kernel: backport upstream mtdpart.c cleanups

Except for renames and line changes the only conflict was in
allocate_partition in handling MTD_WRITEABLE. Hopefully it was handled
correctly.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

15 files changed, 1094 insertions, 54 deletions

diff --git a/target/linux/generic/patches-4.9/064-v4.11-0001-mtd-introduce-function-max_bad_blocks.patch b/target/linux/generic/patches-4.9/064-v4.11-0001-mtd-introduce-function-max_bad_blocks.patch
new file mode 100644
index 0000000..d2e582e
--- /dev/null
+++ b/target/linux/generic/patches-4.9/064-v4.11-0001-mtd-introduce-function-max_bad_blocks.patch
@@ -0,0 +1,73 @@
+From 6080ef6e7c0a0592cbcca11200d879faf65e27d4 Mon Sep 17 00:00:00 2001
+From: Jeff Westfahl <jeff.westfahl@ni.com>
+Date: Tue, 10 Jan 2017 13:30:17 -0600
+Subject: [PATCH] mtd: introduce function max_bad_blocks
+
+If implemented, 'max_bad_blocks' returns the maximum number of bad
+blocks to reserve for a MTD. An implementation for NAND is coming soon.
+
+Signed-off-by: Jeff Westfahl <jeff.westfahl@ni.com>
+Signed-off-by: Zach Brown <zach.brown@ni.com>
+Acked-by: Boris Brezillon <boris.brezillon@free-electron.com>
+Acked-by: Brian Norris <computersforpeace@gmail.com>
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+---
+ drivers/mtd/mtdpart.c   | 10 ++++++++++
+ include/linux/mtd/mtd.h | 13 +++++++++++++
+ 2 files changed, 23 insertions(+)
+
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -349,6 +349,14 @@ static const struct mtd_ooblayout_ops pa
+ 	.free = part_ooblayout_free,
+ };
+ 
++static int part_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len)
++{
++	struct mtd_part *part = mtd_to_part(mtd);
++
++	return part->master->_max_bad_blocks(part->master,
++					     ofs + part->offset, len);
++}
++
+ static inline void free_partition(struct mtd_part *p)
+ {
+ 	kfree(p->mtd.name);
+@@ -475,6 +483,8 @@ static struct mtd_part *allocate_partiti
+ 		slave->mtd._block_isbad = part_block_isbad;
+ 	if (master->_block_markbad)
+ 		slave->mtd._block_markbad = part_block_markbad;
++	if (master->_max_bad_blocks)
++		slave->mtd._max_bad_blocks = part_max_bad_blocks;
+ 
+ 	if (master->_get_device)
+ 		slave->mtd._get_device = part_get_device;
+--- a/include/linux/mtd/mtd.h
++++ b/include/linux/mtd/mtd.h
+@@ -322,6 +322,7 @@ struct mtd_info {
+ 	int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs);
+ 	int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs);
+ 	int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
++	int (*_max_bad_blocks) (struct mtd_info *mtd, loff_t ofs, size_t len);
+ 	int (*_suspend) (struct mtd_info *mtd);
+ 	void (*_resume) (struct mtd_info *mtd);
+ 	void (*_reboot) (struct mtd_info *mtd);
+@@ -397,6 +398,18 @@ static inline int mtd_oobavail(struct mt
+ 	return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize;
+ }
+ 
++static inline int mtd_max_bad_blocks(struct mtd_info *mtd,
++				     loff_t ofs, size_t len)
++{
++	if (!mtd->_max_bad_blocks)
++		return -ENOTSUPP;
++
++	if (mtd->size < (len + ofs) || ofs < 0)
++		return -EINVAL;
++
++	return mtd->_max_bad_blocks(mtd, ofs, len);
++}
++
+ int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit,
+ 			      struct mtd_pairing_info *info);
+ int mtd_pairing_info_to_wunit(struct mtd_info *mtd,
diff --git a/target/linux/generic/patches-4.9/064-v4.11-0002-mtd-Add-partition-device-node-to-mtd-partition-devic.patch b/target/linux/generic/patches-4.9/064-v4.11-0002-mtd-Add-partition-device-node-to-mtd-partition-devic.patch
new file mode 100644
index 0000000..ea68fc4
--- /dev/null
+++ b/target/linux/generic/patches-4.9/064-v4.11-0002-mtd-Add-partition-device-node-to-mtd-partition-devic.patch
@@ -0,0 +1,50 @@
+From 42e9401bd1467d22c4dc4d2c637347b874e6a80b Mon Sep 17 00:00:00 2001
+From: Sascha Hauer <s.hauer@pengutronix.de>
+Date: Thu, 9 Feb 2017 11:50:24 +0100
+Subject: [PATCH] mtd: Add partition device node to mtd partition devices
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+The user visible change here is that mtd partitions get an of_node link
+in sysfs.
+
+Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
+Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+---
+ drivers/mtd/mtdpart.c          | 1 +
+ drivers/mtd/ofpart.c           | 1 +
+ include/linux/mtd/partitions.h | 1 +
+ 3 files changed, 3 insertions(+)
+
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -432,6 +432,7 @@ static struct mtd_part *allocate_partiti
+ 	slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) ?
+ 				&master->dev :
+ 				master->dev.parent;
++	slave->mtd.dev.of_node = part->of_node;
+ 
+ 	slave->mtd._read = part_read;
+ 	slave->mtd._write = part_write;
+--- a/drivers/mtd/ofpart.c
++++ b/drivers/mtd/ofpart.c
+@@ -108,6 +108,7 @@ static int parse_ofpart_partitions(struc
+ 
+ 		parts[i].offset = of_read_number(reg, a_cells);
+ 		parts[i].size = of_read_number(reg + a_cells, s_cells);
++		parts[i].of_node = pp;
+ 
+ 		partname = of_get_property(pp, "label", &len);
+ 		if (!partname)
+--- a/include/linux/mtd/partitions.h
++++ b/include/linux/mtd/partitions.h
+@@ -41,6 +41,7 @@ struct mtd_partition {
+ 	uint64_t size;			/* partition size */
+ 	uint64_t offset;		/* offset within the master MTD space */
+ 	uint32_t mask_flags;		/* master MTD flags to mask out for this partition */
++	struct device_node *of_node;
+ };
+ 
+ #define MTDPART_OFS_RETAIN	(-3)
diff --git a/target/linux/generic/patches-4.9/065-v4.13-0001-mtd-handle-partitioning-on-devices-with-0-erasesize.patch b/target/linux/generic/patches-4.9/065-v4.13-0001-mtd-handle-partitioning-on-devices-with-0-erasesize.patch
new file mode 100644
index 0000000..d912811
--- /dev/null
+++ b/target/linux/generic/patches-4.9/065-v4.13-0001-mtd-handle-partitioning-on-devices-with-0-erasesize.patch
@@ -0,0 +1,77 @@
+From 1eeef2d7483a7e3f8d2dd2a5b9939b3b814dc549 Mon Sep 17 00:00:00 2001
+From: Chris Packham <chris.packham@alliedtelesis.co.nz>
+Date: Fri, 9 Jun 2017 15:58:31 +1200
+Subject: [PATCH] mtd: handle partitioning on devices with 0 erasesize
+
+erasesize is meaningful for flash devices but for SRAM there is no
+concept of an erase block so erasesize is set to 0. When partitioning
+these devices instead of ensuring partitions fall on erasesize
+boundaries we ensure they fall on writesize boundaries.
+
+Helped-by: Boris Brezillon <boris.brezillon@free-electrons.com>
+Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
+Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+---
+ drivers/mtd/mtdpart.c | 26 +++++++++++++++++---------
+ 1 file changed, 17 insertions(+), 9 deletions(-)
+
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -393,8 +393,12 @@ static struct mtd_part *allocate_partiti
+ 			const struct mtd_partition *part, int partno,
+ 			uint64_t cur_offset)
+ {
++	int wr_alignment = (master->flags & MTD_NO_ERASE) ? master->writesize:
++							    master->erasesize;
+ 	struct mtd_part *slave;
++	u32 remainder;
+ 	char *name;
++	u64 tmp;
+ 
+ 	/* allocate the partition structure */
+ 	slave = kzalloc(sizeof(*slave), GFP_KERNEL);
+@@ -499,10 +503,11 @@ static struct mtd_part *allocate_partiti
+ 	if (slave->offset == MTDPART_OFS_APPEND)
+ 		slave->offset = cur_offset;
+ 	if (slave->offset == MTDPART_OFS_NXTBLK) {
++		tmp = cur_offset;
+ 		slave->offset = cur_offset;
+-		if (mtd_mod_by_eb(cur_offset, master) != 0) {
+-			/* Round up to next erasesize */
+-			slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
++		remainder = do_div(tmp, wr_alignment);
++		if (remainder) {
++			slave->offset += wr_alignment - remainder;
+ 			printk(KERN_NOTICE "Moving partition %d: "
+ 			       "0x%012llx -> 0x%012llx\n", partno,
+ 			       (unsigned long long)cur_offset, (unsigned long long)slave->offset);
+@@ -567,19 +572,22 @@ static struct mtd_part *allocate_partiti
+ 		slave->mtd.erasesize = master->erasesize;
+ 	}
+ 
+-	if ((slave->mtd.flags & MTD_WRITEABLE) &&
+-	    mtd_mod_by_eb(slave->offset, &slave->mtd)) {
++	tmp = slave->offset;
++	remainder = do_div(tmp, wr_alignment);
++	if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
+ 		/* Doesn't start on a boundary of major erase size */
+ 		/* FIXME: Let it be writable if it is on a boundary of
+ 		 * _minor_ erase size though */
+ 		slave->mtd.flags &= ~MTD_WRITEABLE;
+-		printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
++		printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
+ 			part->name);
+ 	}
+-	if ((slave->mtd.flags & MTD_WRITEABLE) &&
+-	    mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
++
++	tmp = slave->mtd.size;
++	remainder = do_div(tmp, wr_alignment);
++	if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
+ 		slave->mtd.flags &= ~MTD_WRITEABLE;
+-		printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
++		printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
+ 			part->name);
+ 	}
+ 
diff --git a/target/linux/generic/patches-4.9/065-v4.13-0002-mtd-partitions-factor-out-code-calling-parser.patch b/target/linux/generic/patches-4.9/065-v4.13-0002-mtd-partitions-factor-out-code-calling-parser.patch
new file mode 100644
index 0000000..d312e08
--- /dev/null
+++ b/target/linux/generic/patches-4.9/065-v4.13-0002-mtd-partitions-factor-out-code-calling-parser.patch
@@ -0,0 +1,68 @@
+From 01f9c7240a900d5676a8496496f2974dd36996b1 Mon Sep 17 00:00:00 2001
+From: Brian Norris <computersforpeace@gmail.com>
+Date: Tue, 23 May 2017 07:30:20 +0200
+Subject: [PATCH] mtd: partitions: factor out code calling parser
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This code is going to be reused for parsers matched using OF so let's
