From: Pali Rohár <p...@kernel.org>
When kwboot_tty_recv() fails or times out, it does not set the `c`
variable to NAK. The variable is then compared, while it holds either
an undefined value or a value from previous iteration. Set `c` to NAK so
that the other side will try to resend current block, and remove the
now unnecessary break.
In other failure cases return immediately.
Signed-off-by: Pali Rohár <p...@kernel.org>
Reviewed-by: Marek Behún <marek.be...@nic.cz>
---
tools/kwboot.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/tools/kwboot.c b/tools/kwboot.c
index 454339db14..b9a402ca91 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -380,12 +380,15 @@ kwboot_xm_sendblock(int fd, struct kwboot_block *block)
do {
rc = kwboot_tty_send(fd, block, sizeof(*block));
if (rc)
- break;
+ return rc;
do {
rc = kwboot_tty_recv(fd, &c, 1, blk_rsp_timeo);
- if (rc)
- break;
+ if (rc) {
+ if (errno != ETIMEDOUT)
+ return rc;
+ c = NAK;
+ }
if (c != ACK && c != NAK && c != CAN)
printf("%c", c);
--
2.32.0
