linux-kernel - [PATCH 6/7] can: ems_usb: fix {rx,tx}

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Message-ID: <20241116180301.3935879-7-dario.binacchi@amarulasolutions.com>
Date: Sat, 16 Nov 2024 19:02:35 +0100
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: linux-amarula@...rulasolutions.com,
	Dario Binacchi <dario.binacchi@...rulasolutions.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Paolo Abeni <pabeni@...hat.com>,
	Sebastian Haas <haas@...-wuensche.com>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	linux-can@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH 6/7] can: ems_usb: fix {rx,tx}_errors statistics

The ems_usb_rx_err() 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. The patch increments the
receive/transmit error counter based on the value of the ECC_DIR flag.

Fixes: 702171adeed3 ("ems_usb: Added support for EMS CPC-USB/ARM7 CAN/USB interface")
Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
---

 drivers/net/can/usb/ems_usb.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c
index 050c0b49938a..98a70a2fe189 100644
--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -361,7 +361,6 @@ static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
 
 		/* bus error interrupt */
 		dev->can.can_stats.bus_error++;
-		stats->rx_errors++;
 
 		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 
@@ -381,8 +380,12 @@ static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
 		}
 
 		/* Error occurred during transmission? */
-		if ((ecc & SJA1000_ECC_DIR) == 0)
+		if ((ecc & SJA1000_ECC_DIR) == 0) {
 			cf->data[2] |= CAN_ERR_PROT_TX;
+			stats->tx_errors++;
+		} else {
+			stats->rx_errors++;
+		}
 
 		if (dev->can.state == CAN_STATE_ERROR_WARNING ||
 		    dev->can.state == CAN_STATE_ERROR_PASSIVE) {
-- 
2.43.0