6.6-stable review patch. If anyone has any objections, please let me know.
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From: Dario Binacchi dario.binacchi@amarulasolutions.com
[ Upstream commit 2c4ef3af4b028a0eaaf378df511d3b425b1df61f ]
The sja1000_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.
Increment the receive/transmit error counter based on the value of the ECC_DIR flag.
Fixes: 429da1cc841b ("can: Driver for the SJA1000 CAN controller") Signed-off-by: Dario Binacchi dario.binacchi@amarulasolutions.com Link: https://patch.msgid.link/20241122221650.633981-10-dario.binacchi@amarulasolu... Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/can/sja1000/sja1000.c | 67 ++++++++++++++++++------------- 1 file changed, 39 insertions(+), 28 deletions(-)
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c index 743c2eb62b877..10e211d917e31 100644 --- a/drivers/net/can/sja1000/sja1000.c +++ b/drivers/net/can/sja1000/sja1000.c @@ -416,8 +416,6 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) int ret = 0;
skb = alloc_can_err_skb(dev, &cf); - if (skb == NULL) - return -ENOMEM;
txerr = priv->read_reg(priv, SJA1000_TXERR); rxerr = priv->read_reg(priv, SJA1000_RXERR); @@ -425,8 +423,11 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) if (isrc & IRQ_DOI) { /* data overrun interrupt */ netdev_dbg(dev, "data overrun interrupt\n"); - cf->can_id |= CAN_ERR_CRTL; - cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; + if (skb) { + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; + } + stats->rx_over_errors++; stats->rx_errors++; sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ @@ -452,7 +453,7 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) else state = CAN_STATE_ERROR_ACTIVE; } - if (state != CAN_STATE_BUS_OFF) { + if (state != CAN_STATE_BUS_OFF && skb) { cf->can_id |= CAN_ERR_CNT; cf->data[6] = txerr; cf->data[7] = rxerr; @@ -460,33 +461,38 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) if (isrc & IRQ_BEI) { /* bus error interrupt */ priv->can.can_stats.bus_error++; - stats->rx_errors++;
ecc = priv->read_reg(priv, SJA1000_ECC); + if (skb) { + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
- cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; - - /* set error type */ - switch (ecc & ECC_MASK) { - case ECC_BIT: - cf->data[2] |= CAN_ERR_PROT_BIT; - break; - case ECC_FORM: - cf->data[2] |= CAN_ERR_PROT_FORM; - break; - case ECC_STUFF: - cf->data[2] |= CAN_ERR_PROT_STUFF; - break; - default: - break; - } + /* set error type */ + switch (ecc & ECC_MASK) { + case ECC_BIT: + cf->data[2] |= CAN_ERR_PROT_BIT; + break; + case ECC_FORM: + cf->data[2] |= CAN_ERR_PROT_FORM; + break; + case ECC_STUFF: + cf->data[2] |= CAN_ERR_PROT_STUFF; + break; + default: + break; + }
- /* set error location */ - cf->data[3] = ecc & ECC_SEG; + /* set error location */ + cf->data[3] = ecc & ECC_SEG; + }
/* Error occurred during transmission? */ - if ((ecc & ECC_DIR) == 0) - cf->data[2] |= CAN_ERR_PROT_TX; + if ((ecc & ECC_DIR) == 0) { + stats->tx_errors++; + if (skb) + cf->data[2] |= CAN_ERR_PROT_TX; + } else { + stats->rx_errors++; + } } if (isrc & IRQ_EPI) { /* error passive interrupt */ @@ -502,8 +508,10 @@ 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++; - cf->can_id |= CAN_ERR_LOSTARB; - cf->data[0] = alc & 0x1f; + if (skb) { + cf->can_id |= CAN_ERR_LOSTARB; + cf->data[0] = alc & 0x1f; + } }
if (state != priv->can.state) { @@ -516,6 +524,9 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) can_bus_off(dev); }
+ if (!skb) + return -ENOMEM; + netif_rx(skb);
return ret;