netdev - [PATCH net-next 35/37] can: at91_can: at91_irq_err_line(): send error counters with state change

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Message-Id: <20231005195812.549776-36-mkl@pengutronix.de>
Date: Thu,  5 Oct 2023 21:58:10 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	kuba@...nel.org,
	linux-can@...r.kernel.org,
	kernel@...gutronix.de,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 35/37] can: at91_can: at91_irq_err_line(): send error counters with state change

Since 3e5c291c7942 ("can: add CAN_ERR_CNT flag to notify availability
of error counter") there is a dedicated flag to inform the user space,
that there are CAN error counters in the CAN error frame.

In case the device is not in bus off mode, send the error counters to
user space and set CAN_ERR_CNT.

Link: https://lore.kernel.org/all/20231005-at91_can-rx_offload-v2-25-9987d53600e0@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/at91_can.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index a413589109b2..d5e1d1b2cdd1 100644
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -884,6 +884,11 @@ static void at91_irq_err_line(struct net_device *dev, const u32 reg_sr)
 	if (unlikely(!skb))
 		return;
 
+	if (new_state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
+		cf->data[6] = bec.txerr;
+		cf->data[7] = bec.rxerr;
+	}
 
 	netif_rx(skb);
 }
-- 
2.40.1