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 9e66242504f49e17481d8e197730faba7d99c934 ]
Ensure that the statistics are always updated, even if the skb allocation fails.
Fixes: 4d6d26537940 ("can: c_can: fix {rx,tx}_errors statistics") Signed-off-by: Dario Binacchi dario.binacchi@amarulasolutions.com Link: https://patch.msgid.link/20241122221650.633981-2-dario.binacchi@amarulasolut... Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/can/c_can/c_can_main.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-)
diff --git a/drivers/net/can/c_can/c_can_main.c b/drivers/net/can/c_can/c_can_main.c index 511615dc33419..cc371d0c9f3c7 100644 --- a/drivers/net/can/c_can/c_can_main.c +++ b/drivers/net/can/c_can/c_can_main.c @@ -1014,49 +1014,57 @@ static int c_can_handle_bus_err(struct net_device *dev,
/* 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; + if (likely(skb)) + cf->data[2] |= CAN_ERR_PROT_STUFF; stats->rx_errors++; break; case LEC_FORM_ERROR: netdev_dbg(dev, "form error\n"); - cf->data[2] |= CAN_ERR_PROT_FORM; + if (likely(skb)) + cf->data[2] |= CAN_ERR_PROT_FORM; stats->rx_errors++; break; case LEC_ACK_ERROR: netdev_dbg(dev, "ack error\n"); - cf->data[3] = CAN_ERR_PROT_LOC_ACK; + if (likely(skb)) + cf->data[3] = CAN_ERR_PROT_LOC_ACK; stats->tx_errors++; break; case LEC_BIT1_ERROR: netdev_dbg(dev, "bit1 error\n"); - cf->data[2] |= CAN_ERR_PROT_BIT1; + if (likely(skb)) + cf->data[2] |= CAN_ERR_PROT_BIT1; stats->tx_errors++; break; case LEC_BIT0_ERROR: netdev_dbg(dev, "bit0 error\n"); - cf->data[2] |= CAN_ERR_PROT_BIT0; + if (likely(skb)) + cf->data[2] |= CAN_ERR_PROT_BIT0; stats->tx_errors++; break; case LEC_CRC_ERROR: netdev_dbg(dev, "CRC error\n"); - cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ; + if (likely(skb)) + cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ; stats->rx_errors++; break; default: break; }
+ if (unlikely(!skb)) + return 0; + netif_receive_skb(skb); return 1; }