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mctp: serial: Fix starting value for frame check sequence

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RFC1662 defines the start state for the crc16 FCS to be 0xffff, but
we're currently starting at zero.

This change uses the correct start state. We're only early in the
adoption for the serial binding, so there aren't yet any other users to
interface to.

Fixes: a0c2ccd9b5 ("mctp: Add MCTP-over-serial transport binding")
Reported-by: Harsh Tyagi <harshtya@google.com>
Tested-by: Harsh Tyagi <harshtya@google.com>
Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jeremy Kerr 2022-12-16 11:44:09 +08:00 • committed by David S. Miller
parent 1b0c84a32e
commit 2856a62762
1 changed files with 4 additions and 2 deletions
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6
drivers/net/mctp/mctp-serial.c
View file

@ -35,6 +35,8 @@
#define BYTE_FRAME 0x7e
#define BYTE_ESC 0x7d
#define FCS_INIT 0xffff
static DEFINE_IDA(mctp_serial_ida);
enum mctp_serial_state {
@ -123,7 +125,7 @@ static void mctp_serial_tx_work(struct work_struct *work)
buf[2] = dev->txlen;
if (!dev->txpos)
dev->txfcs = crc_ccitt(0, buf + 1, 2);
dev->txfcs = crc_ccitt(FCS_INIT, buf + 1, 2);
txlen = write_chunk(dev, buf + dev->txpos, 3 - dev->txpos);
if (txlen <= 0) {
@ -303,7 +305,7 @@ static void mctp_serial_push_header(struct mctp_serial *dev, unsigned char c)
case 1:
if (c == MCTP_SERIAL_VERSION) {
dev->rxpos++;
dev->rxfcs = crc_ccitt_byte(0, c);
dev->rxfcs = crc_ccitt_byte(FCS_INIT, c);
} else {
dev->rxstate = STATE_ERR;
}