can: rcar_can: do not report txerr and rxerr during bus-off

During bus off, the error count is greater than 255 and can not fit in
a u8.

Fixes: fd1159318e55 ("can: add Renesas R-Car CAN driver")
Link: https://lore.kernel.org/all/20220719143550.3681-3-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c
index d45762f..24d7a71 100644 (file)
--- a/drivers/net/can/rcar/rcar_can.c
+++ b/drivers/net/can/rcar/rcar_can.c
@@ -232,11 +232,8 @@ static void rcar_can_error(struct net_device *ndev)
        if (eifr & (RCAR_CAN_EIFR_EWIF | RCAR_CAN_EIFR_EPIF)) {
                txerr = readb(&priv->regs->tecr);
                rxerr = readb(&priv->regs->recr);
-               if (skb) {
+               if (skb)
                        cf->can_id |= CAN_ERR_CRTL;
-                       cf->data[6] = txerr;
-                       cf->data[7] = rxerr;
-               }
        }
        if (eifr & RCAR_CAN_EIFR_BEIF) {
                int rx_errors = 0, tx_errors = 0;
@@ -336,6 +333,9 @@ static void rcar_can_error(struct net_device *ndev)
                can_bus_off(ndev);
                if (skb)
                        cf->can_id |= CAN_ERR_BUSOFF;
+       } else if (skb) {
+               cf->data[6] = txerr;
+               cf->data[7] = rxerr;
        }
        if (eifr & RCAR_CAN_EIFR_ORIF) {
                netdev_dbg(priv->ndev, "Receive overrun error interrupt\n");