+factor it out to make this easier.
+
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Acked-by: Brian Norris <computersforpeace@gmail.com>
+---
+ drivers/mtd/mtdpart.c | 33 ++++++++++++++++++++++++---------
+ 1 file changed, 24 insertions(+), 9 deletions(-)
+
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -807,6 +807,27 @@ static const char * const default_mtd_pa
+ 	NULL
+ };
+ 
++static int mtd_part_do_parse(struct mtd_part_parser *parser,
++			     struct mtd_info *master,
++			     struct mtd_partitions *pparts,
++			     struct mtd_part_parser_data *data)
++{
++	int ret;
++
++	ret = (*parser->parse_fn)(master, &pparts->parts, data);
++	pr_debug("%s: parser %s: %i\n", master->name, parser->name, ret);
++	if (ret <= 0)
++		return ret;
++
++	pr_notice("%d %s partitions found on MTD device %s\n", ret,
++		  parser->name, master->name);
++
++	pparts->nr_parts = ret;
++	pparts->parser = parser;
++
++	return ret;
++}
++
+ /**
+  * parse_mtd_partitions - parse MTD partitions
+  * @master: the master partition (describes whole MTD device)
+@@ -847,16 +868,10 @@ int parse_mtd_partitions(struct mtd_info
+ 			 parser ? parser->name : NULL);
+ 		if (!parser)
+ 			continue;
+-		ret = (*parser->parse_fn)(master, &pparts->parts, data);
+-		pr_debug("%s: parser %s: %i\n",
+-			 master->name, parser->name, ret);
+-		if (ret > 0) {
+-			printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
+-			       ret, parser->name, master->name);
+-			pparts->nr_parts = ret;
+-			pparts->parser = parser;
++		ret = mtd_part_do_parse(parser, master, pparts, data);
++		/* Found partitions! */
++		if (ret > 0)
+ 			return 0;
+-		}
+ 		mtd_part_parser_put(parser);
+ 		/*
+ 		 * Stash the first error we see; only report it if no parser
diff --git a/target/linux/generic/patches-4.9/065-v4.13-0003-mtd-partitions-add-helper-for-deleting-partition.patch b/target/linux/generic/patches-4.9/065-v4.13-0003-mtd-partitions-add-helper-for-deleting-partition.patch
new file mode 100644
index 0000000..d93f4ba
--- /dev/null
+++ b/target/linux/generic/patches-4.9/065-v4.13-0003-mtd-partitions-add-helper-for-deleting-partition.patch
@@ -0,0 +1,119 @@
+From 08263a9ae664b24fa777d20b365601534842b236 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Wed, 21 Jun 2017 08:26:42 +0200
+Subject: [PATCH] mtd: partitions: add helper for deleting partition
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+There are two similar functions handling deletion. One handles single
+partition and another the whole MTD flash device. They share (duplicate)
+some code so it makes sense to add a small helper for that part.
+
+Function del_mtd_partitions has been moved a bit to keep all deleting
+stuff together.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+---
+ drivers/mtd/mtdpart.c | 75 +++++++++++++++++++++++++++++----------------------
+ 1 file changed, 43 insertions(+), 32 deletions(-)
+
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -363,32 +363,6 @@ static inline void free_partition(struct
+ 	kfree(p);
+ }
+ 
+-/*
+- * This function unregisters and destroy all slave MTD objects which are
+- * attached to the given master MTD object.
+- */
+-
+-int del_mtd_partitions(struct mtd_info *master)
+-{
+-	struct mtd_part *slave, *next;
+-	int ret, err = 0;
+-
+-	mutex_lock(&mtd_partitions_mutex);
+-	list_for_each_entry_safe(slave, next, &mtd_partitions, list)
+-		if (slave->master == master) {
+-			ret = del_mtd_device(&slave->mtd);
+-			if (ret < 0) {
+-				err = ret;
+-				continue;
+-			}
+-			list_del(&slave->list);
+-			free_partition(slave);
+-		}
+-	mutex_unlock(&mtd_partitions_mutex);
+-
+-	return err;
+-}
+-
+ static struct mtd_part *allocate_partition(struct mtd_info *master,
+ 			const struct mtd_partition *part, int partno,
+ 			uint64_t cur_offset)
+@@ -675,6 +649,48 @@ int mtd_add_partition(struct mtd_info *m
+ }
+ EXPORT_SYMBOL_GPL(mtd_add_partition);
+ 
++/**
++ * __mtd_del_partition - delete MTD partition
++ *
++ * @priv: internal MTD struct for partition to be deleted
++ *
++ * This function must be called with the partitions mutex locked.
++ */
++static int __mtd_del_partition(struct mtd_part *priv)
++{
++	int err;
++
++	err = del_mtd_device(&priv->mtd);
++	if (err)
++		return err;
++
++	list_del(&priv->list);
++	free_partition(priv);
++
++	return 0;
++}
++
++/*
++ * This function unregisters and destroy all slave MTD objects which are
++ * attached to the given master MTD object.
++ */
++int del_mtd_partitions(struct mtd_info *master)
++{
++	struct mtd_part *slave, *next;
++	int ret, err = 0;
++
++	mutex_lock(&mtd_partitions_mutex);
++	list_for_each_entry_safe(slave, next, &mtd_partitions, list)
++		if (slave->master == master) {
++			ret = __mtd_del_partition(slave);
++			if (ret < 0)
++				err = ret;
++		}
++	mutex_unlock(&mtd_partitions_mutex);
++
++	return err;
++}
++
+ int mtd_del_partition(struct mtd_info *master, int partno)
+ {
+ 	struct mtd_part *slave, *next;
+@@ -686,12 +702,7 @@ int mtd_del_partition(struct mtd_info *m
+ 		    (slave->mtd.index == partno)) {
+ 			sysfs_remove_files(&slave->mtd.dev.kobj,
+ 					   mtd_partition_attrs);
+-			ret = del_mtd_device(&slave->mtd);
+-			if (ret < 0)
+-				break;
+-
+-			list_del(&slave->list);
+-			free_partition(slave);
++			ret = __mtd_del_partition(slave);
+ 			break;
+ 		}
+ 	mutex_unlock(&mtd_partitions_mutex);
diff --git a/target/linux/generic/patches-4.9/065-v4.13-0004-mtd-partitions-remove-sysfs-files-when-deleting-all-.patch b/target/linux/generic/patches-4.9/065-v4.13-0004-mtd-partitions-remove-sysfs-files-when-deleting-all-.patch
new file mode 100644
index 0000000..0f1b502
--- /dev/null
+++ b/target/linux/generic/patches-4.9/065-v4.13-0004-mtd-partitions-remove-sysfs-files-when-deleting-all-.patch
@@ -0,0 +1,45 @@
+From c5ceaba74083daf619bdb34d4871e297a177eebf Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Wed, 21 Jun 2017 08:26:43 +0200
+Subject: [PATCH] mtd: partitions: remove sysfs files when deleting all
+ master's partitions
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+When support for sysfs "offset" file was added it missed to update the
+del_mtd_partitions function. It deletes partitions just like
+mtd_del_partition does so both should also take care of removing sysfs
+files.
+
+This change moves sysfs_remove_files call to the shared function to fix
+this issue.
+
+Fixes: a62c24d755291 ("mtd: part: Add sysfs variable for offset of partition")
+Cc: Dan Ehrenberg <dehrenberg@chromium.org>
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+---
+ drivers/mtd/mtdpart.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -660,6 +660,8 @@ static int __mtd_del_partition(struct mt
+ {
+ 	int err;
+ 
++	sysfs_remove_files(&priv->mtd.dev.kobj, mtd_partition_attrs);
++
+ 	err = del_mtd_device(&priv->mtd);
+ 	if (err)
+ 		return err;
+@@ -700,8 +702,6 @@ int mtd_del_partition(struct mtd_info *m
+ 	list_for_each_entry_safe(slave, next, &mtd_partitions, list)
+ 		if ((slave->master == master) &&
+ 		    (slave->mtd.index == partno)) {
+-			sysfs_remove_files(&slave->mtd.dev.kobj,
+-					   mtd_partition_attrs);
+ 			ret = __mtd_del_partition(slave);
+ 			break;
+ 		}
diff --git a/target/linux/generic/patches-4.9/065-v4.13-0005-mtd-partitions-rename-master-to-the-parent-where-app.patch b/target/linux/generic/patches-4.9/065-v4.13-0005-mtd-partitions-rename-master-to-the-parent-where-app.patch
new file mode 100644
index 0000000..7951227
--- /dev/null
+++ b/target/linux/generic/patches-4.9/065-v4.13-0005-mtd-partitions-rename-master-to-the-parent-where-app.patch
@@ -0,0 +1,606 @@
+From 0a9d72b69da6d8dae1abd7990c6c4c749846ef3e Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Wed, 21 Jun 2017 08:26:44 +0200
+Subject: [PATCH] mtd: partitions: rename "master" to the "parent" where
+ appropriate
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This prepares mtd subsystem for the new feature: subpartitions. In some
+cases flash device partition can be a container with extra subpartitions
+(volumes).
+
+So far there was a flat structure implemented. One master (flash device)
+could be partitioned into few partitions. Every partition got its master
+and it was enough to get things running.
+
+To support subpartitions we need to store pointer to the parent for each
+partition. This is required to implement more natural tree structure and
+handle all recursion and offsets calculation.
+
+To make code consistent this patch renamed "master" to the "parent" in
+places where we can be dealing with subpartitions.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+---
+ drivers/mtd/mtdpart.c | 204 ++++++++++++++++++++++++++------------------------
+ 1 file changed, 105 insertions(+), 99 deletions(-)
+
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -37,10 +37,16 @@
+ static LIST_HEAD(mtd_partitions);
+ static DEFINE_MUTEX(mtd_partitions_mutex);
+ 
+-/* Our partition node structure */
++/**
++ * struct mtd_part - our partition node structure
++ *
++ * @mtd: struct holding partition details
++ * @parent: parent mtd - flash device or another partition
++ * @offset: partition offset relative to the *flash device*
++ */
+ struct mtd_part {
+ 	struct mtd_info mtd;
+-	struct mtd_info *master;
++	struct mtd_info *parent;
+ 	uint64_t offset;
+ 	struct list_head list;
+ };
+@@ -67,15 +73,15 @@ static int part_read(struct mtd_info *mt
+ 	struct mtd_ecc_stats stats;
+ 	int res;
+ 
+-	stats = part->master->ecc_stats;
+-	res = part->master->_read(part->master, from + part->offset, len,
++	stats = part->parent->ecc_stats;
++	res = part->parent->_read(part->parent, from + part->offset, len,
+ 				  retlen, buf);
