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kernel/3.10: allow to use different MTD parser types

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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 38107
This commit is contained in:
Gabor Juhos 2013-09-21 17:55:18 +00:00
parent 0ee77c1efb
commit 6f2b80dff1
1 changed files with 113 additions and 0 deletions
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113
target/linux/generic/patches-3.10/401-mtd-add-support-for-different-partition-parser-types.patch Normal file
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@ -0,0 +1,113 @@
From 02cff0ccaa6d364f5c1eeea83f47ac80ccc967d4 Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Tue, 3 Sep 2013 18:11:50 +0200
Subject: [PATCH] mtd: add support for different partition parser types
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
---
drivers/mtd/mtdpart.c | 56 ++++++++++++++++++++++++++++++++++++++++
include/linux/mtd/partitions.h | 11 ++++++++
2 files changed, 67 insertions(+)
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -831,6 +831,30 @@ static struct mtd_part_parser *get_parti
#define put_partition_parser(p) do { module_put((p)->owner); } while (0)
+static struct mtd_part_parser *
+get_partition_parser_by_type(enum mtd_parser_type type,
+ struct mtd_part_parser *start)
+{
+ struct mtd_part_parser *p, *ret = NULL;
+
+ spin_lock(&part_parser_lock);
+
+ p = list_prepare_entry(start, &part_parsers, list);
+ if (start)
+ put_partition_parser(start);
+
+ list_for_each_entry_continue(p, &part_parsers, list) {
+ if (p->type == type && try_module_get(p->owner)) {
+ ret = p;
+ break;
+ }
+ }
+
+ spin_unlock(&part_parser_lock);
+
+ return ret;
+}
+
int register_mtd_parser(struct mtd_part_parser *p)
{
spin_lock(&part_parser_lock);
@@ -907,6 +931,38 @@ int parse_mtd_partitions(struct mtd_info
return ret;
}
+int parse_mtd_partitions_by_type(struct mtd_info *master,
+ enum mtd_parser_type type,
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+{
+ struct mtd_part_parser *prev = NULL;
+ int ret = 0;
+
+ while (1) {
+ struct mtd_part_parser *parser;
+
+ parser = get_partition_parser_by_type(type, prev);
+ if (!parser)
+ break;
+
+ ret = (*parser->parse_fn)(master, pparts, data);
+
+ if (ret > 0) {
+ put_partition_parser(parser);
+ printk(KERN_NOTICE
+ "%d %s partitions found on MTD device %s\n",
+ ret, parser->name, master->name);
+ break;
+ }
+
+ prev = parser;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(parse_mtd_partitions_by_type);
+
int mtd_is_partition(const struct mtd_info *mtd)
{
struct mtd_part *part;
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -68,12 +68,17 @@ struct mtd_part_parser_data {
* Functions dealing with the various ways of partitioning the space
*/
+enum mtd_parser_type {
+ MTD_PARSER_TYPE_DEVICE = 0,
+};
+
struct mtd_part_parser {
struct list_head list;
struct module *owner;
const char *name;
int (*parse_fn)(struct mtd_info *, struct mtd_partition **,
struct mtd_part_parser_data *);
+ enum mtd_parser_type type;
};
extern int register_mtd_parser(struct mtd_part_parser *parser);
@@ -87,4 +92,9 @@ uint64_t mtd_get_device_size(const struc
extern void __weak arch_split_mtd_part(struct mtd_info *master,
const char *name, int offset, int size);
+int parse_mtd_partitions_by_type(struct mtd_info *master,
+ enum mtd_parser_type type,
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data);
+
#endif