linux-kernel - [PATCH] can: c_can: fix {rx,tx}

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Message-ID: <20241014135319.2009782-1-dario.binacchi@amarulasolutions.com>
Date: Mon, 14 Oct 2024 15:53:13 +0200
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: michael@...rulasolutions.com,
	linux-amarula@...rulasolutions.com,
	Dario Binacchi <dario.binacchi@...rulasolutions.com>,
	Bhupesh Sharma <bhupesh.sharma@...com>,
	"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>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	linux-can@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH] can: c_can: fix {rx,tx}_errors statistics

The c_can_handle_bus_err() function was incorrectly incrementing only the
receive error counter, even in cases of bit or acknowledgment errors that
occur during transmission. The patch fixes the issue by incrementing the
appropriate counter based on the type of error.

Fixes: 881ff67ad450 ("can: c_can: Added support for Bosch C_CAN controller")
Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>

---

 drivers/net/can/c_can/c_can_main.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/c_can/c_can_main.c b/drivers/net/can/c_can/c_can_main.c
index c63f7fc1e691..511615dc3341 100644
--- a/drivers/net/can/c_can/c_can_main.c
+++ b/drivers/net/can/c_can/c_can_main.c
@@ -1011,7 +1011,6 @@ static int c_can_handle_bus_err(struct net_device *dev,
 
 	/* common for all type of bus errors */
 	priv->can.can_stats.bus_error++;
-	stats->rx_errors++;
 
 	/* propagate the error condition to the CAN stack */
 	skb = alloc_can_err_skb(dev, &cf);
@@ -1027,26 +1026,32 @@ static int c_can_handle_bus_err(struct net_device *dev,
 	case LEC_STUFF_ERROR:
 		netdev_dbg(dev, "stuff error\n");
 		cf->data[2] |= CAN_ERR_PROT_STUFF;
+		stats->rx_errors++;
 		break;
 	case LEC_FORM_ERROR:
 		netdev_dbg(dev, "form error\n");
 		cf->data[2] |= CAN_ERR_PROT_FORM;
+		stats->rx_errors++;
 		break;
 	case LEC_ACK_ERROR:
 		netdev_dbg(dev, "ack error\n");
 		cf->data[3] = CAN_ERR_PROT_LOC_ACK;
+		stats->tx_errors++;
 		break;
 	case LEC_BIT1_ERROR:
 		netdev_dbg(dev, "bit1 error\n");
 		cf->data[2] |= CAN_ERR_PROT_BIT1;
+		stats->tx_errors++;
 		break;
 	case LEC_BIT0_ERROR:
 		netdev_dbg(dev, "bit0 error\n");
 		cf->data[2] |= CAN_ERR_PROT_BIT0;
+		stats->tx_errors++;
 		break;
 	case LEC_CRC_ERROR:
 		netdev_dbg(dev, "CRC error\n");
 		cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
+		stats->rx_errors++;
 		break;
 	default:
 		break;
-- 
2.43.0