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78 lines
3.2 KiB
78 lines
3.2 KiB
8 years ago
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From 1eeef2d7483a7e3f8d2dd2a5b9939b3b814dc549 Mon Sep 17 00:00:00 2001
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From: Chris Packham <chris.packham@alliedtelesis.co.nz>
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Date: Fri, 9 Jun 2017 15:58:31 +1200
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Subject: [PATCH] mtd: handle partitioning on devices with 0 erasesize
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erasesize is meaningful for flash devices but for SRAM there is no
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concept of an erase block so erasesize is set to 0. When partitioning
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these devices instead of ensuring partitions fall on erasesize
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boundaries we ensure they fall on writesize boundaries.
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Helped-by: Boris Brezillon <boris.brezillon@free-electrons.com>
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Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
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Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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---
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drivers/mtd/mtdpart.c | 26 +++++++++++++++++---------
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1 file changed, 17 insertions(+), 9 deletions(-)
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -393,8 +393,12 @@ static struct mtd_part *allocate_partiti
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const struct mtd_partition *part, int partno,
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uint64_t cur_offset)
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{
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+ int wr_alignment = (master->flags & MTD_NO_ERASE) ? master->writesize:
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+ master->erasesize;
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struct mtd_part *slave;
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+ u32 remainder;
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char *name;
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+ u64 tmp;
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/* allocate the partition structure */
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slave = kzalloc(sizeof(*slave), GFP_KERNEL);
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@@ -499,10 +503,11 @@ static struct mtd_part *allocate_partiti
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if (slave->offset == MTDPART_OFS_APPEND)
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slave->offset = cur_offset;
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if (slave->offset == MTDPART_OFS_NXTBLK) {
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+ tmp = cur_offset;
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slave->offset = cur_offset;
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- if (mtd_mod_by_eb(cur_offset, master) != 0) {
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- /* Round up to next erasesize */
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- slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
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+ remainder = do_div(tmp, wr_alignment);
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+ if (remainder) {
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+ slave->offset += wr_alignment - remainder;
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printk(KERN_NOTICE "Moving partition %d: "
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"0x%012llx -> 0x%012llx\n", partno,
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(unsigned long long)cur_offset, (unsigned long long)slave->offset);
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@@ -567,19 +572,22 @@ static struct mtd_part *allocate_partiti
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slave->mtd.erasesize = master->erasesize;
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}
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- if ((slave->mtd.flags & MTD_WRITEABLE) &&
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- mtd_mod_by_eb(slave->offset, &slave->mtd)) {
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+ tmp = slave->offset;
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+ remainder = do_div(tmp, wr_alignment);
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+ if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
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/* Doesn't start on a boundary of major erase size */
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/* FIXME: Let it be writable if it is on a boundary of
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* _minor_ erase size though */
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slave->mtd.flags &= ~MTD_WRITEABLE;
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- printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
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+ printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
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part->name);
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}
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- if ((slave->mtd.flags & MTD_WRITEABLE) &&
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- mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
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+
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+ tmp = slave->mtd.size;
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+ remainder = do_div(tmp, wr_alignment);
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+ if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
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slave->mtd.flags &= ~MTD_WRITEABLE;
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- printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
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+ printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
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part->name);
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}
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