kernel: backport 2 mtd partitioning fixes

This improves handling of subpartitions.

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

target/linux/generic/backport-4.14/047-v4.21-mtd-keep-original-flags-for-every-struct-mtd_info.patch

@@ -0,0 +1,58 @@
+From 1186af457cc186c5ed01708da71b1ffbdf0a2638 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Tue, 20 Nov 2018 09:55:45 +0100
+Subject: [PATCH] mtd: keep original flags for every struct mtd_info
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+When allocating a new partition mtd subsystem runs internal tests in the
+allocate_partition(). They may result in modifying specified flags (e.g.
+dropping some /features/ like write access).
+
+Those constraints don't have to be necessary true for subpartitions. It
+may happen parent partition isn't block aligned (effectively disabling
+write access) while subpartition may fit blocks nicely. In such case all
+checks should be run again (starting with original flags value).
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
+---
+ drivers/mtd/mtdcore.c   | 2 ++
+ drivers/mtd/mtdpart.c   | 3 ++-
+ include/linux/mtd/mtd.h | 1 +
+ 3 files changed, 5 insertions(+), 1 deletion(-)
+
+--- a/drivers/mtd/mtdcore.c
++++ b/drivers/mtd/mtdcore.c
+@@ -650,6 +650,8 @@ static void mtd_set_dev_defaults(struct
+ 	} else {
+ 		pr_debug("mtd device won't show a device symlink in sysfs\n");
+ 	}
++
++	mtd->orig_flags = mtd->flags;
+ }
+ 
+ /**
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -394,7 +394,8 @@ static struct mtd_part *allocate_partiti
+ 
+ 	/* set up the MTD object for this partition */
+ 	slave->mtd.type = parent->type;
+-	slave->mtd.flags = parent->flags & ~part->mask_flags;
++	slave->mtd.flags = parent->orig_flags & ~part->mask_flags;
++	slave->mtd.orig_flags = slave->mtd.flags;
+ 	slave->mtd.size = part->size;
+ 	slave->mtd.writesize = parent->writesize;
+ 	slave->mtd.writebufsize = parent->writebufsize;
+--- a/include/linux/mtd/mtd.h
++++ b/include/linux/mtd/mtd.h
+@@ -218,6 +218,7 @@ struct mtd_debug_info {
+ struct mtd_info {
+ 	u_char type;
+ 	uint32_t flags;
++	uint32_t orig_flags; /* Flags as before running mtd checks */
+ 	uint64_t size;	 // Total size of the MTD
+ 
+ 	/* "Major" erase size for the device. Naïve users may take this

target/linux/generic/backport-4.14/048-v4.21-mtd-improve-calculating-partition-boundaries-when-ch.patch

@@ -0,0 +1,55 @@
+From 6750f61a13a0197c40e4a40739117493b15f19e8 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Tue, 20 Nov 2018 10:24:09 +0100
+Subject: [PATCH] mtd: improve calculating partition boundaries when checking
+ for alignment
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+When checking for alignment mtd should check absolute offsets. It's
+important for subpartitions as it doesn't make sense to check their
+relative addresses.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
+---
+ drivers/mtd/mtdpart.c | 13 +++++++++++--
+ 1 file changed, 11 insertions(+), 2 deletions(-)
+
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -61,6 +61,15 @@ static inline struct mtd_part *mtd_to_pa
+ 	return container_of(mtd, struct mtd_part, mtd);
+ }
+ 
++static u64 part_absolute_offset(struct mtd_info *mtd)
++{
++	struct mtd_part *part = mtd_to_part(mtd);
++
++	if (!mtd_is_partition(mtd))
++		return 0;
++
++	return part_absolute_offset(part->parent) + part->offset;
++}
+ 
+ /*
+  * MTD methods which simply translate the effective address and pass through
+@@ -562,7 +571,7 @@ static struct mtd_part *allocate_partiti
+ 	if (!(slave->mtd.flags & MTD_NO_ERASE))
+ 		wr_alignment = slave->mtd.erasesize;
+ 
+-	tmp = slave->offset;
++	tmp = part_absolute_offset(parent) + 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 */
+@@ -573,7 +582,7 @@ static struct mtd_part *allocate_partiti
+ 			part->name);
+ 	}
+ 
+-	tmp = slave->mtd.size;
++	tmp = part_absolute_offset(parent) + slave->mtd.size;
+ 	remainder = do_div(tmp, wr_alignment);
+ 	if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
+ 		slave->mtd.flags &= ~MTD_WRITEABLE;

target/linux/generic/pending-4.14/161-mtd-part-add-generic-parsing-of-linux-part-probe.patch

