target/linux/generic/patches-4.9/412-mtd-partial_eraseblock_unlock.patch

   1 --- a/drivers/mtd/mtdpart.c
   2 +++ b/drivers/mtd/mtdpart.c
   3 @@ -337,7 +337,16 @@ static int part_lock(struct mtd_info *mt
   4  static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
   5  {
   6         struct mtd_part *part = mtd_to_part(mtd);
   7 -       return part->master->_unlock(part->master, ofs + part->offset, len);
   8 +
   9 +       ofs += part->offset;
  10 +
  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->master) + 1) * part->master->erasesize;
  14 +               ofs &= ~(part->master->erasesize - 1);
  15 +       }
  16 +
  17 +       return part->master->_unlock(part->master, ofs, len);
  18  }
  19
  20  static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)