diff options
Diffstat (limited to 'target/linux/generic/backport-4.9/065-v4.13-0001-mtd-handle-partitioning-on-devices-with-0-erasesize.patch')
| -rw-r--r-- | target/linux/generic/backport-4.9/065-v4.13-0001-mtd-handle-partitioning-on-devices-with-0-erasesize.patch | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.9/065-v4.13-0001-mtd-handle-partitioning-on-devices-with-0-erasesize.patch b/target/linux/generic/backport-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/backport-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); + } + |