--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
-@@ -337,7 +337,16 @@ static int part_lock(struct mtd_info *mt
+@@ -343,7 +343,16 @@ static int part_lock(struct mtd_info *mt
static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = mtd_to_part(mtd);
-- return part->master->_unlock(part->master, ofs + part->offset, len);
+- return part->parent->_unlock(part->parent, 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);
++ len = (mtd_div_by_eb(len, part->parent) + 1) * part->parent->erasesize;
++ ofs &= ~(part->parent->erasesize - 1);
+ }
+
-+ return part->master->_unlock(part->master, ofs, len);
++ return part->parent->_unlock(part->parent, ofs, len);
}
static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)