kernel: fix variable erasesize patch

Update this pending patch to remove the untested (variable eraseregions)
section, alongside simplifying the patch.

Signed-off-by: John Thomson <git@johnthomson.fastmail.com.au>
[refresh and split out unrelated refreshes]
Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>
(cherry picked from commit 4f7065ed250932d6ff725ba175e734ad4c782f14)

1 files changed, 64 insertions, 208 deletions

diff --git a/target/linux/generic/pending-5.10/402-mtd-spi-nor-write-support-for-minor-aligned-partitions.patch b/target/linux/generic/pending-5.10/402-mtd-spi-nor-write-support-for-minor-aligned-partitions.patch
index f7ebedb44e..c634ae9aeb 100644
--- a/target/linux/generic/pending-5.10/402-mtd-spi-nor-write-support-for-minor-aligned-partitions.patch
+++ b/target/linux/generic/pending-5.10/402-mtd-spi-nor-write-support-for-minor-aligned-partitions.patch
@@ -1,159 +1,10 @@
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+From cd13e2cd28bf7313b6ad6986bb8d63ea98b37a48 Mon Sep 17 00:00:00 2001
 From: John Thomson <git@johnthomson.fastmail.com.au>
-To: Miquel Raynal <miquel.raynal@bootlin.com>,
- Richard Weinberger <richard@nod.at>, Vignesh Raghavendra <vigneshr@ti.com>,
- Tudor Ambarus <tudor.ambarus@microchip.com>,
- Michael Walle <michael@walle.cc>, Pratyush Yadav <p.yadav@ti.com>,
- linux-mtd@lists.infradead.org
-Cc: linux-kernel@vger.kernel.org,
- John Thomson <git@johnthomson.fastmail.com.au>,
- kernel test robot <lkp@intel.com>, Dan Carpenter <dan.carpenter@oracle.com>
+Date: Fri, 25 Dec 2020 18:50:08 +1000
 Subject: [PATCH] mtd: spi-nor: write support for minor aligned partitions
-Date: Tue,  8 Jun 2021 14:07:19 +1000
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- Content preview:  Do not prevent writing to mtd partitions where a partition
- boundary sits on a minor erasesize boundary. This addresses a FIXME that
- has been present since the start of the linux git history: /* Doesn' [...]
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 Do not prevent writing to mtd partitions where a partition boundary sits
 on a minor erasesize boundary.
@@ -197,26 +48,65 @@ user    0m 0.00s		|0m 0.00s	|0m 0.01s
 sys     0m 46.94s		|0m 50.38s	|2m 12.46s
 
 Signed-off-by: John Thomson <git@johnthomson.fastmail.com.au>
+Signed-off-by: Thibaut VARÈNE <hacks+kernel@slashdirt.org>
+
 ---
-Have not tested on variable erase regions device.
 
 checkpatch does not like the printk(KERN_WARNING
 these should be changed separately beforehand?
 
+Changes v1 -> v2:
+Added mtdcore sysfs for erasesize_minor
+Removed finding minor erasesize for variable erase regions device,
+as untested and no responses regarding it.
+Moved IF_ENABLED for SPINOR variable erase to guard setting
+erasesize_minor in spi-nor/core.c
+Removed setting erasesize to minor where partition boundaries require
+minor erase to be writable
+Simplified minor boundary check by relying on minor being a factor of
+major
+
 Changes RFC -> v1:
 Fix uninitialized variable smatch warning
 Reported-by: kernel test robot <lkp@intel.com>
 Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
 ---
- drivers/mtd/mtdpart.c       | 52 ++++++++++++++++++++++++++++---------
- drivers/mtd/spi-nor/Kconfig | 10 +++++++
- drivers/mtd/spi-nor/core.c  | 10 +++++--
+ drivers/mtd/mtdcore.c       | 10 ++++++++++
+ drivers/mtd/mtdpart.c       | 35 +++++++++++++++++++++++++----------
+ drivers/mtd/spi-nor/Kconfig | 10 ++++++++++
+ drivers/mtd/spi-nor/core.c  | 11 +++++++++--
  include/linux/mtd/mtd.h     |  2 ++
- 4 files changed, 60 insertions(+), 14 deletions(-)
+ 5 files changed, 56 insertions(+), 12 deletions(-)
 
