6.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dario Binacchi <dario.binacchi@xxxxxxxxxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxxxxxxxxx>
Link: https://patch.msgid.link/20241122221650.633981-10-dario.binacchi@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 ddb3247948ad2..4d245857ef1ce 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;
--
2.43.0