+ 	if (unlikely(mtd_is_eccerr(res)))
+ 		mtd->ecc_stats.failed +=
+-			part->master->ecc_stats.failed - stats.failed;
++			part->parent->ecc_stats.failed - stats.failed;
+ 	else
+ 		mtd->ecc_stats.corrected +=
+-			part->master->ecc_stats.corrected - stats.corrected;
++			part->parent->ecc_stats.corrected - stats.corrected;
+ 	return res;
+ }
+ 
+@@ -84,7 +90,7 @@ static int part_point(struct mtd_info *m
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+ 
+-	return part->master->_point(part->master, from + part->offset, len,
++	return part->parent->_point(part->parent, from + part->offset, len,
+ 				    retlen, virt, phys);
+ }
+ 
+@@ -92,7 +98,7 @@ static int part_unpoint(struct mtd_info
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+ 
+-	return part->master->_unpoint(part->master, from + part->offset, len);
++	return part->parent->_unpoint(part->parent, from + part->offset, len);
+ }
+ 
+ static unsigned long part_get_unmapped_area(struct mtd_info *mtd,
+@@ -103,7 +109,7 @@ static unsigned long part_get_unmapped_a
+ 	struct mtd_part *part = mtd_to_part(mtd);
+ 
+ 	offset += part->offset;
+-	return part->master->_get_unmapped_area(part->master, len, offset,
++	return part->parent->_get_unmapped_area(part->parent, len, offset,
+ 						flags);
+ }
+ 
+@@ -132,7 +138,7 @@ static int part_read_oob(struct mtd_info
+ 			return -EINVAL;
+ 	}
+ 
+-	res = part->master->_read_oob(part->master, from + part->offset, ops);
++	res = part->parent->_read_oob(part->parent, from + part->offset, ops);
+ 	if (unlikely(res)) {
+ 		if (mtd_is_bitflip(res))
+ 			mtd->ecc_stats.corrected++;
+@@ -146,7 +152,7 @@ static int part_read_user_prot_reg(struc
+ 		size_t len, size_t *retlen, u_char *buf)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_read_user_prot_reg(part->master, from, len,
++	return part->parent->_read_user_prot_reg(part->parent, from, len,
+ 						 retlen, buf);
+ }
+ 
+@@ -154,7 +160,7 @@ static int part_get_user_prot_info(struc
+ 				   size_t *retlen, struct otp_info *buf)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_get_user_prot_info(part->master, len, retlen,
++	return part->parent->_get_user_prot_info(part->parent, len, retlen,
+ 						 buf);
+ }
+ 
+@@ -162,7 +168,7 @@ static int part_read_fact_prot_reg(struc
+ 		size_t len, size_t *retlen, u_char *buf)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_read_fact_prot_reg(part->master, from, len,
++	return part->parent->_read_fact_prot_reg(part->parent, from, len,
+ 						 retlen, buf);
+ }
+ 
+@@ -170,7 +176,7 @@ static int part_get_fact_prot_info(struc
+ 				   size_t *retlen, struct otp_info *buf)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_get_fact_prot_info(part->master, len, retlen,
++	return part->parent->_get_fact_prot_info(part->parent, len, retlen,
+ 						 buf);
+ }
+ 
+@@ -178,7 +184,7 @@ static int part_write(struct mtd_info *m
+ 		size_t *retlen, const u_char *buf)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_write(part->master, to + part->offset, len,
++	return part->parent->_write(part->parent, to + part->offset, len,
+ 				    retlen, buf);
+ }
+ 
+@@ -186,7 +192,7 @@ static int part_panic_write(struct mtd_i
+ 		size_t *retlen, const u_char *buf)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_panic_write(part->master, to + part->offset, len,
++	return part->parent->_panic_write(part->parent, to + part->offset, len,
+ 					  retlen, buf);
+ }
+ 
+@@ -199,14 +205,14 @@ static int part_write_oob(struct mtd_inf
+ 		return -EINVAL;
+ 	if (ops->datbuf && to + ops->len > mtd->size)
+ 		return -EINVAL;
+-	return part->master->_write_oob(part->master, to + part->offset, ops);
++	return part->parent->_write_oob(part->parent, to + part->offset, ops);
+ }
+ 
+ static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
+ 		size_t len, size_t *retlen, u_char *buf)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_write_user_prot_reg(part->master, from, len,
++	return part->parent->_write_user_prot_reg(part->parent, from, len,
+ 						  retlen, buf);
+ }
+ 
+@@ -214,14 +220,14 @@ static int part_lock_user_prot_reg(struc
+ 		size_t len)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_lock_user_prot_reg(part->master, from, len);
++	return part->parent->_lock_user_prot_reg(part->parent, from, len);
+ }
+ 
+ static int part_writev(struct mtd_info *mtd, const struct kvec *vecs,
+ 		unsigned long count, loff_t to, size_t *retlen)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_writev(part->master, vecs, count,
++	return part->parent->_writev(part->parent, vecs, count,
+ 				     to + part->offset, retlen);
+ }
+ 
+@@ -231,7 +237,7 @@ static int part_erase(struct mtd_info *m
+ 	int ret;
+ 
+ 	instr->addr += part->offset;
+-	ret = part->master->_erase(part->master, instr);
++	ret = part->parent->_erase(part->parent, instr);
+ 	if (ret) {
+ 		if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
+ 			instr->fail_addr -= part->offset;
+@@ -257,51 +263,51 @@ EXPORT_SYMBOL_GPL(mtd_erase_callback);
+ static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_lock(part->master, ofs + part->offset, len);
++	return part->parent->_lock(part->parent, ofs + part->offset, len);
+ }
+ 
+ static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_unlock(part->master, ofs + part->offset, len);
++	return part->parent->_unlock(part->parent, ofs + part->offset, len);
+ }
+ 
+ static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_is_locked(part->master, ofs + part->offset, len);
++	return part->parent->_is_locked(part->parent, ofs + part->offset, len);
+ }
+ 
+ static void part_sync(struct mtd_info *mtd)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	part->master->_sync(part->master);
++	part->parent->_sync(part->parent);
+ }
+ 
+ static int part_suspend(struct mtd_info *mtd)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_suspend(part->master);
++	return part->parent->_suspend(part->parent);
+ }
+ 
+ static void part_resume(struct mtd_info *mtd)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	part->master->_resume(part->master);
++	part->parent->_resume(part->parent);
+ }
+ 
+ static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+ 	ofs += part->offset;
+-	return part->master->_block_isreserved(part->master, ofs);
++	return part->parent->_block_isreserved(part->parent, ofs);
+ }
+ 
+ static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+ 	ofs += part->offset;
+-	return part->master->_block_isbad(part->master, ofs);
++	return part->parent->_block_isbad(part->parent, ofs);
+ }
+ 
+ static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
+@@ -310,7 +316,7 @@ static int part_block_markbad(struct mtd
+ 	int res;
+ 
+ 	ofs += part->offset;
+-	res = part->master->_block_markbad(part->master, ofs);
++	res = part->parent->_block_markbad(part->parent, ofs);
+ 	if (!res)
+ 		mtd->ecc_stats.badblocks++;
+ 	return res;
+@@ -319,13 +325,13 @@ static int part_block_markbad(struct mtd
+ static int part_get_device(struct mtd_info *mtd)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	return part->master->_get_device(part->master);
++	return part->parent->_get_device(part->parent);
+ }
+ 
+ static void part_put_device(struct mtd_info *mtd)
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+-	part->master->_put_device(part->master);
++	part->parent->_put_device(part->parent);
+ }
+ 
+ static int part_ooblayout_ecc(struct mtd_info *mtd, int section,
+@@ -333,7 +339,7 @@ static int part_ooblayout_ecc(struct mtd
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+ 
+-	return mtd_ooblayout_ecc(part->master, section, oobregion);
++	return mtd_ooblayout_ecc(part->parent, section, oobregion);
+ }
+ 
+ static int part_ooblayout_free(struct mtd_info *mtd, int section,
+@@ -341,7 +347,7 @@ static int part_ooblayout_free(struct mt
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+ 
+-	return mtd_ooblayout_free(part->master, section, oobregion);
++	return mtd_ooblayout_free(part->parent, section, oobregion);
+ }
+ 
+ static const struct mtd_ooblayout_ops part_ooblayout_ops = {
+@@ -353,7 +359,7 @@ static int part_max_bad_blocks(struct mt
+ {
+ 	struct mtd_part *part = mtd_to_part(mtd);
+ 
+-	return part->master->_max_bad_blocks(part->master,
++	return part->parent->_max_bad_blocks(part->parent,
+ 					     ofs + part->offset, len);
+ }
+ 
+@@ -363,12 +369,12 @@ static inline void free_partition(struct
+ 	kfree(p);
+ }
+ 
+-static struct mtd_part *allocate_partition(struct mtd_info *master,
++static struct mtd_part *allocate_partition(struct mtd_info *parent,
+ 			const struct mtd_partition *part, int partno,
+ 			uint64_t cur_offset)
+ {
+-	int wr_alignment = (master->flags & MTD_NO_ERASE) ? master->writesize:
+-							    master->erasesize;
++	int wr_alignment = (parent->flags & MTD_NO_ERASE) ? parent->writesize:
++							    parent->erasesize;
+ 	struct mtd_part *slave;
+ 	u32 remainder;
+ 	char *name;
+@@ -379,25 +385,25 @@ static struct mtd_part *allocate_partiti
+ 	name = kstrdup(part->name, GFP_KERNEL);
+ 	if (!name || !slave) {
+ 		printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
+-		       master->name);
++		       parent->name);
+ 		kfree(name);
+ 		kfree(slave);
+ 		return ERR_PTR(-ENOMEM);
+ 	}
+ 
+ 	/* set up the MTD object for this partition */
+-	slave->mtd.type = master->type;
+-	slave->mtd.flags = master->flags & ~part->mask_flags;
++	slave->mtd.type = parent->type;
++	slave->mtd.flags = parent->flags & ~part->mask_flags;
+ 	slave->mtd.size = part->size;
+-	slave->mtd.writesize = master->writesize;
+-	slave->mtd.writebufsize = master->writebufsize;
+-	slave->mtd.oobsize = master->oobsize;