@@ -110,7 +110,7 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  #include <linux/err.h>
  #include <linux/of.h>
  
-@@ -834,6 +835,37 @@ void deregister_mtd_parser(struct mtd_pa
+@@ -844,6 +845,37 @@ void deregister_mtd_parser(struct mtd_pa
  }
  EXPORT_SYMBOL_GPL(deregister_mtd_parser);
  
@@ -148,7 +148,7 @@ 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!
-@@ -983,6 +1015,13 @@ int parse_mtd_partitions(struct mtd_info
+@@ -993,6 +1025,13 @@ int parse_mtd_partitions(struct mtd_info
  	struct mtd_partitions pparts = { };
  	struct mtd_part_parser *parser;
  	int ret, err = 0;
@@ -162,7 +162,7 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  
  	if (!types)
  		types = mtd_is_partition(master) ? default_subpartition_types :
-@@ -1024,6 +1063,7 @@ int parse_mtd_partitions(struct mtd_info
+@@ -1034,6 +1073,7 @@ int parse_mtd_partitions(struct mtd_info
  		if (ret < 0 && !err)
  			err = ret;
  	}

target/linux/generic/pending-4.14/400-mtd-add-rootfs-split-support.patch

@@ -60,7 +60,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  /*
   * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
   * the pointer to that structure.
-@@ -658,6 +662,7 @@ int mtd_add_partition(struct mtd_info *p
+@@ -668,6 +672,7 @@ int mtd_add_partition(struct mtd_info *p
  	mutex_unlock(&mtd_partitions_mutex);
  
  	add_mtd_device(&new->mtd);
@@ -68,7 +68,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  
  	mtd_add_partition_attrs(new);
  
-@@ -736,6 +741,29 @@ int mtd_del_partition(struct mtd_info *m
+@@ -746,6 +751,29 @@ int mtd_del_partition(struct mtd_info *m
  }
  EXPORT_SYMBOL_GPL(mtd_del_partition);
  
@@ -98,7 +98,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  /*
   * 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
-@@ -767,6 +795,7 @@ int add_mtd_partitions(struct mtd_info *
+@@ -777,6 +805,7 @@ int add_mtd_partitions(struct mtd_info *
  		mutex_unlock(&mtd_partitions_mutex);
  
  		add_mtd_device(&slave->mtd);

target/linux/generic/pending-4.14/401-mtd-add-support-for-different-partition-parser-types.patch

@@ -20,7 +20,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  
  /*
   * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
-@@ -741,6 +745,36 @@ int mtd_del_partition(struct mtd_info *m
+@@ -751,6 +755,36 @@ int mtd_del_partition(struct mtd_info *m
  }
  EXPORT_SYMBOL_GPL(mtd_del_partition);
  
@@ -57,7 +57,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  #ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
  #define SPLIT_FIRMWARE_NAME	CONFIG_MTD_SPLIT_FIRMWARE_NAME
  #else
-@@ -1112,6 +1146,61 @@ void mtd_part_parser_cleanup(struct mtd_
+@@ -1122,6 +1156,61 @@ void mtd_part_parser_cleanup(struct mtd_
  	}
  }
  

target/linux/generic/pending-4.14/402-mtd-use-typed-mtd-parsers-for-rootfs-and-firmware-split.patch

