usb: dfu: decrease dfu->r_left along with the transfer

The value of dfu->r_left need decrease along with the transfer

Signed-off-by: Bo Shen <voice.shen@atmel.com>

diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
index 6ec2a2633ca0f97e9d36ed46e590d2f5fcbdc2c7..2a514d08bc428cf74f02f583dbda3e2d4b323686 100644 (file)
--- a/drivers/dfu/dfu.c
+++ b/drivers/dfu/dfu.c
@@ -241,6 +241,7 @@ static int dfu_read_buffer_fill(struct dfu_entity *dfu, void *buf, int size)
                        dfu->crc = crc32(dfu->crc, buf, chunk);
                        dfu->i_buf += chunk;
                        dfu->b_left -= chunk;
+                       dfu->r_left -= chunk;
                        size -= chunk;
                        buf += chunk;
                        readn += chunk;