+-	slave->mtd.oobavail = master->oobavail;
+-	slave->mtd.subpage_sft = master->subpage_sft;
+-	slave->mtd.pairing = master->pairing;
++	slave->mtd.writesize = parent->writesize;
++	slave->mtd.writebufsize = parent->writebufsize;
++	slave->mtd.oobsize = parent->oobsize;
++	slave->mtd.oobavail = parent->oobavail;
++	slave->mtd.subpage_sft = parent->subpage_sft;
++	slave->mtd.pairing = parent->pairing;
+ 
+ 	slave->mtd.name = name;
+-	slave->mtd.owner = master->owner;
++	slave->mtd.owner = parent->owner;
+ 
+ 	/* NOTE: Historically, we didn't arrange MTDs as a tree out of
+ 	 * concern for showing the same data in multiple partitions.
+@@ -408,70 +414,70 @@ static struct mtd_part *allocate_partiti
+ 	 * distinguish between the master and the partition in sysfs.
+ 	 */
+ 	slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) ?
+-				&master->dev :
+-				master->dev.parent;
++				&parent->dev :
++				parent->dev.parent;
+ 	slave->mtd.dev.of_node = part->of_node;
+ 
+ 	slave->mtd._read = part_read;
+ 	slave->mtd._write = part_write;
+ 
+-	if (master->_panic_write)
++	if (parent->_panic_write)
+ 		slave->mtd._panic_write = part_panic_write;
+ 
+-	if (master->_point && master->_unpoint) {
++	if (parent->_point && parent->_unpoint) {
+ 		slave->mtd._point = part_point;
+ 		slave->mtd._unpoint = part_unpoint;
+ 	}
+ 
+-	if (master->_get_unmapped_area)
++	if (parent->_get_unmapped_area)
+ 		slave->mtd._get_unmapped_area = part_get_unmapped_area;
+-	if (master->_read_oob)
++	if (parent->_read_oob)
+ 		slave->mtd._read_oob = part_read_oob;
+-	if (master->_write_oob)
++	if (parent->_write_oob)
+ 		slave->mtd._write_oob = part_write_oob;
+-	if (master->_read_user_prot_reg)
++	if (parent->_read_user_prot_reg)
+ 		slave->mtd._read_user_prot_reg = part_read_user_prot_reg;
+-	if (master->_read_fact_prot_reg)
++	if (parent->_read_fact_prot_reg)
+ 		slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg;
+-	if (master->_write_user_prot_reg)
++	if (parent->_write_user_prot_reg)
+ 		slave->mtd._write_user_prot_reg = part_write_user_prot_reg;
+-	if (master->_lock_user_prot_reg)
++	if (parent->_lock_user_prot_reg)
+ 		slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg;
+-	if (master->_get_user_prot_info)
++	if (parent->_get_user_prot_info)
+ 		slave->mtd._get_user_prot_info = part_get_user_prot_info;
+-	if (master->_get_fact_prot_info)
++	if (parent->_get_fact_prot_info)
+ 		slave->mtd._get_fact_prot_info = part_get_fact_prot_info;
+-	if (master->_sync)
++	if (parent->_sync)
+ 		slave->mtd._sync = part_sync;
+-	if (!partno && !master->dev.class && master->_suspend &&
+-	    master->_resume) {
++	if (!partno && !parent->dev.class && parent->_suspend &&
++	    parent->_resume) {
+ 			slave->mtd._suspend = part_suspend;
+ 			slave->mtd._resume = part_resume;
+ 	}
+-	if (master->_writev)
++	if (parent->_writev)
+ 		slave->mtd._writev = part_writev;
+-	if (master->_lock)
++	if (parent->_lock)
+ 		slave->mtd._lock = part_lock;
+-	if (master->_unlock)
++	if (parent->_unlock)
+ 		slave->mtd._unlock = part_unlock;
+-	if (master->_is_locked)
++	if (parent->_is_locked)
+ 		slave->mtd._is_locked = part_is_locked;
+-	if (master->_block_isreserved)
++	if (parent->_block_isreserved)
+ 		slave->mtd._block_isreserved = part_block_isreserved;
+-	if (master->_block_isbad)
++	if (parent->_block_isbad)
+ 		slave->mtd._block_isbad = part_block_isbad;
+-	if (master->_block_markbad)
++	if (parent->_block_markbad)
+ 		slave->mtd._block_markbad = part_block_markbad;
+-	if (master->_max_bad_blocks)
++	if (parent->_max_bad_blocks)
+ 		slave->mtd._max_bad_blocks = part_max_bad_blocks;
+ 
+-	if (master->_get_device)
++	if (parent->_get_device)
+ 		slave->mtd._get_device = part_get_device;
+-	if (master->_put_device)
++	if (parent->_put_device)
+ 		slave->mtd._put_device = part_put_device;
+ 
+ 	slave->mtd._erase = part_erase;
+-	slave->master = master;
++	slave->parent = parent;
+ 	slave->offset = part->offset;
+ 
+ 	if (slave->offset == MTDPART_OFS_APPEND)
+@@ -489,25 +495,25 @@ static struct mtd_part *allocate_partiti
+ 	}
+ 	if (slave->offset == MTDPART_OFS_RETAIN) {
+ 		slave->offset = cur_offset;
+-		if (master->size - slave->offset >= slave->mtd.size) {
+-			slave->mtd.size = master->size - slave->offset
++		if (parent->size - slave->offset >= slave->mtd.size) {
++			slave->mtd.size = parent->size - slave->offset
+ 							- slave->mtd.size;
+ 		} else {
+ 			printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",
+-				part->name, master->size - slave->offset,
++				part->name, parent->size - slave->offset,
+ 				slave->mtd.size);
+ 			/* register to preserve ordering */
+ 			goto out_register;
+ 		}
+ 	}
+ 	if (slave->mtd.size == MTDPART_SIZ_FULL)
+-		slave->mtd.size = master->size - slave->offset;
++		slave->mtd.size = parent->size - slave->offset;
+ 
+ 	printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
+ 		(unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
+ 
+ 	/* let's do some sanity checks */
+-	if (slave->offset >= master->size) {
++	if (slave->offset >= parent->size) {
+ 		/* let's register it anyway to preserve ordering */
+ 		slave->offset = 0;
+ 		slave->mtd.size = 0;
+@@ -515,16 +521,16 @@ static struct mtd_part *allocate_partiti
+ 			part->name);
+ 		goto out_register;
+ 	}
+-	if (slave->offset + slave->mtd.size > master->size) {
+-		slave->mtd.size = master->size - slave->offset;
++	if (slave->offset + slave->mtd.size > parent->size) {
++		slave->mtd.size = parent->size - slave->offset;
+ 		printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
+-			part->name, master->name, (unsigned long long)slave->mtd.size);
++			part->name, parent->name, (unsigned long long)slave->mtd.size);
+ 	}
+-	if (master->numeraseregions > 1) {
++	if (parent->numeraseregions > 1) {
+ 		/* Deal with variable erase size stuff */
+-		int i, max = master->numeraseregions;
++		int i, max = parent->numeraseregions;
+ 		u64 end = slave->offset + slave->mtd.size;
+-		struct mtd_erase_region_info *regions = master->eraseregions;
++		struct mtd_erase_region_info *regions = parent->eraseregions;
+ 
+ 		/* Find the first erase regions which is part of this
+ 		 * partition. */
+@@ -543,7 +549,7 @@ static struct mtd_part *allocate_partiti
+ 		BUG_ON(slave->mtd.erasesize == 0);
+ 	} else {
+ 		/* Single erase size */
+-		slave->mtd.erasesize = master->erasesize;
++		slave->mtd.erasesize = parent->erasesize;
+ 	}
+ 
+ 	tmp = slave->offset;
+@@ -566,17 +572,17 @@ static struct mtd_part *allocate_partiti
+ 	}
+ 
+ 	mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops);
+-	slave->mtd.ecc_step_size = master->ecc_step_size;
+-	slave->mtd.ecc_strength = master->ecc_strength;
+-	slave->mtd.bitflip_threshold = master->bitflip_threshold;
++	slave->mtd.ecc_step_size = parent->ecc_step_size;
++	slave->mtd.ecc_strength = parent->ecc_strength;
++	slave->mtd.bitflip_threshold = parent->bitflip_threshold;
+ 
+-	if (master->_block_isbad) {
++	if (parent->_block_isbad) {
+ 		uint64_t offs = 0;
+ 
+ 		while (offs < slave->mtd.size) {
+-			if (mtd_block_isreserved(master, offs + slave->offset))
++			if (mtd_block_isreserved(parent, offs + slave->offset))
+ 				slave->mtd.ecc_stats.bbtblocks++;
+-			else if (mtd_block_isbad(master, offs + slave->offset))
++			else if (mtd_block_isbad(parent, offs + slave->offset))
+ 				slave->mtd.ecc_stats.badblocks++;
+ 			offs += slave->mtd.erasesize;
+ 		}
+@@ -610,7 +616,7 @@ static int mtd_add_partition_attrs(struc
+ 	return ret;
+ }
+ 
+-int mtd_add_partition(struct mtd_info *master, const char *name,
++int mtd_add_partition(struct mtd_info *parent, const char *name,
+ 		      long long offset, long long length)
+ {
+ 	struct mtd_partition part;
+@@ -623,7 +629,7 @@ int mtd_add_partition(struct mtd_info *m
+ 		return -EINVAL;
+ 
+ 	if (length == MTDPART_SIZ_FULL)
+-		length = master->size - offset;
++		length = parent->size - offset;
+ 
+ 	if (length <= 0)
+ 		return -EINVAL;
+@@ -633,7 +639,7 @@ int mtd_add_partition(struct mtd_info *m
+ 	part.size = length;
+ 	part.offset = offset;
+ 
+-	new = allocate_partition(master, &part, -1, offset);
++	new = allocate_partition(parent, &part, -1, offset);
+ 	if (IS_ERR(new))
+ 		return PTR_ERR(new);
+ 
+@@ -683,7 +689,7 @@ int del_mtd_partitions(struct mtd_info *
+ 
+ 	mutex_lock(&mtd_partitions_mutex);
+ 	list_for_each_entry_safe(slave, next, &mtd_partitions, list)
+-		if (slave->master == master) {
++		if (slave->parent == master) {
+ 			ret = __mtd_del_partition(slave);
+ 			if (ret < 0)
+ 				err = ret;
+@@ -700,7 +706,7 @@ int mtd_del_partition(struct mtd_info *m
+ 
+ 	mutex_lock(&mtd_partitions_mutex);
+ 	list_for_each_entry_safe(slave, next, &mtd_partitions, list)
+-		if ((slave->master == master) &&
++		if ((slave->parent == master) &&
+ 		    (slave->mtd.index == partno)) {
+ 			ret = __mtd_del_partition(slave);
+ 			break;
+@@ -933,6 +939,6 @@ uint64_t mtd_get_device_size(const struc
+ 	if (!mtd_is_partition(mtd))
+ 		return mtd->size;
+ 
+-	return mtd_to_part(mtd)->master->size;
++	return mtd_to_part(mtd)->parent->size;
+ }
+ EXPORT_SYMBOL_GPL(mtd_get_device_size);
diff --git a/target/linux/generic/patches-4.9/160-mtd-part-add-generic-parsing-of-linux-part-probe.patch b/target/linux/generic/patches-4.9/160-mtd-part-add-generic-parsing-of-linux-part-probe.patch
index 0d71743..8bca58a 100644
--- a/target/linux/generic/patches-4.9/160-mtd-part-add-generic-parsing-of-linux-part-probe.patch
+++ b/target/linux/generic/patches-4.9/160-mtd-part-add-generic-parsing-of-linux-part-probe.patch
@@ -116,7 +116,7 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  #include <linux/err.h>
  
