[PATCH v4 12/14] dfu_mtd: Ignore non-implemented lock device failure

[Masami Hiramatsu]

Ignore the non-implemented lock device failure on writing mtd
via DFU. Without this fix, DFU write shows an error on such device
even if it succeeded, because dfu->write_medium returns -EOPNOTSUPP.

Signed-off-by: Masami Hiramatsu <masami.hirama...@linaro.org>
Cc: Lukasz Majewski <lu...@denx.de>
---
 drivers/dfu/dfu_mtd.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dfu/dfu_mtd.c b/drivers/dfu/dfu_mtd.c
index ca67585a7e..e58302c32d 100644
--- a/drivers/dfu/dfu_mtd.c
+++ b/drivers/dfu/dfu_mtd.c
@@ -152,6 +152,8 @@ static int mtd_block_op(enum dfu_op op, struct dfu_entity 
*dfu,
                ret = mtd_lock(mtd, lock_ofs, lock_len);
                if (ret && ret != -EOPNOTSUPP)
                        printf("MTD device lock failed\n");
+               if (ret == -EOPNOTSUPP)
+                       ret = 0;
        }
        return ret;
 }