5.15-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 988d4222bf9039a875a3d48f2fe35c317831ff68 ]
The m_can_handle_lec_err() function was incorrectly incrementing only the receive error counter, even in cases of bit or acknowledgment errors that occur during transmission.
Fix the issue by incrementing the appropriate counter based on the type of error.
Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support") Signed-off-by: Dario Binacchi dario.binacchi@amarulasolutions.com Link: https://patch.msgid.link/20241122221650.633981-7-dario.binacchi@amarulasolut... Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/can/m_can/m_can.c | 33 +++++++++++++++++++++++---------- 1 file changed, 23 insertions(+), 10 deletions(-)
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index abc3907feb739..a4edd7ab37eb2 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -612,47 +612,60 @@ static int m_can_handle_lec_err(struct net_device *dev, u32 timestamp = 0;
cdev->can.can_stats.bus_error++; - stats->rx_errors++;
/* propagate the error condition to the CAN stack */ skb = alloc_can_err_skb(dev, &cf); - if (unlikely(!skb)) - return 0;
/* check for 'last error code' which tells us the * type of the last error to occur on the CAN bus */ - cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; + if (likely(skb)) + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
switch (lec_type) { case LEC_STUFF_ERROR: netdev_dbg(dev, "stuff error\n"); - cf->data[2] |= CAN_ERR_PROT_STUFF; + stats->rx_errors++; + if (likely(skb)) + cf->data[2] |= CAN_ERR_PROT_STUFF; break; case LEC_FORM_ERROR: netdev_dbg(dev, "form error\n"); - cf->data[2] |= CAN_ERR_PROT_FORM; + stats->rx_errors++; + if (likely(skb)) + cf->data[2] |= CAN_ERR_PROT_FORM; break; case LEC_ACK_ERROR: netdev_dbg(dev, "ack error\n"); - cf->data[3] = CAN_ERR_PROT_LOC_ACK; + stats->tx_errors++; + if (likely(skb)) + cf->data[3] = CAN_ERR_PROT_LOC_ACK; break; case LEC_BIT1_ERROR: netdev_dbg(dev, "bit1 error\n"); - cf->data[2] |= CAN_ERR_PROT_BIT1; + stats->tx_errors++; + if (likely(skb)) + cf->data[2] |= CAN_ERR_PROT_BIT1; break; case LEC_BIT0_ERROR: netdev_dbg(dev, "bit0 error\n"); - cf->data[2] |= CAN_ERR_PROT_BIT0; + stats->tx_errors++; + if (likely(skb)) + cf->data[2] |= CAN_ERR_PROT_BIT0; break; case LEC_CRC_ERROR: netdev_dbg(dev, "CRC error\n"); - cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ; + stats->rx_errors++; + if (likely(skb)) + cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ; break; default: break; }
+ if (unlikely(!skb)) + return 0; + if (cdev->is_peripheral) timestamp = m_can_get_timestamp(cdev);