  #include "mtdcore.h"
-@@ -779,6 +780,42 @@ void deregister_mtd_parser(struct mtd_pa
+@@ -815,6 +816,42 @@ void deregister_mtd_parser(struct mtd_pa
  EXPORT_SYMBOL_GPL(deregister_mtd_parser);
  
  /*
@@ -159,7 +159,7 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
   * Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you
   * are changing this array!
   */
-@@ -815,6 +852,13 @@ int parse_mtd_partitions(struct mtd_info
+@@ -872,6 +909,13 @@ int parse_mtd_partitions(struct mtd_info
  {
  	struct mtd_part_parser *parser;
  	int ret, err = 0;
@@ -173,7 +173,7 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  
  	if (!types)
  		types = default_mtd_part_types;
-@@ -846,6 +890,7 @@ int parse_mtd_partitions(struct mtd_info
+@@ -897,6 +941,7 @@ int parse_mtd_partitions(struct mtd_info
  		if (ret < 0 && !err)
  			err = ret;
  	}
diff --git a/target/linux/generic/patches-4.9/400-mtd-add-rootfs-split-support.patch b/target/linux/generic/patches-4.9/400-mtd-add-rootfs-split-support.patch
index d6c6486..bc402a2 100644
--- a/target/linux/generic/patches-4.9/400-mtd-add-rootfs-split-support.patch
+++ b/target/linux/generic/patches-4.9/400-mtd-add-rootfs-split-support.patch
@@ -39,7 +39,7 @@
  
