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--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -356,7 +356,14 @@ static int part_unlock(struct mtd_info *
static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = PART(mtd);
- return part->master->_unlock(part->master, ofs + part->offset, len);
+
+ ofs += part->offset;
+ if (mtd->flags & MTD_ERASE_PARTIAL) {
+ /* round up len to next erasesize and round down offset to prev block */
+ len = (mtd_div_by_eb(len, part->master) + 1) * part->master->erasesize;
+ ofs &= ~(part->master->erasesize - 1);
+ }
+ return part->master->_unlock(part->master, ofs, len);
}
static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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