1 --- a/drivers/mtd/mtdpart.c
2 +++ b/drivers/mtd/mtdpart.c
3 @@ -343,7 +343,16 @@ static int part_lock(struct mtd_info *mt
4 static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
6 struct mtd_part *part = mtd_to_part(mtd);
7 - return part->parent->_unlock(part->parent, ofs + part->offset, len);
11 + if (mtd->flags & MTD_ERASE_PARTIAL) {
12 + /* round up len to next erasesize and round down offset to prev block */
13 + len = (mtd_div_by_eb(len, part->parent) + 1) * part->parent->erasesize;
14 + ofs &= ~(part->parent->erasesize - 1);
17 + return part->parent->_unlock(part->parent, ofs, len);
20 static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)