  /* Our partition linked list */
  static LIST_HEAD(mtd_partitions);
-@@ -46,6 +48,8 @@ struct mtd_part {
+@@ -52,6 +54,8 @@ struct mtd_part {
  	struct list_head list;
  };
  
@@ -48,15 +48,15 @@
  /*
   * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
   * the pointer to that structure.
-@@ -650,6 +654,7 @@ int mtd_add_partition(struct mtd_info *m
+@@ -649,6 +653,7 @@ int mtd_add_partition(struct mtd_info *p
  	mutex_unlock(&mtd_partitions_mutex);
  
  	add_mtd_device(&new->mtd);
-+	mtd_partition_split(master, new);
++	mtd_partition_split(parent, new);
  
  	mtd_add_partition_attrs(new);
  
-@@ -682,6 +687,35 @@ int mtd_del_partition(struct mtd_info *m
+@@ -718,6 +723,35 @@ int mtd_del_partition(struct mtd_info *m
  }
  EXPORT_SYMBOL_GPL(mtd_del_partition);
  
@@ -92,7 +92,7 @@
  /*
   * This function, given a master MTD object and a partition table, creates
   * and registers slave MTD objects which are bound to the master according to
-@@ -713,6 +747,7 @@ int add_mtd_partitions(struct mtd_info *
+@@ -749,6 +783,7 @@ int add_mtd_partitions(struct mtd_info *
  		mutex_unlock(&mtd_partitions_mutex);
  
  		add_mtd_device(&slave->mtd);
@@ -102,7 +102,7 @@
  		cur_offset = slave->offset + slave->mtd.size;
 --- a/include/linux/mtd/partitions.h
 +++ b/include/linux/mtd/partitions.h
-@@ -101,5 +101,7 @@ int mtd_add_partition(struct mtd_info *m
+@@ -102,5 +102,7 @@ int mtd_add_partition(struct mtd_info *m
  		      long long offset, long long length);
  int mtd_del_partition(struct mtd_info *master, int partno);
  uint64_t mtd_get_device_size(const struct mtd_info *mtd);
diff --git a/target/linux/generic/patches-4.9/401-mtd-add-support-for-different-partition-parser-types.patch b/target/linux/generic/patches-4.9/401-mtd-add-support-for-different-partition-parser-types.patch
index a5e1fd7..71a97a0 100644
--- a/target/linux/generic/patches-4.9/401-mtd-add-support-for-different-partition-parser-types.patch
+++ b/target/linux/generic/patches-4.9/401-mtd-add-support-for-different-partition-parser-types.patch
@@ -11,7 +11,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
 
