kernel: add linux 4.9 support

[openwrt/openwrt.git] / target / linux / generic / patches-4.9 / 412-mtd-partial_eraseblock_unlock.patch

diff --git a/target/linux/generic/patches-4.9/412-mtd-partial_eraseblock_unlock.patch b/target/linux/generic/patches-4.9/412-mtd-partial_eraseblock_unlock.patch
new file mode 100644 (file)
index 0000000..e7c91c6
--- /dev/null
+++ b/target/linux/generic/patches-4.9/412-mtd-partial_eraseblock_unlock.patch
@@ -0,0 +1,20 @@
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -337,7 +337,16 @@ 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);
++
++      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)