netdev - [net 1/3] e1000e: NIC goes up and immediately goes down

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Date:	Tue,  7 Aug 2012 01:04:15 -0700
From:	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
To:	davem@...emloft.net
Cc:	Tushar Dave <tushar.n.dave@...el.com>, netdev@...r.kernel.org,
	gospo@...hat.com, sassmann@...hat.com, ffutigam@...hat.com,
	mleitner@...hat.com, stable@...r.kernel.org,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Subject: [net 1/3] e1000e: NIC goes up and immediately goes down

From: Tushar Dave <tushar.n.dave@...el.com>

Found that commit d478eb44 was a bad commit.
If the link partner is transmitting codeword (even if NULL codeword),
then the RXCW.C bit will be set so check for RXCW.CW is unnecessary.
Ref: RH BZ 840642

Reported-by: Fabio Futigami <ffutigam@...hat.com>
Signed-off-by: Tushar Dave <tushar.n.dave@...el.com>
CC: Marcelo Ricardo Leitner <mleitner@...hat.com>
CC: stable <stable@...r.kernel.org> [2.6.38+]
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
---
 drivers/net/ethernet/intel/e1000e/82571.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/82571.c b/drivers/net/ethernet/intel/e1000e/82571.c
index 0b3bade..2a4ded2 100644
--- a/drivers/net/ethernet/intel/e1000e/82571.c
+++ b/drivers/net/ethernet/intel/e1000e/82571.c
@@ -1601,10 +1601,8 @@ static s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw)
 			 * auto-negotiation in the TXCW register and disable
 			 * forced link in the Device Control register in an
 			 * attempt to auto-negotiate with our link partner.
-			 * If the partner code word is null, stop forcing
-			 * and restart auto negotiation.
 			 */
-			if ((rxcw & E1000_RXCW_C) || !(rxcw & E1000_RXCW_CW))  {
+			if (rxcw & E1000_RXCW_C) {
 				/* Enable autoneg, and unforce link up */
 				ew32(TXCW, mac->txcw);
 				ew32(CTRL, (ctrl & ~E1000_CTRL_SLU));
-- 
1.7.11.2

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