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From: Tim Harvey <tharvey@gateworks.com>
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Subject: mtd: allow partial block unlock
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This allows sysupgrade for devices such as the Gateworks Avila/Cambria
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product families based on the ixp4xx using the redboot bootloader with
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combined FIS directory and RedBoot config partitions on larger FLASH
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devices with larger eraseblocks.
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This second iteration of this patch addresses previous issues:
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- whitespace breakage fixed
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- unlock in all scenarios
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- simplification and fix logic bug
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[john@phrozen.org: this should be moved to the ixp4xx folder]
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Signed-off-by: Tim Harvey <tharvey@gateworks.com>
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---
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drivers/mtd/mtdpart.c | 11 ++++++++++-
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1 file changed, 10 insertions(+), 1 deletion(-)
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -292,7 +292,16 @@ static int part_lock(struct mtd_info *mt
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static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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- return part->parent->_unlock(part->parent, ofs + part->offset, len);
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+
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+ ofs += part->offset;
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+
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+ if (mtd->flags & MTD_ERASE_PARTIAL) {
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+ /* round up len to next erasesize and round down offset to prev block */
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+ len = (mtd_div_by_eb(len, part->parent) + 1) * part->parent->erasesize;
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+ ofs &= ~(part->parent->erasesize - 1);
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+ }
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+
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+ return part->parent->_unlock(part->parent, ofs, len);
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}
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static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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