[U-Boot] [RFC PATCH 05/14] dfu: allow read with 0 data for EOF indication

[Patrick Delaunay]

This patch allows into the DFU backend to indicate that there is no
remaining data (for EOF for example). That allows users to read a
buffer greater than the device size; the dfu stack stops the read
request when the backend return a length=0 without error.

Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
---

 drivers/dfu/dfu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
index 01ec690..bcfa170 100644
--- a/drivers/dfu/dfu.c
+++ b/drivers/dfu/dfu.c
@@ -395,6 +395,8 @@ static int dfu_read_buffer_fill(struct dfu_entity *dfu, void *buf, int size)
 				debug("%s: Read error!\n", __func__);
 				return ret;
 			}
+			if (dfu->b_left == 0)
+				break;
 			dfu->offset += dfu->b_left;
 			dfu->r_left -= dfu->b_left;
 
-- 
2.7.4