+--- a/drivers/mtd/mtdcore.c
++++ b/drivers/mtd/mtdcore.c
+@@ -163,6 +163,15 @@ static ssize_t mtd_erasesize_show(struct
+ }
+ static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL);
+ 
++static ssize_t mtd_erasesize_minor_show(struct device *dev,
++		struct device_attribute *attr, char *buf)
++{
++	struct mtd_info *mtd = dev_get_drvdata(dev);
++
++	return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize_minor);
++}
++static DEVICE_ATTR(erasesize_minor, S_IRUGO, mtd_erasesize_minor_show, NULL);
++
+ static ssize_t mtd_writesize_show(struct device *dev,
+ 		struct device_attribute *attr, char *buf)
+ {
+@@ -312,6 +321,7 @@ static struct attribute *mtd_attrs[] = {
+ 	&dev_attr_flags.attr,
+ 	&dev_attr_size.attr,
+ 	&dev_attr_erasesize.attr,
++	&dev_attr_erasesize_minor.attr,
+ 	&dev_attr_writesize.attr,
+ 	&dev_attr_subpagesize.attr,
+ 	&dev_attr_oobsize.attr,
 --- a/drivers/mtd/mtdpart.c
 +++ b/drivers/mtd/mtdpart.c
-@@ -40,10 +40,11 @@ static struct mtd_info *allocate_partiti
+@@ -40,6 +40,7 @@ static struct mtd_info *allocate_partiti
  	struct mtd_info *master = mtd_get_master(parent);
  	int wr_alignment = (parent->flags & MTD_NO_ERASE) ?
  			   master->writesize : master->erasesize;
@@ -224,54 +114,22 @@ Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
  	u64 parent_size = mtd_is_partition(parent) ?
  			  parent->part.size : parent->size;
  	struct mtd_info *child;
--	u32 remainder;
-+	u32 remainder, remainder_minor;
- 	char *name;
- 	u64 tmp;
- 
-@@ -145,6 +146,7 @@ static struct mtd_info *allocate_partiti
- 		int i, max = parent->numeraseregions;
- 		u64 end = child->part.offset + child->part.size;
- 		struct mtd_erase_region_info *regions = parent->eraseregions;
-+		uint32_t erasesize_minor = child->erasesize;
- 
- 		/* Find the first erase regions which is part of this
- 		 * partition. */
-@@ -155,15 +157,24 @@ static struct mtd_info *allocate_partiti
- 		if (i > 0)
- 			i--;
- 
--		/* Pick biggest erasesize */
- 		for (; i < max && regions[i].offset < end; i++) {
-+			/* Pick biggest erasesize */
- 			if (child->erasesize < regions[i].erasesize)
- 				child->erasesize = regions[i].erasesize;
-+			/* Pick smallest non-zero erasesize */
-+			if ((erasesize_minor > regions[i].erasesize) && (regions[i].erasesize > 0))
-+				erasesize_minor = regions[i].erasesize;
- 		}
-+
-+		if (erasesize_minor < child->erasesize)
-+			child->erasesize_minor = erasesize_minor;
-+
- 		BUG_ON(child->erasesize == 0);
+@@ -164,6 +165,7 @@ static struct mtd_info *allocate_partiti
  	} else {
  		/* Single erase size */
  		child->erasesize = master->erasesize;
-+		if (master->erasesize_minor)
-+			child->erasesize_minor = master->erasesize_minor;
++		child->erasesize_minor = master->erasesize_minor;
  	}
  
  	/*
-@@ -171,26 +182,43 @@ static struct mtd_info *allocate_partiti
+@@ -171,26 +173,39 @@ static struct mtd_info *allocate_partiti
  	 * exposes several regions with different erasesize. Adjust
  	 * wr_alignment accordingly.
  	 */
 -	if (!(child->flags & MTD_NO_ERASE))
 +	if (!(child->flags & MTD_NO_ERASE)) {
  		wr_alignment = child->erasesize;
-+		if (IS_ENABLED(CONFIG_MTD_SPI_NOR_USE_VARIABLE_ERASE) && child->erasesize_minor)
-+			wr_alignment_minor = child->erasesize_minor;
++		wr_alignment_minor = child->erasesize_minor;
 +	}
  
  	tmp = mtd_get_master_ofs(child, 0);
@@ -284,13 +142,11 @@ Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
 -		printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
 -			part->name);
 +		if (wr_alignment_minor) {
-+			tmp = mtd_get_master_ofs(child, 0);
-+			remainder_minor = do_div(tmp, wr_alignment_minor);
-+			if (remainder_minor == 0)
-+				child->erasesize = child->erasesize_minor;
++			/* rely on minor being a factor of major erasesize */
++			tmp = remainder;
++			remainder = do_div(tmp, wr_alignment_minor);
 +		}
-+
-+		if ((!wr_alignment_minor) || (wr_alignment_minor && remainder_minor != 0)) {
++		if (remainder) {
 +			child->flags &= ~MTD_WRITEABLE;
 +			printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
 +				part->name);
@@ -304,12 +160,11 @@ Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
 -		printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
 -			part->name);
 +		if (wr_alignment_minor) {
-+			tmp = mtd_get_master_ofs(child, 0) + child->part.size;
-+			remainder_minor = do_div(tmp, wr_alignment_minor);
-+			if (remainder_minor == 0)
-+				child->erasesize = child->erasesize_minor;
++			tmp = remainder;
++			remainder = do_div(tmp, wr_alignment_minor);
 +		}
-+		if ((!wr_alignment_minor) || (wr_alignment_minor && remainder_minor != 0)) {
++
++		if (remainder) {
 +			child->flags &= ~MTD_WRITEABLE;
 +			printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
 +				part->name);
@@ -367,11 +222,12 @@ Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
  		}
  	}
  
-@@ -2610,6 +2614,8 @@ static int spi_nor_select_erase(struct s
+@@ -2610,6 +2614,9 @@ static int spi_nor_select_erase(struct s
  		return -EINVAL;
  
  	mtd->erasesize = erase->size;
-+	if (erase_minor && erase_minor->size < erase->size)
++	if (IS_ENABLED(CONFIG_MTD_SPI_NOR_USE_VARIABLE_ERASE) &&
++			erase_minor && erase_minor->size < erase->size)
 +		mtd->erasesize_minor = erase_minor->size;
  	return 0;
  }