@@ -10,7 +10,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
 
 --- a/drivers/mtd/mtdpart.c
 +++ b/drivers/mtd/mtdpart.c
-@@ -783,6 +783,7 @@ run_parsers_by_type(struct mtd_part *sla
+@@ -793,6 +793,7 @@ run_parsers_by_type(struct mtd_part *sla
  
  static void split_firmware(struct mtd_info *master, struct mtd_part *part)
  {
@@ -18,7 +18,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  }
  
  static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part)
-@@ -792,6 +793,12 @@ static void mtd_partition_split(struct m
+@@ -802,6 +803,12 @@ static void mtd_partition_split(struct m
  	if (rootfs_found)
  		return;
  

target/linux/generic/pending-4.14/404-mtd-add-more-helper-functions.patch

@@ -11,7 +11,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
 
 --- a/drivers/mtd/mtdpart.c
 +++ b/drivers/mtd/mtdpart.c
-@@ -1225,6 +1225,24 @@ int mtd_is_partition(const struct mtd_in
+@@ -1235,6 +1235,24 @@ int mtd_is_partition(const struct mtd_in
  }
  EXPORT_SYMBOL_GPL(mtd_is_partition);
  
@@ -38,7 +38,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  {
 --- a/include/linux/mtd/mtd.h
 +++ b/include/linux/mtd/mtd.h
-@@ -493,6 +493,24 @@ static inline uint32_t mtd_mod_by_eb(uin
+@@ -494,6 +494,24 @@ static inline uint32_t mtd_mod_by_eb(uin
  	return do_div(sz, mtd->erasesize);
  }
  

target/linux/generic/pending-4.14/411-mtd-partial_eraseblock_write.patch

@@ -19,7 +19,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  /* Our partition linked list */
  static LIST_HEAD(mtd_partitions);
  static DEFINE_MUTEX(mtd_partitions_mutex);
-@@ -246,13 +248,61 @@ static int part_erase(struct mtd_info *m
+@@ -255,13 +257,61 @@ static int part_erase(struct mtd_info *m
  	struct mtd_part *part = mtd_to_part(mtd);
  	int ret;
  
@@ -81,7 +81,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	return ret;
  }
  
-@@ -260,6 +310,25 @@ void mtd_erase_callback(struct erase_inf
+@@ -269,6 +319,25 @@ void mtd_erase_callback(struct erase_inf
  {
  	if (instr->mtd->_erase == part_erase) {
  		struct mtd_part *part = mtd_to_part(instr->mtd);
@@ -107,7 +107,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  
  		if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
  			instr->fail_addr -= part->offset;
-@@ -574,19 +643,22 @@ static struct mtd_part *allocate_partiti
+@@ -584,19 +653,22 @@ 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 */
@@ -123,8 +123,8 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
 +			slave->mtd.erasesize = slave->mtd.size;
  	}
  
--	tmp = slave->mtd.size;
+-	tmp = part_absolute_offset(parent) + slave->mtd.size;
-+	tmp = slave->offset + slave->mtd.size;
++	tmp = part_absolute_offset(parent) + slave->offset + slave->mtd.size;
  	remainder = do_div(tmp, wr_alignment);
  	if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
 -		slave->mtd.flags &= ~MTD_WRITEABLE;

target/linux/generic/pending-4.14/412-mtd-partial_eraseblock_unlock.patch

@@ -20,7 +20,7 @@ Signed-off-by: Tim Harvey <tharvey@gateworks.com>
 
 --- a/drivers/mtd/mtdpart.c
 +++ b/drivers/mtd/mtdpart.c
-@@ -348,7 +348,16 @@ static int part_lock(struct mtd_info *mt
+@@ -357,7 +357,16 @@ 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);

target/linux/generic/pending-4.14/495-mtd-core-add-get_mtd_device_by_node.patch

@@ -17,7 +17,7 @@ Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
 
 --- a/drivers/mtd/mtdcore.c
 +++ b/drivers/mtd/mtdcore.c
-@@ -922,6 +922,44 @@ out_unlock:
+@@ -924,6 +924,44 @@ out_unlock:
  }
  EXPORT_SYMBOL_GPL(get_mtd_device_nm);
  
@@ -64,7 +64,7 @@ Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
  	mutex_lock(&mtd_table_mutex);
 --- a/include/linux/mtd/mtd.h
 +++ b/include/linux/mtd/mtd.h
-@@ -579,6 +579,8 @@ extern struct mtd_info *get_mtd_device(s
+@@ -580,6 +580,8 @@ extern struct mtd_info *get_mtd_device(s
  extern int __get_mtd_device(struct mtd_info *mtd);
  extern void __put_mtd_device(struct mtd_info *mtd);
  extern struct mtd_info *get_mtd_device_nm(const char *name);