linux-kernel - [PATCH v2] Fix e1000e with Intel 82572EI that has no hardware timestamp support

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Message-ID: <6714867b045641e19fd37aa9dba66957@FE-MBX1012.de.bosch.com>
Date:	Thu, 7 Aug 2014 06:34:47 +0000
From:	"Koehrer Mathias (ETAS/ESW5)" <mathias.koehrer@...s.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.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: [PATCH v2] Fix e1000e with Intel 82572EI that has no hardware
 timestamp support

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 |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

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 08:27:09.000000000 +0200
@@ -5549,8 +5549,9 @@
 	count = e1000_tx_map(tx_ring, skb, first, adapter->tx_fifo_limit,
 			     nr_frags);
 	if (count) {
-		if (unlikely((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
-			     !adapter->tx_hwtstamp_skb)) {
+		if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
+		    (adapter->flags & FLAG_HAS_HW_TIMESTAMP) &&
+		    !adapter->tx_hwtstamp_skb) {
 			skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
 			tx_flags |= E1000_TX_FLAGS_HWTSTAMP;
 			adapter->tx_hwtstamp_skb = skb_get(skb);

--