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tools: kwboot: Fix kwboot_xm_sendblock() function when kwboot_tty_recv() fails

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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 <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Pali Rohár 2021-09-24 23:06:43 +02:00 committed by Stefan Roese
parent a050a862a7
commit 00a1deed1c
1 changed files with 6 additions and 3 deletions
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9
tools/kwboot.c
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@ -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);