6.6-stable review patch. If anyone has any objections, please let me know.
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From: Axel Forsman axfo@kvaser.com
commit 6d820b81c4dc4a4023e45c3cd6707a07dd838649 upstream.
Going bus-off on a channel doing RX could result in dropped packets.
As netif_running() gets cleared before the channel abort procedure, the handling of any last RDATA packets would see netif_rx() return non-zero to signal a dropped packet. kvaser_pciefd_read_buffer() dealt with this "error" by breaking out of processing the remaining DMA RX buffer.
Only return an error from kvaser_pciefd_read_buffer() due to packet corruption, otherwise handle it internally.
Cc: stable@vger.kernel.org Signed-off-by: Axel Forsman axfo@kvaser.com Tested-by: Jimmy Assarsson extja@kvaser.com Reviewed-by: Jimmy Assarsson extja@kvaser.com Link: https://patch.msgid.link/20250520114332.8961-4-axfo@kvaser.com Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/can/kvaser_pciefd.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
--- a/drivers/net/can/kvaser_pciefd.c +++ b/drivers/net/can/kvaser_pciefd.c @@ -1137,7 +1137,7 @@ static int kvaser_pciefd_handle_data_pac skb = alloc_canfd_skb(priv->dev, &cf); if (!skb) { priv->dev->stats.rx_dropped++; - return -ENOMEM; + return 0; }
cf->len = can_fd_dlc2len(dlc); @@ -1149,7 +1149,7 @@ static int kvaser_pciefd_handle_data_pac skb = alloc_can_skb(priv->dev, (struct can_frame **)&cf); if (!skb) { priv->dev->stats.rx_dropped++; - return -ENOMEM; + return 0; } can_frame_set_cc_len((struct can_frame *)cf, dlc, priv->ctrlmode); } @@ -1167,7 +1167,9 @@ static int kvaser_pciefd_handle_data_pac priv->dev->stats.rx_packets++; kvaser_pciefd_set_skb_timestamp(pcie, skb, p->timestamp);
- return netif_rx(skb); + netif_rx(skb); + + return 0; }
static void kvaser_pciefd_change_state(struct kvaser_pciefd_can *can,