linux-kernel - [PATCH 5.9 025/105] can: sja1000: sja1000_err(): dont count arbitration lose as an error

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Message-Id: <20201214172556.489074286@linuxfoundation.org>
Date:   Mon, 14 Dec 2020 18:27:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jeroen Hofstee <jhofstee@...tronenergy.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.9 025/105] can: sja1000: sja1000_err(): dont count arbitration lose as an error

From: Jeroen Hofstee <jhofstee@...tronenergy.com>

[ Upstream commit bd0ccb92efb09c7da5b55162b283b42a93539ed7 ]

Losing arbitration is normal in a CAN-bus network, it means that a higher
priority frame is being send and the pending message will be retried later.
Hence most driver only increment arbitration_lost, but the sja1000 driver also
incremeants tx_error, causing errors to be reported on a normal functioning
CAN-bus. So stop counting them as errors.

Fixes: 8935f57e68c4 ("can: sja1000: fix network statistics update")
Signed-off-by: Jeroen Hofstee <jhofstee@...tronenergy.com>
Link: https://lore.kernel.org/r/20201127095941.21609-1-jhofstee@victronenergy.com
[mkl: split into two seperate patches]
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/can/sja1000/sja1000.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 9f107798f904b..25a4d7d0b3498 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -474,7 +474,6 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 		netdev_dbg(dev, "arbitration lost interrupt\n");
 		alc = priv->read_reg(priv, SJA1000_ALC);
 		priv->can.can_stats.arbitration_lost++;
-		stats->tx_errors++;
 		cf->can_id |= CAN_ERR_LOSTARB;
 		cf->data[0] = alc & 0x1f;
 	}
-- 
2.27.0