On Sun, 7 Mar 2021 10:20:08 +0100
"Ahmed S. Darwish" <a.darw...@linutronix.de> wrote:
> @Erhard, can you please try below patch? Just want to confirm if this
> theory has any validity to it:
>
> diff --git a/drivers/net/ethernet/realtek/8139too.c
> b/drivers/net/ethernet/realtek/8139too.c
> index 1e5a453dea14..c0dbb0418e9d 100644
> --- a/drivers/net/ethernet/realtek/8139too.c
> +++ b/drivers/net/ethernet/realtek/8139too.c
> @@ -715,6 +715,11 @@ static const unsigned int rtl8139_rx_config =
> static const unsigned int rtl8139_tx_config =
> TxIFG96 | (TX_DMA_BURST << TxDMAShift) | (TX_RETRY << TxRetryShift);
>
> +#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
> +static struct lock_class_key rx_stats_key;
> +static struct lock_class_key tx_stats_key;
> +#endif
> +
> static void __rtl8139_cleanup_dev (struct net_device *dev)
> {
> struct rtl8139_private *tp = netdev_priv(dev);
> @@ -794,8 +799,17 @@ static struct net_device *rtl8139_init_board(struct
> pci_dev *pdev)
>
> pci_set_master (pdev);
>
> - u64_stats_init(&tp->rx_stats.syncp);
> - u64_stats_init(&tp->tx_stats.syncp);
> +#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
> + dev_warn(d, "Manually intializing tx/rx stats sequence counters\n");
> +
> + tp->rx_stats.syncp.seq.sequence = 0;
> + lockdep_set_class_and_name(&tp->rx_stats.syncp.seq,
> + &rx_stats_key, "RX stats");
> +
> + tp->tx_stats.syncp.seq.sequence = 0;
> + lockdep_set_class_and_name(&tp->tx_stats.syncp.seq,
> + &tx_stats_key, "TX stats");
> +#endif
Hi Ahmed!
With your patch on top of 5.12-rc2 the lockdep splat is gone in the kernel
dmesg and I only get:
[...]
8139too: 8139too Fast Ethernet driver 0.9.28
8139too 0000:00:0f.0: Manually intializing tx/rx stats sequence counters
8139too 0000:00:0f.0 eth0: RealTek RTL8139 at 0x(ptrval), 00:30:1b:2f:2c:58,
IRQ 18
[...]
Trying Peter's patch next.
