type {
  89 +       MTD_PARSER_TYPE_DEVICE = 0,
  90 +};
  91 +
  92  struct mtd_part_parser {
  93         struct list_head list;
  94         struct module *owner;
  95 @@ -73,6 +76,7 @@ struct mtd_part_parser {
  96         int (*parse_fn)(struct mtd_info *, const struct mtd_partition **,
  97                         struct mtd_part_parser_data *);
  98         void (*cleanup)(const struct mtd_partition *pparts, int nr_parts);
  99 +       enum mtd_parser_type type;
 100  };
 101
 102  /* Container for passing around a set of parsed partitions */
 103 @@ -105,4 +109,9 @@ uint64_t mtd_get_device_size(const struc
 104  extern void __weak arch_split_mtd_part(struct mtd_info *master,
 105                                        const char *name, int offset, int size);
 106
 107 +int parse_mtd_partitions_by_type(struct mtd_info *master,
 108 +                                enum mtd_parser_type type,
 109 +                                const struct mtd_partition **pparts,
 110 +                                struct mtd_part_parser_data *data);
 111 +
 112  #endif