 --- a/drivers/mtd/mtdpart.c
 +++ b/drivers/mtd/mtdpart.c
-@@ -945,6 +945,62 @@ void mtd_part_parser_cleanup(struct mtd_
+@@ -996,6 +996,62 @@ void mtd_part_parser_cleanup(struct mtd_
  	}
  }
  
@@ -76,7 +76,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  	struct mtd_part *part;
 --- a/include/linux/mtd/partitions.h
 +++ b/include/linux/mtd/partitions.h
-@@ -60,11 +60,14 @@ struct mtd_part_parser_data {
+@@ -61,11 +61,14 @@ struct mtd_part_parser_data {
  	unsigned long origin;
  };
  
@@ -92,7 +92,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  struct mtd_part_parser {
  	struct list_head list;
  	struct module *owner;
-@@ -72,6 +75,7 @@ struct mtd_part_parser {
+@@ -73,6 +76,7 @@ struct mtd_part_parser {
  	int (*parse_fn)(struct mtd_info *, const struct mtd_partition **,
  			struct mtd_part_parser_data *);
  	void (*cleanup)(const struct mtd_partition *pparts, int nr_parts);
@@ -100,7 +100,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  };
  
  /* Container for passing around a set of parsed partitions */
-@@ -104,4 +108,9 @@ uint64_t mtd_get_device_size(const struc
+@@ -105,4 +109,9 @@ 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);
  
diff --git a/target/linux/generic/patches-4.9/402-mtd-use-typed-mtd-parsers-for-rootfs-and-firmware-split.patch b/target/linux/generic/patches-4.9/402-mtd-use-typed-mtd-parsers-for-rootfs-and-firmware-split.patch
index 5bb69cf..02fb9cc 100644
--- a/target/linux/generic/patches-4.9/402-mtd-use-typed-mtd-parsers-for-rootfs-and-firmware-split.patch
+++ b/target/linux/generic/patches-4.9/402-mtd-use-typed-mtd-parsers-for-rootfs-and-firmware-split.patch
@@ -1,6 +1,6 @@
 --- a/drivers/mtd/mtdpart.c
 +++ b/drivers/mtd/mtdpart.c
-@@ -687,6 +687,36 @@ int mtd_del_partition(struct mtd_info *m
+@@ -723,6 +723,36 @@ int mtd_del_partition(struct mtd_info *m
  }
  EXPORT_SYMBOL_GPL(mtd_del_partition);
  
@@ -23,7 +23,7 @@
 +		/* adjust partition offsets */
 +		parts[i].offset += slave->offset;
 +
-+		mtd_add_partition(slave->master,
++		mtd_add_partition(slave->parent,
 +				  parts[i].name,
 +				  parts[i].offset,
 +				  parts[i].size);
@@ -37,7 +37,7 @@
  #ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
  #define SPLIT_FIRMWARE_NAME	CONFIG_MTD_SPLIT_FIRMWARE_NAME
  #else
-@@ -695,6 +725,7 @@ EXPORT_SYMBOL_GPL(mtd_del_partition);
+@@ -731,6 +761,7 @@ EXPORT_SYMBOL_GPL(mtd_del_partition);
  
  static void split_firmware(struct mtd_info *master, struct mtd_part *part)
  {
@@ -45,7 +45,7 @@
  }
  
  void __weak arch_split_mtd_part(struct mtd_info *master, const char *name,
-@@ -709,6 +740,12 @@ static void mtd_partition_split(struct m
+@@ -745,6 +776,12 @@ static void mtd_partition_split(struct m
  	if (rootfs_found)
  		return;
  
@@ -60,7 +60,7 @@
  		split_firmware(master, part);
 --- a/include/linux/mtd/partitions.h
 +++ b/include/linux/mtd/partitions.h
-@@ -66,6 +66,8 @@ struct mtd_part_parser_data {
+@@ -67,6 +67,8 @@ struct mtd_part_parser_data {
  
  enum mtd_parser_type {
  	MTD_PARSER_TYPE_DEVICE = 0,
diff --git a/target/linux/generic/patches-4.9/404-mtd-add-more-helper-functions.patch b/target/linux/generic/patches-4.9/404-mtd-add-more-helper-functions.patch
index 6ecd6a1..319a22a 100644
--- a/target/linux/generic/patches-4.9/404-mtd-add-more-helper-functions.patch
+++ b/target/linux/generic/patches-4.9/404-mtd-add-more-helper-functions.patch
@@ -1,6 +1,6 @@
 --- a/drivers/mtd/mtdpart.c
 +++ b/drivers/mtd/mtdpart.c
-@@ -717,6 +717,17 @@ run_parsers_by_type(struct mtd_part *sla
+@@ -753,6 +753,17 @@ run_parsers_by_type(struct mtd_part *sla
  	return nr_parts;
  }
  
@@ -18,7 +18,7 @@
  #ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
  #define SPLIT_FIRMWARE_NAME	CONFIG_MTD_SPLIT_FIRMWARE_NAME
  #else
-@@ -1055,6 +1066,24 @@ int mtd_is_partition(const struct mtd_in
+@@ -1106,6 +1117,24 @@ int mtd_is_partition(const struct mtd_in
  }
  EXPORT_SYMBOL_GPL(mtd_is_partition);
  
@@ -27,7 +27,7 @@
 +	if (!mtd_is_partition(mtd))
 +		return (struct mtd_info *)mtd;
 +
-+	return mtd_to_part(mtd)->master;
++	return mtd_to_part(mtd)->parent;
 +}
 +EXPORT_SYMBOL_GPL(mtdpart_get_master);
 +
@@ -45,7 +45,7 @@
  {
 --- a/include/linux/mtd/partitions.h
 +++ b/include/linux/mtd/partitions.h
-@@ -106,6 +106,8 @@ int mtd_is_partition(const struct mtd_in
+@@ -107,6 +107,8 @@ int mtd_is_partition(const struct mtd_in
  int mtd_add_partition(struct mtd_info *master, const char *name,
  		      long long offset, long long length);
  int mtd_del_partition(struct mtd_info *master, int partno);
@@ -56,7 +56,7 @@
  				       const char *name, int offset, int size);
 --- a/include/linux/mtd/mtd.h
 +++ b/include/linux/mtd/mtd.h
-@@ -472,6 +472,24 @@ static inline uint32_t mtd_mod_by_eb(uin
+@@ -485,6 +485,24 @@ static inline uint32_t mtd_mod_by_eb(uin
  	return do_div(sz, mtd->erasesize);
  }
  
diff --git a/target/linux/generic/patches-4.9/410-mtd-move-forward-declaration-of-struct-mtd_info.patch b/target/linux/generic/patches-4.9/410-mtd-move-forward-declaration-of-struct-mtd_info.patch
index d965d91..78ebbf8 100644
--- a/target/linux/generic/patches-4.9/410-mtd-move-forward-declaration-of-struct-mtd_info.patch
+++ b/target/linux/generic/patches-4.9/410-mtd-move-forward-declaration-of-struct-mtd_info.patch
@@ -8,7 +8,7 @@
  
  struct mtd_partition {
  	const char *name;		/* identifier string */
-@@ -49,7 +50,6 @@ struct mtd_partition {
+@@ -50,7 +51,6 @@ struct mtd_partition {
  #define MTDPART_SIZ_FULL	(0)
  
  
diff --git a/target/linux/generic/patches-4.9/411-mtd-partial_eraseblock_write.patch b/target/linux/generic/patches-4.9/411-mtd-partial_eraseblock_write.patch
index ced1f61..0e2d492 100644
--- a/target/linux/generic/patches-4.9/411-mtd-partial_eraseblock_write.patch
+++ b/target/linux/generic/patches-4.9/411-mtd-partial_eraseblock_write.patch
@@ -9,7 +9,7 @@
  /* Our partition linked list */
  static LIST_HEAD(mtd_partitions);
  static DEFINE_MUTEX(mtd_partitions_mutex);
-@@ -235,13 +237,61 @@ static int part_erase(struct mtd_info *m
+@@ -241,13 +243,61 @@ static int part_erase(struct mtd_info *m
  	struct mtd_part *part = mtd_to_part(mtd);
  	int ret;
  
