From: Gabor Juhos <juhosg@openwrt.org>
Subject: kernel/3.10: allow to use partition parsers for rootfs and firmware split

lede-commit: 3b71cd94bc9517bc25267dccb393b07d4b54564e
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
---
 drivers/mtd/mtdpart.c          | 37 +++++++++++++++++++++++++++++++++++++
 include/linux/mtd/partitions.h |  2 ++
 2 files changed, 39 insertions(+)

--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -744,6 +744,36 @@ int mtd_del_partition(struct mtd_info *m
 }
 EXPORT_SYMBOL_GPL(mtd_del_partition);
 
+static int
+run_parsers_by_type(struct mtd_part *slave, enum mtd_parser_type type)
+{
+	struct mtd_partition *parts;
+	int nr_parts;
+	int i;
+
+	nr_parts = parse_mtd_partitions_by_type(&slave->mtd, type, (const struct mtd_partition **)&parts,
+						NULL);
+	if (nr_parts <= 0)
+		return nr_parts;
+
+	if (WARN_ON(!parts))
+		return 0;
+
+	for (i = 0; i < nr_parts; i++) {
+		/* adjust partition offsets */
+		parts[i].offset += slave->offset;
+
+		mtd_add_partition(slave->parent,
+				  parts[i].name,
+				  parts[i].offset,
+				  parts[i].size);
+	}
+
+	kfree(parts);
+
+	return nr_parts;
+}
+
 #ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
 #define SPLIT_FIRMWARE_NAME	CONFIG_MTD_SPLIT_FIRMWARE_NAME
 #else
@@ -752,6 +782,7 @@ EXPORT_SYMBOL_GPL(mtd_del_partition);
 
 static void split_firmware(struct mtd_info *master, struct mtd_part *part)
 {
+	run_parsers_by_type(part, MTD_PARSER_TYPE_FIRMWARE);
 }
 
 void __weak arch_split_mtd_part(struct mtd_info *master, const char *name,
@@ -766,6 +797,12 @@ static void mtd_partition_split(struct m
 	if (rootfs_found)
 		return;
 
+	if (!strcmp(part->mtd.name, "rootfs")) {
+		run_parsers_by_type(part, MTD_PARSER_TYPE_ROOTFS);
+
+		rootfs_found = 1;
+	}
+
 	if (!strcmp(part->mtd.name, SPLIT_FIRMWARE_NAME) &&
 	    IS_ENABLED(CONFIG_MTD_SPLIT_FIRMWARE))
 		split_firmware(master, part);
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -74,6 +74,8 @@ struct mtd_part_parser_data {
 
 enum mtd_parser_type {
 	MTD_PARSER_TYPE_DEVICE = 0,
+	MTD_PARSER_TYPE_ROOTFS,
+	MTD_PARSER_TYPE_FIRMWARE,
 };
 
 struct mtd_part_parser {