ar71xx: keep the RouterBOARD Power LED in On state
[oweals/openwrt.git] / 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 @@ -1036,6 +1036,62 @@ 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 @@ -68,11 +68,14 @@ 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 @@ -80,6 +83,7 @@ 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 @@ -112,4 +116,9 @@ 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