@@ -19,33 +19,33 @@
 +		size_t readlen = 0;
 +		u64 mtd_ofs;
 +
-+		instr->erase_buf = kmalloc(part->master->erasesize, GFP_ATOMIC);
++		instr->erase_buf = kmalloc(part->parent->erasesize, GFP_ATOMIC);
 +		if (!instr->erase_buf)
 +			return -ENOMEM;
 +
 +		mtd_ofs = part->offset + instr->addr;
-+		instr->erase_buf_ofs = do_div(mtd_ofs, part->master->erasesize);
++		instr->erase_buf_ofs = do_div(mtd_ofs, part->parent->erasesize);
 +
 +		if (instr->erase_buf_ofs > 0) {
 +			instr->addr -= instr->erase_buf_ofs;
-+			ret = mtd_read(part->master,
++			ret = mtd_read(part->parent,
 +				instr->addr + part->offset,
-+				part->master->erasesize,
++				part->parent->erasesize,
 +				&readlen, instr->erase_buf);
 +
 +			instr->len += instr->erase_buf_ofs;
 +			instr->partial_start = true;
 +		} else {
 +			mtd_ofs = part->offset + part->mtd.size;
-+			instr->erase_buf_ofs = part->master->erasesize -
-+				do_div(mtd_ofs, part->master->erasesize);
++			instr->erase_buf_ofs = part->parent->erasesize -
++				do_div(mtd_ofs, part->parent->erasesize);
 +
 +			if (instr->erase_buf_ofs > 0) {
 +				instr->len += instr->erase_buf_ofs;
-+				ret = mtd_read(part->master,
++				ret = mtd_read(part->parent,
 +					part->offset + instr->addr +
-+					instr->len - part->master->erasesize,
-+					part->master->erasesize, &readlen,
++					instr->len - part->parent->erasesize,
++					part->parent->erasesize, &readlen,
 +					instr->erase_buf);
 +			} else {
 +				ret = 0;
@@ -59,7 +59,7 @@
 +	}
 +
  	instr->addr += part->offset;
- 	ret = part->master->_erase(part->master, instr);
+ 	ret = part->parent->_erase(part->parent, instr);
  	if (ret) {
  		if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
  			instr->fail_addr -= part->offset;
@@ -71,7 +71,7 @@
  	return ret;
  }
  
-@@ -249,6 +299,25 @@ void mtd_erase_callback(struct erase_inf
+@@ -255,6 +305,25 @@ void mtd_erase_callback(struct erase_inf
  {
  	if (instr->mtd->_erase == part_erase) {
  		struct mtd_part *part = mtd_to_part(instr->mtd);
@@ -79,17 +79,17 @@
 +
 +		if (instr->mtd->flags & MTD_ERASE_PARTIAL) {
 +			if (instr->partial_start) {
-+				part->master->_write(part->master,
++				part->parent->_write(part->parent,
 +					instr->addr, instr->erase_buf_ofs,
 +					&wrlen, instr->erase_buf);
 +				instr->addr += instr->erase_buf_ofs;
 +			} else {
 +				instr->len -= instr->erase_buf_ofs;
-+				part->master->_write(part->master,
++				part->parent->_write(part->parent,
 +					instr->addr + instr->len,
 +					instr->erase_buf_ofs, &wrlen,
 +					instr->erase_buf +
-+					part->master->erasesize -
++					part->parent->erasesize -
 +					instr->erase_buf_ofs);
 +			}
 +			kfree(instr->erase_buf);
@@ -97,30 +97,32 @@
  
  		if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
  			instr->fail_addr -= part->offset;
-@@ -564,17 +633,20 @@ static struct mtd_part *allocate_partiti
- 	if ((slave->mtd.flags & MTD_WRITEABLE) &&
- 	    mtd_mod_by_eb(slave->offset, &slave->mtd)) {
+@@ -561,19 +630,22 @@ static struct mtd_part *allocate_partiti
+ 	remainder = do_div(tmp, wr_alignment);
+ 	if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
  		/* Doesn't start on a boundary of major erase size */
 -		/* FIXME: Let it be writable if it is on a boundary of
 -		 * _minor_ erase size though */
 -		slave->mtd.flags &= ~MTD_WRITEABLE;
--		printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
+-		printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
 -			part->name);
 +		slave->mtd.flags |= MTD_ERASE_PARTIAL;
-+		if (((u32) slave->mtd.size) > master->erasesize)
++		if (((u32)slave->mtd.size) > parent->erasesize)
 +			slave->mtd.flags &= ~MTD_WRITEABLE;
 +		else
 +			slave->mtd.erasesize = slave->mtd.size;
  	}
- 	if ((slave->mtd.flags & MTD_WRITEABLE) &&
--	    mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
+ 
+-	tmp = slave->mtd.size;
++	tmp = slave->offset + slave->mtd.size;
+ 	remainder = do_div(tmp, wr_alignment);
+ 	if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
 -		slave->mtd.flags &= ~MTD_WRITEABLE;
--		printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
+-		printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
 -			part->name);
-+	    mtd_mod_by_eb(slave->offset + slave->mtd.size, &slave->mtd)) {
 +		slave->mtd.flags |= MTD_ERASE_PARTIAL;
 +
-+		if ((u32) slave->mtd.size > master->erasesize)
++		if ((u32)slave->mtd.size > parent->erasesize)
 +			slave->mtd.flags &= ~MTD_WRITEABLE;
 +		else
 +			slave->mtd.erasesize = slave->mtd.size;
diff --git a/target/linux/generic/patches-4.9/412-mtd-partial_eraseblock_unlock.patch b/target/linux/generic/patches-4.9/412-mtd-partial_eraseblock_unlock.patch
index e7c91c6..da4a902 100644
--- a/target/linux/generic/patches-4.9/412-mtd-partial_eraseblock_unlock.patch
+++ b/target/linux/generic/patches-4.9/412-mtd-partial_eraseblock_unlock.patch
@@ -1,20 +1,20 @@
 --- a/drivers/mtd/mtdpart.c
 +++ b/drivers/mtd/mtdpart.c
-@@ -337,7 +337,16 @@ static int part_lock(struct mtd_info *mt
+@@ -343,7 +343,16 @@ static int part_lock(struct mtd_info *mt
  static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
  {
  	struct mtd_part *part = mtd_to_part(mtd);
--	return part->master->_unlock(part->master, ofs + part->offset, len);
+-	return part->parent->_unlock(part->parent, ofs + part->offset, len);
 +
 +	ofs += part->offset;
 +
 +	if (mtd->flags & MTD_ERASE_PARTIAL) {
 +		/* round up len to next erasesize and round down offset to prev block */
-+		len = (mtd_div_by_eb(len, part->master) + 1) * part->master->erasesize;
-+		ofs &= ~(part->master->erasesize - 1);
++		len = (mtd_div_by_eb(len, part->parent) + 1) * part->parent->erasesize;
++		ofs &= ~(part->parent->erasesize - 1);
 +	}
 +
-+	return part->master->_unlock(part->master, ofs, len);
++	return part->parent->_unlock(part->parent, ofs, len);
  }
  
  static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)