netdev - Re: [PATCH net-next 3/4] igb: enable internal PPS for the i210.

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Date:	Wed, 19 Nov 2014 07:37:24 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	netdev@...r.kernel.org
Cc:	David Miller <davem@...emloft.net>, bruce.w.allan@...el.com,
	Jacob Keller <jacob.e.keller@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Matthew Vick <matthew.vick@...el.com>
Subject: Re: [PATCH net-next 3/4] igb: enable internal PPS for the i210.

On Tue, Nov 18, 2014 at 12:06:24AM +0100, Richard Cochran wrote:
> --- a/drivers/net/ethernet/intel/igb/igb_main.c
> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
> @@ -5386,8 +5386,14 @@ void igb_update_stats(struct igb_adapter *adapter,
>  static void igb_tsync_interrupt(struct igb_adapter *adapter)
>  {
>  	struct e1000_hw *hw = &adapter->hw;
> +	struct ptp_clock_event event;
>  	u32 tsicr = rd32(E1000_TSICR);
>  
> +	if (tsicr & TSINTR_SYS_WRAP) {
> +		event.type = PTP_CLOCK_PPS;
> +		ptp_clock_event(adapter->ptp_clock, &event);

This causes a BUG for the 82580. When you enable E1000_TSICR_TXTS, it
seems that TSINTR_SYS_WRAP is also automatically enabled. Because the
82580 variant has no pps device enabled, the driver then dereferences
a null pointer.

So we need to make the call to ptp_clock_event() conditional based on
whether pps is enabled. I'll fix this in V2.

> +	}
> +

Thanks,
Richard
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