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-rw-r--r--target/linux/generic/patches-3.3/478-mtd-partial_eraseblock_unlock.patch18
1 files changed, 18 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.3/478-mtd-partial_eraseblock_unlock.patch b/target/linux/generic/patches-3.3/478-mtd-partial_eraseblock_unlock.patch
new file mode 100644
index 0000000000..de4481a93a
--- /dev/null
+++ b/target/linux/generic/patches-3.3/478-mtd-partial_eraseblock_unlock.patch
@@ -0,0 +1,18 @@
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -356,7 +356,14 @@ static int part_unlock(struct mtd_info *
+ struct mtd_part *part = PART(mtd);
+ if ((len + ofs) > mtd->size)
+ return -EINVAL;
+- return mtd_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 mtd_unlock(part->master, ofs, len);
+ }
+
+ static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)