kernel/3.10: allow to use different MTD parser types

Signed-off-by: Gabor Juhos <[email protected]>

SVN-Revision: 38107

target/linux/generic/patches-3.10/401-mtd-add-support-for-different-partition-parser-types.patch

@@ -0,0 +1,113 @@
+From 02cff0ccaa6d364f5c1eeea83f47ac80ccc967d4 Mon Sep 17 00:00:00 2001
+From: Gabor Juhos <[email protected]>
+Date: Tue, 3 Sep 2013 18:11:50 +0200
+Subject: [PATCH] mtd: add support for different partition parser types
+
+Signed-off-by: Gabor Juhos <[email protected]>
+---
+ 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