netdev - Re: [PATCH] Fix e1000e with Intel 82572EI that has no hardware timestamp support

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Message-ID: <CAL3LdT5-pyfBTC8=sn=Nk_WEzeCJweK=NyYcOepOfESz44eOhg@mail.gmail.com>
Date:	Wed, 6 Aug 2014 23:20:27 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	"Koehrer Mathias (ETAS/ESW5)" <mathias.koehrer@...s.com>
Cc:	Richard Cochran <richardcochran@...il.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] Fix e1000e with Intel 82572EI that has no hardware
 timestamp support

On Wed, Aug 6, 2014 at 11:10 PM, Koehrer Mathias (ETAS/ESW5)
<mathias.koehrer@...s.com> wrote:
> With the Intel 82527EI (driver: e1000e) there is an issue when running
> the ptpd2 program, that leads to a kernel oops.  The reason is here that
> in e1000_xmit_frame() a work queue will be scheduled that has not been
> initialized in this case.  The work queue "tx_hwstamp_work" will only be
> initialized if adapter->flags & FLAG_HAS_HW_TIMESTAMP set.  This check
> is missing in e1000_xmit_frame().
>
> The following patch adds the missing check.
>
> Signed-off-by: Mathias Koehrer <mathias.koehrer@...s.com>
>
> ---
>  drivers/net/ethernet/intel/e1000e/netdev.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> Index: linux-3.12.26/drivers/net/ethernet/intel/e1000e/netdev.c
> ===================================================================
> --- linux-3.12.26.orig/drivers/net/ethernet/intel/e1000e/netdev.c       2014-08-04 10:56:56.000000000 +0200
> +++ linux-3.12.26/drivers/net/ethernet/intel/e1000e/netdev.c    2014-08-07 08:05:17.000000000 +0200
> @@ -5550,7 +5550,8 @@
>                              nr_frags);
>         if (count) {
>                 if (unlikely((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
> -                            !adapter->tx_hwtstamp_skb)) {
> +                            !adapter->tx_hwtstamp_skb &&
> +                            (adapter->flags & FLAG_HAS_HW_TIMESTAMP))) {
>                         skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
>                         tx_flags |= E1000_TX_FLAGS_HWTSTAMP;
>                         adapter->tx_hwtstamp_skb = skb_get(skb);
>

So is this v2 of your patch?  and you are ignoring Alex's last suggestion to do:

  unlikely(skb->tx_flags & HW_TSTAMP) &&
  (adapter->flags & HAS_HW_TSTAMP) &&
  !adapter->tx_hwtstamp_skb

Just wondering....

-- 
Cheers,
Jeff
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