can: f81604: f81604_handle_can_bus_errors(): fix {rx,tx}_errors statistics

BugLink: https://bugs.launchpad.net/bugs/2102118

[ Upstream commit d7b9165 ]

The f81604_handle_can_bus_errors() function only incremented the receive
error counter and never the transmit error counter, even if the ECC_DIR
flag reported that an error had occurred during transmission.

Increment the receive/transmit error counter based on the value of the
ECC_DIR flag.

Fixes: 88da174 ("can: usb: f81604: add Fintek F81604 support")
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://patch.msgid.link/20241122221650.633981-13-dario.binacchi@amarulasolutions.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

Author: passgat

drivers/net/can/usb/f81604.c

@@ -526,7 +526,6 @@ static void f81604_handle_can_bus_errors(struct f81604_port_priv *priv,
 		netdev_dbg(netdev, "bus error interrupt\n");
 
 		priv->can.can_stats.bus_error++;
-		stats->rx_errors++;
 
 		if (skb) {
 			cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
@@ -548,10 +547,15 @@ static void f81604_handle_can_bus_errors(struct f81604_port_priv *priv,
 
 			/* set error location */
 			cf->data[3] = data->ecc & F81604_SJA1000_ECC_SEG;
+		}
 
-			/* Error occurred during transmission? */
-			if ((data->ecc & F81604_SJA1000_ECC_DIR) == 0)
+		/* Error occurred during transmission? */
+		if ((data->ecc & F81604_SJA1000_ECC_DIR) == 0) {
+			stats->tx_errors++;
+			if (skb)
 				cf->data[2] |= CAN_ERR_PROT_TX;
+		} else {
+			stats->rx_errors++;
 		}
 
 		set_bit(F81604_CLEAR_ECC, &priv->clear_flags);