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 --- drivers/net/can/kvaser_pciefd.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/kvaser_pciefd.c b/drivers/net/can/kvaser_pciefd.c index 6251a1ddfa7e..1f4004204fa8 100644 --- a/drivers/net/can/kvaser_pciefd.c +++ b/drivers/net/can/kvaser_pciefd.c @@ -1216,7 +1216,7 @@ static int kvaser_pciefd_handle_data_packet(struct kvaser_pciefd *pcie, skb = alloc_canfd_skb(priv->dev, &cf); if (!skb) { priv->dev->stats.rx_dropped++; - return -ENOMEM; + return 0; }

cf->len = can_fd_dlc2len(dlc); @@ -1228,7 +1228,7 @@ static int kvaser_pciefd_handle_data_packet(struct kvaser_pciefd *pcie, 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); } @@ -1246,7 +1246,9 @@ static int kvaser_pciefd_handle_data_packet(struct kvaser_pciefd *pcie, 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,